ACP1withsolution 16303 16301873391
ACP1withsolution 16303 16301873391
ACP1withsolution 16303 16301873391
PRASHANT KIRAD
PRASHANT KIRAD
3. Which the following statements about the given reaction are correct:
3Fe(s) + 4H 2O (g) ➜ Fe 2O 3(s) + 4H 2(g)
i) Iron metal is getting oxidized
ii) Water is getting reduced
iii) Water is acting as reducing agent
iv) Water is acting as oxidizing agent
a) (i), (ii) and (iii) b) (iii) and (iv)
c) (i), (ii) and (iv) d) (ii) and (iv)
JOSH METER?
PRASHANT KIRAD
8. When iron nails are dipped into Copper Sulphate solution. The colour of
Copper Sulphate solution changes from
a. Green to blue b. Blue to green
c. Green to colourless d. Blue to colourless
Q.13 Name the brown coloured gas evolved when lead nitrate crystal are
heated in dry test-tube.
Q. 14 Give reasons
a) Silver chloride is stored in dark coloured bottles.
b) Copper vessel loses shine when exposed to air
c) Iron displaces copper from copper sulphate solution.
PRASHANT KIRAD
16. What changes do you observe in iron nails and colour of copper sulphate
solution, if iron nails are dipped in CuSO4 , solution for Sometime?
20. Potato chips manufacturers fill the packet of chips with nitrogen gas. Why?
24. What happens when milk is left open at room temperature during
summers ?
3. A student took solid quick lime in a china dish and added a small amount
of water to it. He would hear
a) pop sound
b) a crackling sound
c) hissing sound
d) no sound at all
4. Assertion (R): Chips manufactures usually lush bags of chips with gas such as
nitrogen to prevent the chips from getting oxidized. Reason (R): This increases
the taste of the chips and helps in their digestion.
5. Assertion (R): Rusting of iron metal is the most common form of corrosion.
Reason (R): The effect of rusting of iron can be reversed if they are left open in
sunlight.
(ho jaayenge aaram se)
3. Name and state the law which is kept in mind when we balance a chemical
equation.
13. Compound 'X' decomposes to form compound 'Y' and CO2 gas.
Compound Y is used in manufacturing of cement.
(a) Name the compounds 'X' and 'Y'.
(b) Write the Chemical equation for this reaction.
14. A metal salt MX when exposed to light spits up to form metal M and
gas X 2.. Metal M is used to make ornaments whereas gas X 2 is used in making
bleaching powder. The salt MX is used in black & white photography
(a) Identify the metal M and gas X 2 .
(b) Identify MX.
(c) Write down the chemical reaction when salt MX is exposed to sunlight.
15. A metal strip X is dipped in blue coloured salt solution YSO4 . After some
time a layer of metal 'Y’ is formed on metal strip X. Metals X is used in
galvanization whereas metal Y is used for making electric wires.
(a) What could be metal 'X’ and ‘Y’?
(b) Name the metal salt YSO 4
PRASHANT KIRAD
(c) What type of chemical reaction takes place between X and YSO ,
4
Write the balanced chemical equation.
17. Decomposition reactions require energy either in the form of heat or light a
electricity for breaking down of reactions. Write one equation for each type of
decomposition reaction where heat, light or electricity is used as form of energy
18. 2 gm of silver chloride is taken in china dish, and china dish is placed in
sunlight for sometime. What will be your observation. Write the balanced
chemical equation for above reaction and identify the type of reaction. (CBSE-
2019)
19. Identify the type of reactions taking place in each of following cases and
write the balanced chemical equation for the reactions.
a) Zn reacts with silver nitrate to produce zinc nitrate and silver.
b) Potassium iodide reacts with lead nitrate to produce potassium nitrate and
lead iodide (CBSE-2019)
(pahle points socho firr likho)
LONG ANSWER TYPE QUESTIONS (5
Marks)
1. White wash was being done at Mukesh's house. Mukesh saw that the painter
added quick lime to drum having water. Mukesh touched outer surface of drum,
it is unbelievably hot.
(a) Write the chemical equation for above reaction.
(b)What type of reaction is it?
(c) This reaction is exothermic or endothermic. Justify your answer.
(v) In a beaker take small amount of calcium oxide. When water is added to it.
The temperature of the breaker will increase because:
(a) A suspension of calcium hydroxide is formed
(b) The beaker will be hot when touched
(c) Clear solution appears when suspension of calcium hydroxide settles down
to the bottom of the beaker.
(d) All of the above
SOLUTIONS
PRASHANT KIRAD
SOLUTIONS
VERY SHORT ANSWER TYPE QUESTIONS:
2.b) 2:1
4.c) N2
6.c) I and II
9. b) Displacement Reaction
10.a) H2 + Cl 2➜2HCl
12.The reducing agent in the given reaction 3MnO₂ + 4AL → 3Mn + 2AL₂O₃
is Almunium (Al)
13.When lead nitrate crystals [Pb(NO3 ) 2 ] are heated in a dry test tube, the
evolution of brown coloured nitrogen dioxide and oxygen gas takes place.
