MOLE CONCEPT

01) Statement I: In 32 g of O2 two gram atom of 1) both (A) and (R) are correct but (R) is not the correct
oxygen atom are present. explanation of (A)
Statement II: Molecular weight of O2 is 32 g 2)(A) is correct but (R) is not correct
1) Statement 1 is true, statement 2 is true,statement 3)(A) is not correct but (R) is correct
2 is correct explanation for statement 1
4)Both (A) and (R) are correct and (R) is the correct explanation
2) Statement 1 is true statement is true ,statement 2 is of (A)
NOT a correct explanation for statement 1
04) match the following prefixes with there multiple
3)Statement 1 is true,statement 2 is false
prefixes multiples
4)Statement 1 is false statement 2 is false
A p
micro 106
A p
02)Match the column 1 with column 2.
V q
deca 109
B q
prefixes multiples
C r
mega 10-6
A p C r
88g of CO2 0.25 mol
A p
D s
giga 10-15
V q D s
6.022 x 1023 molecules of h2o 2 mol
B q
E t
femto 10
C r E t
5.6 litres of O2 at STP 1 mol
C r
D s x 1023
6.022
96g of O2 (1) A-(r); B-(t);C-(p); D-(q);E-(t)
D s molecules
(1) A-(q); B-(r);C-(P); D-(t);E-(s)
E t
1 mol of any gas 3 mol (1) A-(s); B-(p);C-(r); D-(q);E-(i)
E t
(1) A-(p); B-(t);C-(s); D-(q);E-(r)

(1) A-(t); B-(q);C-(p); D-(r);E-(s) 5) given below are two statements one is labbled as
assertion(A) And the other is labbled as reason (R) :
(1) A-(q); B-(r);C-(P); D-(t);E-(s)
Assertion(A):
(1) A-(s); B-(p);C-(r); D-(q);E-(i)
6 moles of co2 will react with 2 moles of o2 to give 4 mole of co2
(1) A-(p); B-(t);C-(s); D-(q);E-(r)
Reason(R):
3) Given below are two statements : one is labelled as
assertion(A) And the other is labelled as reason (R) O2 is limiting reagent

Assertion(A): 1) both (A) and (R) are correct but (R) is not the correct
explanation of (A)
Combustion of 16 g of methane gives 18g of water.
2)(A) is correct but (R) is not correct
Reason(R):
3)(A) is not correct but (R) is correct
In the combustion of methane , water is one of the
products 4)Both (A) and (R) are correct and (R) is the correct explanation
of (A)
In the light of the above statements, choose the most
appropriate answer from the options given below: 04) match the following prefixes with there multiple
06) Given below are two statements : one is labelled as 1) Statement 1 is true, statement 2 is true,statement
assertion(A) And the other is labelled as reason (R) 2 is correct explanation for statement 1
Assertion(A): 2) Statement 1 is true statement is true ,statement 2 is
NOT a correct explanation for statement 1
Molarity changes with temperature but molalility does not
3)Statement 1 is true,statement 2 is false
Reason(R):
4)Statement 1 is false statement 2 is false
Molarity is volume based which changes with temperature
while molality is mass based which is not affected by
temperature
10) Statement I : the percentage of nitrogen is urea is
1) both (A) and (R) are correct but (R) is not the correct 46.6%.
explanation of (A)
Statement II – urea is an ionic compound
2)(A) is correct but (R) is not correct
1) Statement 1 is true, statement 2 is true,statement
3)(A) is not correct but (R) is correct 2 is correct explanation for statement 1
4)Both (A) and (R) are correct and (R) is the correct 2) Statement 1 is true statement is true ,statement 2 is
explanation of (A) NOT a correct explanation for statement 1
3)Statement 1 is true,statement 2 is false
07) Statement I: when 1 mole of NH3 and 1 mole O2 are 4)Statement 1 is false statement 2 is false
made to react , then all the NH3 may be consumed if
11) match the following prefixes with there multiple
(unbalanced) reaction is
NH3 (g) + O2 (g) → NO(g) + H2O(l) Column I Column - II
Statement II: oxygen is limiting reagent as per given A p
data 49 g H2SO4 0.5 mole
A p
1) Statement 1 is true, statement 2 is true,statement V q
2 is correct explanation for statement 1 20g NAOH 1.5 NA atoms
B q
2) Statement 1 is true statement is true ,statement 2 is
11.2
C L of CO2 AT r 0.5 NA
NOT a correct explanation for statement 1
C STP r molecules
3)Statement 1 is true,statement 2 is false
D6.023 x 1023 s2 mole of O
4)Statement 1 is false statement 2 is false D atoms of oxygen s atoms

