(PDF) Chemistry IJSO Stage-1 - Compress
(PDF) Chemistry IJSO Stage-1 - Compress
(PDF) Chemistry IJSO Stage-1 - Compress
12. When milk of lime is reacted with sulphur, the oxidation state of sulphur changes from zero to -
(A) –2/5 (B) –2/5 and +2 (C) +2 (D) +2 and +4
IJSO STAGE-I
DAILY PRACTICE PROBLEMS
SESSION-2012-13
SUBJECT : CHEMISTRY DPP : 02
1. What volume of a solution of hydrochloric acid containing 73g of acid per litre would sufficient for the exact
neutralization of sodium hydroxide obtained by allowing 0.46 g of metallic sodium to act upon water ?
(A) 20 m (B) 15 m (C) 10 m (D) 25 m
2. What volume of 0.1 M H2SO4 must be added to 50 ml of a 0.1 M NaOH solution to make a solution in
which the molarity of the H2SO4 is 0.050 M ?
(A) 400 m (B) 50 ml (C)100 m (D) 150 m
3. The density (in g m–1) of a 3.60 M sulphuric acid solution that is 29% by mass will be -
(A) 1.22 (B) 1.45 (C) 1.64 (D) 1.88
4. 2g sample containing Na2CO3 and NaHCO3 loses 0.248 g when heated to 300ºC, the temperature at
which NaHCO3 decomposes to Na2CO3 and H2O. What is the % of Na2CO3 in the mixture ?
(A) 33.6% (B) 67.4% (C) 67.2% (D) 32.8%
6. 300 ml of 3M NaCl is added to 200 ml of 4M BaCl2 solution. The concentration of Cl– ions in the resulting
solution is -
(A) 7 M (B) 1.6 M (C) 1.8 M (D) 5 M
7. The volume of water to be added to 100 cm3 of 0.5 N H2SO4 to get deci normal concentration is :
(A) 100 cm3 (B) 450 cm3 (C) 500 cm3 (D) 400 cm3
9. Which of the following will released hydrogen when reacts with sodium ?
(A) HCl (B) C2H5OH (C) C2H2 (D) All of these
10. pH of a solution prepared by mixing 25 ml of 0.05 M solution of HCl, 10 mL of 0.5 NaOH, 50 mL of 0.05 M
solution of H2SO4 and 15 ml of water will be -
(A) 12.903 (B) 1.903 (C) 12.097 (D) 1.097
11. The pH of a solution of 0.1 M CH3COOH increases when which of the following substance is added ?
(A) NaHSO4 (B) HClO4 (C) NH4NO3 (D) K2CO3
12. 10–5 M NaOH solution at 25ºC is diluted 1000 times. The pH of the solution will -
(A) be equal to 8 (B) lie between 7 and 8 (C) lie between 6 and 7 (D) remain unchanged
14. The pH of aqueous solutions of three acids A, B and C respectively is 3, 2 and 1. What will be the ratio of their
[H+] ?
(A) 1 : 2 : 3 (B) 300 : 200 : 10 (C) 100 : 10 : 1 (D) 1 : 10 : 100
15 10 mL of 0.1 N HCl is added to 990 mL solution of NaCl. The pH of the resulting solution is-
(A) zero (B) 3 (C) 7 (D) 10
IJSO STAGE-I
DAILY PRACTICE PROBLEMS
SESSION-2012-13
SUBJECT : CHEMISTRY DPP : 03
1. Slag is usually -
(A) lighter than molten metal. (B) heavier than molten metal.
(C) mixed with molten metal. (D) a form of silica.
8. In the commercial electro chemical process for aluminium extraction, the electrolyte used is -
(A) Al(OH)3 in NaOH solution (B) An aqueous solution of Al2(SO4)3
(C) A molten mixture of Al2O3 and Na3AlF6 (D) A molten mixture of Al2O3 and Al(OH)3
9. Leaching of silver from argentite is done by Mac-Arthur forest cyanide process which involves following
reaction.
Ag2S + NaCN [A]
10. Azurite is -
(A) 2CuCO3. Cu(HCO3)2 (B) CuCO3.2Cu(OH)2 (C) 2CuCO3. Cu(OH)2 (D) Cu(HCO3)2. Cu(OH)2
IJSO STAGE-I
DAILY PRACTICE PROBLEMS
SESSION-2012-13
SUBJECT : CHEMISTRY DPP : 04
2. Match List-I with List-II and select the correct answer using the codes given below the lists ( and m are
respectively the azimuthai and magnetic quantum no.)