2Pb(NO3)2 (s) → 2PbO(s) + 4NO 2↑(g)+ O2 ↑(g)
14. a)Compounds Like Silver Chloride are light sensitive. And they may react to
light very fast and lose its properties. That's why they are to be stored in dark
bottles to prevent the entry of Light
PRASHANT KIRAD
SOLUTIONS
VERY SHORT ANSWER TYPE QUESTIONS:
SOLUTIONS
VERY SHORT ANSWER TYPE QUESTIONS:
16. Iron nails gets covered with a red-brown coating of copper metal. The blue
colour of copper sulphate solution fades gradually because of the formation of
iron sulphate. Reaction is as follows:
Fe + CuSO4(aq) → FeSO4(aq) + Cu
20.The potato chips manufacturer uses nitrogen gas to flush the chips bags to
prevent the chips from getting oxidized in presence of oxygen from the
atmosphere. When fats and oils are oxidized they become rancid and their smell
and taste change.
21. Compounds Like Silver Chloride are light sensitive. And they may react to
light very fast and lose its properties. That's why they are to be stored in dark
bottles to prevent the entry of Light
PRASHANT KIRAD
SOLUTIONS
VERY SHORT ANSWER TYPE QUESTIONS:
24. When milk is left at room temperature during the summer, it undergoes an
oxidation reaction and microbe development, causing it to become sour. It also
begins to break, which can be seen on the top of the vessel.
25. When water is added to quicklime, calcium hydroxide is obtained with the
evolution of heat. There is a rise in temperature.
CaO(s) + H2 O (l) ➜ Ca(OH)2 + Heat ↑
2. b) light green
3. c) hissing sound
27. 1. (a) Both A and R are true, and R is correct explanation of the assertion.
2. (a) Both A and R are true, and R is correct explanation of the assertion.
3. (a) Both A and R are true, and R is correct explanation of the assertion.
5. (b) Both A and R are true, but R is not the correct explanation of the assertion.
PRASHANT KIRAD
SOLUTIONS
SHORT ANSWER TYPE QUESTION:
1. When two or more substances (elements or compounds) combine to form a
single product, the
reactions are called combination reactions. This can be represented by the
general equation: A+B→AB
The Two Examples of Combination Reactions Which Are Exothermic In Nature
Are -
•Combustion of magnesium (Mg) in air, where magnesium (Mg) combines with
oxygen (O2) to form magnesium
oxide(MgO) ,along with the liberation of heat. Thus it is considered an
Exothermic Reaction
•2Mg(s)+O2 (g)→ 2MgO(s) + Heat
•When quicklime (Cao) reacts with water (H 2O), Calcium hydroxide (Ca(OH)2) is
formed along with the liberation
of heat. Thus it is considered an Exothermic reaction.
•CaO(s)+H2 O(l)→Ca(OH)2 (aq)+Heat
Hl
2. Those reaction in which a compound splits up into two or more than two
simpler substance are known as decomposition reaction. This can be
represented by the general equation: AB → A + B.
Example Of Decomposition Reactions is
•Calcium carbonate (CaCO 3) decomposes into calcium oxide (Cao) and carbon
dioxide ( Co2 )when heated
Heat
•CaCO3(s) → CaO(s)+CO2(g)
3. It is the law of conservation of mass which states that mass can neither be
created nor destroyed. So both the sides of the chemical reactions have to be
balanced to ensure that this law is followed.
PRASHANT KIRAD
SOLUTIONS
SHORT ANSWER TYPE QUESTION:
4. a) The chemical reaction between zinc(Zn) and dilute sulphuric acid(H2SO4)
in this reaction Zinc
Sulphate(ZnSO4 ) is formed and Hydrogen gas is evolved (H2)
•Zn(s)+H2SO4(aq)→ZnSO4(aq)+H2↑(aq)
b) The reaction between lead nitrate(Pb(NO3)2 ) solution and potassium iodide
(2KI) solution.Before reaction the solution is colourless and after reaction the
yellow colour lead iodide (PbI2 ) is formed And Also Potassium Nitrate(2KNO 3) is
formed.
•Pb(NO3) 2 (aq)+2KI→Pbl2 (s)+2KNO3(aq)
5. The oxidation of oils or fats in a food resulting into bad smell and bad taste is
called rancidity.
It can be prevented by-
i adding anti- oxidants.
ii flushing with nitrogen gas.
8. Zinc displaces copper from copper sulphate and generates zinc sulphate
solution when added to CuSO4 solution because zinc is a more reactive metal
that displaces less reactive metal from its solution for this reason displacement
reaction occurs. A color change from blue to colorless indicates this.
Zn(s)+CuSO4(aq)➜ ZnSO (aq) + Cu(s)
4
PRASHANT KIRAD
SOLUTIONS
SHORT ANSWER TYPE QUESTION:
9. Redox reactions are reactions in which both the oxidation and reduction
processes take place simultaneously.