08) Statement I : for a very dilute solution molality are (

approximately equal 1) A-(p,q,r); B-(p,s,r);C-(p,r); D-(p,q,r)

Statement IImass of solution is always approximately (1) A-(p,r); B-(p,q,r);C-(p,s); D-(p,q,r)

equal to mass of solvent for a very dilute solution (1) A-(p,q,r); B-(p,q,s);C-(p,s,r); D-(q,r)
1) Statement 1 is true, statement 2 is true,statement (1) A-(p,s,r); B-(p,r);C-(p,q,r); D-(p,r)
2 is correct explanation for statement 1
2) Statement 1 is true statement is true ,statement 2 is
NOT a correct explanation for statement 1 12) Given below are two statements : one is labelled as
assertion(A) And the other is labelled as reason (R)
3)Statement 1 is true,statement 2 is false
Assertion(A):
4)Statement 1 is false statement 2 is false
6 moles of CO2 will react with 2 moles of O2 to give 4
moles of CO2
09) Statement I : equal moles of different substances Reason(R):
contain same number of constituent particals
O2 is limiting reagent
Statement II – equal weights of different substances
contain the same number of constituents particles
 1) both (A) and (R) are correct but (R) is not the correct 15) Statement I : in 32 g of O2 two gram atom of
explanation of (A) oxygen atoms are present.
2)(A) is correct but (R) is not correct Statement II : molecular weight of O2 is 32 g
3)(A) is not correct but (R) is correct 1) Statement 1 is true, statement 2 is true,statement
2 is correct explanation for statement 1
4)Both (A) and (R) are correct and (R) is the correct
explanation of (A) 2) Statement 1 is true statement is true ,statement 2 is
NOT a correct explanation for statement 1
13) Given below are two statements : one is labelled as
assertion(A) And the other is labelled as reason (R) 3)Statement 1 is true,statement 2 is false
Assertion(A): 4)Statement 1 is false statement 2 is false
Number of moles of H2 in 0.224 L of H2 (gas) is0.01 mole
Reason(R): 16) which of the following pairs have same number of
molecules ?
22.4 L of H2 (gas) at STP contains 6.02 x 1023 moles .
A . 2g of O2 4g of SO2
B . 2g of CO2 2g of N2O
1) both (A) and (R) are correct but (R) is not the correct
explanation of (A) C . 224 ml O2 at STP 448 ml of He at 0.5 atm and 273
K
2)(A) is correct but (R) is not correct
D . 2g oxygen and 2g ozone
3)(A) is not correct but (R) is correct
4)Both (A) and (R) are correct and (R) is the correct
explanation of (A) 1) a ,b & c 2) b, c & d
3a, b ,c & d 4) a ,b, & d
14) match the following prefixes with there multiple

Column I Column - II 17) Statement I : one mole of an ideal gas have volume
of 22.4 litre at 273.15 K and 1 atm
A P
88g of CO2 0.25 mol Statement II : under identical condition , equal weight
A 1
of gases have same volume
V6.022 x 1023 Q
2 mol 1) Statement 1 is true, statement 2 is true,statement
B molecules of H2O 2 2 is correct explanation for statement 1
5.6
C litres of O2 at R 2) Statement 1 is true statement is true ,statement 2 is
1 mol
C STP 3 NOT a correct explanation for statement 1
D S6.022 x 1023 3)Statement 1 is true,statement 2 is false
96g of O2
D 4 molecules
4)Statement 1 is false statement 2 is false
D
1 mole of any gas 3 mol
E (
18) Given below are two statements : one is labelled as
assertion(A) And the other is labelled as reason (R)
1) A-2 B-3 C- D-5 E -4 Assertion(A):
(2) A-2 B-3 C-4 D-5 E-1 One atomic mass unit is defined as one twelth of mass of
(3) A-2 B-3 C-5 D-1 E- 4 one carbon 12 atom

(4) A-2 B-3 C-1 D-4 E- 5 Reason(R):