List-I List-II
(A) Number of value of for an energy level (1) 0, 1, 2, ............. (n - 1)
(B) Value of for a particular type of orbital (2) + to – through zero
(C) Number of values of m for = 2 (3) 5
(D) Value of 'm' for a particular type of orbitals (4) n
3. The atoms of various isotopes of a particular element differ from each other in the number of -
(A) electron in the outer shell only (B) protons in the nucleus
(C) electrons in the inner shells only (D) neutrons in the nucleus
4. An electron in an atom -
(A) moves randomly around the nucleus.
(B) has fixed space around nucleus.
(C) is stationary in various energy levels.
(D) moves around its nucleus in definite energy levels.
7. Atomic number -
(i) is denoted by ‘Z’.
(ii) is no. of protons in an atom.
(iii) is no. of electrons in charged atom.
(iv) is equal to sum of protons and neutrons in an atom.
Correct statement is -
(A) (i) to (iv) all (B) (i) and (ii) only (C) (ii) and (iv) only (D) (iii) and (iv) only
8. For the energy levels in an atom which one of the following statement is correct ?
(A) The 4s sub-energy level is at a higher energy than the 3d sub-energy level.
(B) The M- energy level can have maximum of 32 electrons.
(C) The second principal energy level can have four orbitals and contain a maximum of 8 electrons.
(D) The 5th main energy level can have maximum of 50 electrons.
9. The order of increasing energies of the orbitals follows -
(A) 3s, 3p, 4s, 3d, 4p (B) 3s, 3p, 3d, 4s, 4p
(C) 3s, 3p, 4s, 4p, 3d (D) 3s, 3p, 3d, 4p, 4s
10. The number of electrons in an atom with atomic number 105 having ( n+ )=8 is
(A) 15 (B) 17 (C) 19 (D) 21
12. Consider the ground state of Cr atom.The number of electrons with the azumithal quantum numbers
= 1 and 2 are respectively-
(A) 12 and 4 (B) 12 and 5 (C) 16 and 4 (D) 16 and 5
IJSO STAGE-I
DAILY PRACTICE PROBLEMS
SESSION-2012-13
SUBJECT : CHEMISTRY 05 DPP :
3. Which of the following series of elements have nearly the same atomic radii ?
(A) F, Cl, Br, I (B) Na, K, Rb, Cs (C) Li, Be, B, C (D) Fe, Co, Ni, Cu
4. The elements having highest ionization enthalpies within their periods are called -
(A) halogens (B) noble gases (C) alkali metals (D) transition elements
9. In the modern periodic table which one of the following does not have appropriate position ?
(A) Inert gases (B) Inner-transition elements
(C) Transition elements (D) Fluorine
10. Element of which of the following atomic nos. has lowest EN?
(A) 37 (B) 55 (C) 87 (D) 105
5. Which of the following radiation have least effect on both the photographic plate and zinc sulphide screen ?
(A) -rays (B) -rays (C) - rays (D) All have equal effect
238
7. 92 U emits an alpha particle, the product has mass number and atomic number -
235 207
8. The isotope 92 U decays in a number of steps to an isotope of 82 Pb . The groups of particles emitted in
this process will be -
(A) 4 , 7 (B) 6, 4 (C) 7, 4 (D) 10, 1
9. When 226
88 Ra emits an -particle , the new element formed belongs to -
(A) third group (B) zero group (C) fourth group (D) second group
238
10. The 92 U disintegrates to give 4 and 6 particles. The atomic no. of the end product is -
Ques 1 2 3 4 5 6 7 8 9 10 11 12
Ans C A C A C D D A D C A B
Ques 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Ans C C A B D D D A D B D B C D B
Ques 1 2 3 4 5 6 7 8 9 10
Ans A C B D B B B C B C
Ques 1 2 3 4 5 6 7 8 9 10 11 12
Ans C D D C D B C A B B B
Ques 1 2 3 4 5 6 7 8 9 10
Ans D D D B C B B C B B
Ques 1 2 3 4 5 6 7 8 9 10
Ans D B B A C D B C B D