Example of redox reaction:An example of a redox reaction is:In the above
reaction, hydrogen is oxidized to water
2H2(g) + O2(g) ➜ 2H2 O
• The process of using electricity to split water into hydrogen and oxygen is
known as electrolysis.
Water
Hl
Hydrogen Oxygen
• Two moles of water undergo electrolysis and produce two moles hydrogen and
one mole of oxygen gas.
• Because the water molecule contains two hydrogens and one oxygen in its
molecular formula.
• So, when a direct current is passed through the water it won't conduct.
SOLUTIONS
SHORT ANSWER TYPE QUESTION:
11.a)H₂ is the substance oxidised.
12. (a) White coloured silver chloride undergoes decomposition in the presence
of sunlight and forms silver (grey in colour) and chlorine.
(b) Brown coloured copper powder on heating in air gets oxidised to copper
oxide which is black in colour
(c) The chemical reaction when silver chloride (AgCl) is exposed to sunlight is:
In this reaction, silver chloride decomposes into silver metal (Ag) and chlorine
gas (Cl₂) due to the energy from sunlight breaking the chemical bonds in the
silver chloride.
PRASHANT KIRAD
SOLUTIONS
SHORT ANSWER TYPE QUESTION:
15. (a) Metal X is likely zinc (Zn) because zinc is commonly used in galvanization,
which is the process of applying a protective zinc coating to iron or steel to
prevent rusting. Metal Y is likely copper (Cu) because copper is commonly used
for making electric wires due to its excellent electrical conductivity.
(b) The metal salt YSO₄ could be copper sulfate (CuSO₄). Copper sulfate is often
used in industrial applications and is known for its blue color when dissolved in
water.
(c)The type of chemical reaction that takes place between metal X (likely zinc)
and the salt solution YSO₄ (likely copper sulfate) is a single displacement
reaction, also known as a displacement reaction or a substitution reaction. In
this reaction, the more reactive metal (zinc) displaces the less reactive metal
(copper) from its salt solution.
In words, this equation reads as: Zinc (s) + Copper sulfate (aq) → Zinc sulfate (aq)
+ Copper (s)
In this reaction, zinc replaces copper in the copper sulfate solution, leading to
the formation of zinc sulfate and copper metal.
(b) The compound that is precipitated is lead iodide, which is insoluble in water
and forms a yellow precipitate.
In words, this equation reads as: Lead nitrate (aq) + Potassium iodide (aq) → Lead
iodide (s) + Potassium nitrate (aq)
PRASHANT KIRAD
SOLUTIONS
SHORT ANSWER TYPE QUESTION:
17. The following decomposition reaction are
Light
SOLUTIONS
SHORT ANSWER TYPE QUESTION:
19. (a) The reaction between zinc (Zn) and silver nitrate (AgNO₃) is a
displacement reaction. Zinc replaces silver in the compound to form zinc nitrate
(Zn(NO₃)₂) and silver (Ag). The balanced chemical equation is:
Zn + 2AgNO₃ → Zn(NO₃)₂ + 2Ag
(b) The reaction between potassium iodide (KI) and lead nitrate (Pb(NO₃)₂) is a
double displacement reaction. Potassium iodide and lead nitrate exchange ions
to form potassium nitrate (KNO₃) and lead iodide (PbI₂). The balanced chemical
equation is:
2KI + Pb(NO₃)₂ → 2KNO₃ + PbI₂
Hl
PRASHANT KIRAD
SOLUTIONS
LONG ANSWER TYPE QUESTION:
1. (a) The chemical equation for the reaction when quicklime (calcium oxide,
CaO) is added to water (H₂O) to form slaked lime (calcium hydroxide, Ca(OH)₂)
is:
(c) The reaction is highly exothermic. This is because when water is added to
quicklime, it undergoes a strong exothermic reaction, releasing a large amount
of heat. This heat causes the drum to become very hot, as observed by Mukesh
when he touched the outer surface of the drum.
2.(a) Silver chloride is decomposed in the presence of sunlight to give silver and
chlorine gas:
Hl
2AgCl(s) + light → 2Ag(s) + Cl₂(g)
(c) Sodium hydroxide reacts with hydrochloric acid to give sodium chloride and
water:
NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O(l)
(d) Dilute hydrochloric acid is added to copper oxide to give green colored
copper chloride and water:
CuO(s) + 2HCl(aq) → CuCl₂(aq) + H₂O(l)
(e) This equation represents the reaction between barium chloride and sodium
sulfate to form insoluble barium sulfate and soluble sodium chloride.
BaCl₂(aq) + Na₂SO₄(aq) → BaSO₄(s) + 2NaCl(aq)
PRASHANT KIRAD
SOLUTIONS
CASE STUDY / SOURCE BASED TYPE QUESTION:
1.(i) (b) CaCO₃
Hl