Carbon 12 isotope Is most abundant isotope of carbon has
been chosen as standerd
1) both (A) and (R) are correct but (R) is not the correct
explanation of (A)
2)(A) is correct but (R) is not correct 22) match the following prefixes with there multipl
3)(A) is not correct but (R) is correct
Column
4)Both (A) and (R) are correct and (R) is the correct Column I
- II
explanation of (A)
19) 10 g carbon reacts with 100g Cl2 to form CCL2 the Number
A of carbon atoms in 1g 0.5P
correct statement is
A molecules of CO2 1 N0

A . carbon is the limiting reagent V Q

Number of molecules in 48g O2 N0
B 2
B . CL2 is limiting reagent
Number
C of molecules in 11.2 L H2 at R
C . 107g CCL4 is formed 3N0
C STP 3
D . 0.833 moles of CCl4 is formed
Number
D of hydrogen atoms in 1mole 1.5S
D of NH3 4 N0
1) a ,b & c 2) b, c & d
3a, b ,c & d 4) a ,b, & d
(1) A-2 B-3 C-1 D-4.

20) Statement I : the mass of Mg2N2 produced as the (2) A-1 B-2 C-3 D-4
reaction Mg + NH3 →Mg3N2 + H2 if 48 gm of Mg metal (3) A-2 B-4 C-1 D-3
is reacted with 34 gm NH3 gas is 200/3 g
(4) A-2 B-1C-4 D-3
Statement II : as per the given data N2 is limiting
reagent . 23) match the following prefixes with there multiple

1) Statement 1 is true, statement 2 is true,statement Column - II

2 is correct explanation for statement 1
A p
2) Statement 1 is true statement is true ,statement 2 is NA2S2O3 30%
A p
NOT a correct explanation for statement 1
V q
3)Statement 1 is true,statement 2 is false KMnO3 39%
B q
4)Statement 1 is false statement 2 is false
C r
NA3PO4 57%
C r
21) Given below are two statements : one is labelled as D s
assertion(A) And the other is labelled as reason (R) MGCO3 40.5%
D s
Assertion(A):
A molecule of butane C2H10 has a mass of 58.12 amu
Reason(R): 1) A-3 B-2 C-4 D-1
One mole of butane contains 6.022 x 1023 (2) A-1 B-3 C-2 D-4
(3) A-2 B-4 C-3 D-1
1) both (A) and (R) are correct but (R) is not the correct (4) A-1 B-4 C-2 D-3
explanation of (A)
24)Select the incorrect statements
2)(A) is correct but (R) is not correct
1) ratio of gm litre & % w/v of solution is independent of
3)(A) is not correct but (R) is correct solute substance
4)Both (A) and (R) are correct and (R) is the correct 2) ratio of % w/v and molarity of solution depends on the
explanation of (A) solute substance
3) ratio of % w/v and molarity of solution depends in the
solvent substance
 25) Statement I : eqivalent weight of ozone on the (1) A-(p,q,s); B-(p,s,r);C-(p,r,s); D-(p,s)
change O3 →O2 is 8
(1) A-(p,s); B-(q,r,s);C-(p,s); D-(p,s)
Statement II : 1 mole of O3 on decomposition gives
(1) A-(p,s); B-(q,s);C-(p,s); D-(p,s)
3/2 moles of O2
(1) A-(q,s); B-(q,r,s);C-(p,s); D-(p,s)
1) Statement 1 is true, statement 2 is true,statement
2 is correct explanation for statement 1
2) Statement 1 is true statement is true ,statement 2 is 29Rearrange the following in the order of increasing
NOT a correct explanation for statement 1 mass?
3)Statement 1 is true,statement 2 is false A . 6.02x1023 molecules of SO2
4)Statement 1 is false statement 2 is false B . 18 ml of water at 4°C
26) Given below are two statements : one is labelled as C . 11200 ml of CH4 at STP
assertion(A) And the other is labelled as reason (R)
D . 5.6 litre of CO2 at STP
Assertion(A):
For calculating the molarity or the mole fraction of solute
if the molarity is known it is nessessary to know the 1) a < d < c < b 1) a < b<c < d
density of the solution
Reason(R): 1) a < c < d < b 2)c < d < b < a
Molality molarity and the mole fraction of solute can be
calculated from the weight percentage and density of the
solution 30) Assertion(A):

1) both (A) and (R) are correct but (R) is not the correct One molal aqueous solution of glucose contains 180g of
explanation of (A) glucose in 1kg of water

2)(A) is correct but (R) is not correct Reason(R):

3)(A) is not correct but (R) is correct A solution containing one mole of solute is 1000g
solvent is called one molal solution
4)Both (A) and (R) are correct and (R) is the correct
explanation of (A) 1) both (A) and (R) are correct but (R) is not the correct
explanation of (A)
27)equal masses of SO2 and O2 are placed in flask at
STP choose the incorrect statement 2)(A) is correct but (R) is not correct

1) the number of molecules of O2 is more than SO2 3)(A) is not correct but (R) is correct

2) volume occupied at STP is more for O2 than SO2 4)Both (A) and (R) are correct and (R) is the correct
explanation of (A)
3) the ratio of the number of atoms of SO2 & O2 is 3:4
4) moles of SO2 is greater than the moles of O2
31) Assertion(A):
28) match the following prefixes with there multiple
One mole of sulphuric acid contains 32 g each of
Column I Column - II sulphur and oxygen element

A p6.02x1023 Reason(R):
1 mol of Na
A p
1 mole of sulphuric acid represents 98g of species
V q
Atomic weight 1) both (A) and (R) are correct but (R) is not the correct
1 mole of H2O
B q in gram explanation of (A)
C r0.molecular 2)(A) is correct but (R) is not correct
1 mole of NH3
C r weight in gram
3)(A) is not correct but (R) is correct
No
D of molecules sAvagadro’s
4)Both (A) and (R) are correct and (R) is the correct
D in 16g CH4 s number
explanation of (A)
 2)(A) is correct but (R) is not correct
Q32. The incorrect statement among the following is 3)(A) is not correct but (R) is correct
1) a molecule of a compound has atoms of different 4)Both (A) and (R) are correct and (R) is the correct
elements explanation of (A)
2) a compound can not be separated into its constituet 36) one of the statements of dalton’s atomic theory is
elements by the physical method of separation given below:
3)a compound retains the physical properties of its “Compounds are formed when atoms of different
constituents elements elements combine in a fixed ratio “
4) the ratio of atoms of different elements in a compound Which of the following laws is not related to the
is fixed statement ?
33) (a) law of conservation of mass
Assertion(A): b) law of definite proportions
The empirical mass of ethene is half of its molecular c) law of multiple proportions
mass
d) Avogadro law
Reason(R):
1. a,d
The empirical formula represents the simplest whole
2 . b,c
number ratio of various atoms present in a compound
3 . c,d
1) both (A) and (R) are correct but (R) is not the correct
explanation of (A) 4 . b,d
2)(A) is correct but (R) is not correct 37)
3)(A) is not correct but (R) is correct Assertion(A):
4)Both (A) and (R) are correct and (R) is the correct Relative atomic mass is always measured in kilo grams
explanation of (A)
Reason(R):
34)
Atomic weight is also known as relative atomic mass
Assertion(A):
1) both (A) and (R) are correct but (R) is not the correct
Significant figures for α200 is 3 whereas for 200 it is 1 explanation of (A)
Reason(R): 2)(A) is correct but (R) is not correct
Zero at the end or right of a number are significant 3)(A) is not correct but (R) is correct
provided they are not on the right side of the decimal
point 4)Both (A) and (R) are correct and (R) is the correct
explanation of (A)
1) both (A) and (R) are correct but (R) is not the correct
explanation of (A) 38) match the following prefixes with there multiple

2)(A) is correct but (R) is not correct

Column I Column - II
3)(A) is not correct but (R) is correct
A p 0.25 mol
88g of CO2
4)Both (A) and (R) are correct and (R) is the correct A p
explanation of (A)
6.022 x 10 23
35) V
molecules of H2O q
2 mol
B q
Assertion(A):HCL molecule is example of
heteroatomic molecules
C r
Reason(R): 5.6 L of O2 at STP 3 mol
C r
CO is example of monoatomic molecule.
D s
96g of O2 1 mol
1) both (A) and (R) are correct but (R) is not the correct D s
explanation of (A)
Codes : 4)Both (A) and (R) are correct and (R) is the correct
explanation of (A)
A B C D
42)
1 2 4 1 3
Assertion(A):
2 1 2 3 4
Molecular formula gives formation about number of
3 1 4 3 2 atoms present in molecules
4 1 3 2 4 Reason(R):
Molecular formula of blue vitrol is CuSO4 5H2O
39) one mole of oxygen gas at STP is equal to :
1) both (A) and (R) are correct but (R) is not the correct
explanation of (A)

a) 6.022 x 10 23 molecules of oxygen 2)(A) is correct but (R) is not correct

b) 6.022 x 1023 atoms of oxygen 3)(A) is not correct but (R) is correct

c) 16 g of oxygen molecules 4)Both (A) and (R) are correct and (R) is the correct
explanation of (A)
d) 32 g of oxygen

43) the incorrect statement among the following is :

1) a & b
1) the molecule of a compound has atoms of different
2)a & c elements
3) a & d 2) a compound can not be separated into its constituent
4) c & d elements by the physical method of seperation
3) a compound retains the physical properties of its
constituent elements
40) which of the following pairs have the same number
of atoms : 4)the ratio of atoms of different elements in compound is
fixed
a) 16 g of O2 and 4g of H2O
44)
b) 16 g of O2 and 44 g CO2
Assertion(A):
C) 28 g of N2 and 32 g of O2
The number of molecules in 2 moles of NH3 is equal to
D) 12 g of C and 23 g of Na the number of molecules im 4 moles of CH4
1) a & b Reason(R):
2)b & c Both are chemically similar species
3) b & d 1) both (A) and (R) are correct but (R) is not the correct
explanation of (A)
4) c & d
2)(A) is correct but (R) is not correct
41)
3)(A) is not correct but (R) is correct
Assertion(A):
4)Both (A) and (R) are correct and (R) is the correct
The molar volume of gas is equal to 22.4 Cm3
explanation of (A)
Reason(R):
45)
The relative molecular mass of gas is twice its vapour
Assertion(A):
density
Atomic mass is expressed in atomic mass unit (a.m.u)
1) both (A) and (R) are correct but (R) is not the correct
explanation of (A) Reason(R):
2)(A) is correct but (R) is not correct Atomic mass unit is defined as 1/12 the mass of carbon
atom c -12
3)(A) is not correct but (R) is correct
1) both (A) and (R) are correct but (R) is not the correct
explanation of (A)
2)(A) is correct but (R) is not correct
49) match the column I & II
3)(A) is not correct but (R) is correct
4)Both (A) and (R) are correct and (R) is the correct Column I Column - II
explanation of (A)
32gm
A each of O2 and 2pmoles of Fe
46) A S p
Assertion(A):
2 gram molecule of
One mole of gas is equal to 22.4 litre at STP V q
3 moles of ozone
K3[Fe(CN)6]
B q molecule
Reason(R):
Mass of one atom is equal to atomic number per
atomic mass number 144
C gm of oxygen r
1mole
C atom r
1) both (A) and (R) are correct but (R) is not the correct
explanation of (A) From 168 g of iron
6.023
D 1023 atoms of s moles of
12
2)(A) is correct but (R) is not correct D iron are removed the s carbon atoms
3)(A) is not correct but (R) is correct iron left

4)Both (A) and (R) are correct and (R) is the correct
explanation of (A)
(1) A-r B-p,s C-q D-p

47) Statement I : equivalent of K2Cr2O2 has 1 (2) A-q B-r C-p,s D-s
equivalent of K Cr and O each (3) A-s B-p C-r D-q,r
Statement II – A species contains same number of (4) A-p,q B-r C-s D-q
eqivalents of its components
50)
1) Statement 1 is true, statement 2 is true,statement
2 is correct explanation for statement 1 Assertion(A):

2) Statement 1 is true statement is true ,statement 2 is 1 mole of any gas occupies 22.4 lit at NTP
NOT a correct explanation for statement 1
Reason(R):
3)Statement 1 is true,statement 2 is false
In 1502 cm, zero is significant
4)Statement 1 is false statement 2 is false
1) both (A) and (R) are correct but (R) is not the correct
48) which of the following is correct ? explanation of (A)

1) the sum of mole fractions of all the components in a 2)(A) is correct but (R) is not correct
solution is always unity
3)(A) is not correct but (R) is correct
2) mole fraction depends upon teampreture
4)Both (A) and (R) are correct and (R) is the correct
3)mole fraction is always negative explanation of (A)

4)mole fraction is independent of the content of solute in

the solution
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