Free Printable Chp 1 - Chemical Reactions and Equations

1.

Oxidation involves

(i) gain of electron

(ii) loss of electron

(iii) addition of oxygen or electronegative element

(iv) removal of hydrogen or electropositive element

a)

(i), (ii), (iii)

b)

(ii), (iii), (iv)

c)

(i), (iii), (iv)

d)

(i), (ii), (iv)

2.

The formula of Ammonium phosphate is

a)

NH₄PO₄

b)

(NH₄)₂PO₄

c)

(NH₄)₃PO₄

d)

(NH₄)₃(PO₄)₂

3.

Which of the following is a thermal decomposition reaction?

a)

2H₂O → 2H₂ + O₂

b)

2AgCl → 2Ag + Cl₂

c)

ZnCO₃ → ZnO + CO₂

d)

H2(g) + Cl₂(g) → 2HCl(g)

4.

The following reaction is an example of a

4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)

(i) displacement reaction

(ii) combination reaction

(iii) redox reaction

(iv) neutralisation reaction

a)

(i) and (iv)

b)

(ii) and (iii)

c)

(i) and (iii)

d)

(iii) and (iv)

5.

Which of the following statements about the given reaction are correct?

3Fe(s) + 4H₂O(g) → Fe₃O₄(g) + 6H₂(g)

(i) Iron metal is getting oxidised

(ii) Water is getting reduced

(iii) Water is acting as reducing agent

(iv) Water is acting as an oxidising agent

a)

(i), (ii) and (iii)

b)

(iii) and (iv)

c)

(i), (ii) and (iv)

d)

(ii) and (iv)

6.

Which of the following are exothermic processes?

(i) Reaction of water with quick lime

(ii) Dilution of an acid

(iii) Evaporation of water

(iv) Sublimation of camphor (crystals)

a)

(i) and (ii)

b)

(ii) and (iii)

c)

(i) and (iv)

d)

(iii) and (iv)

7.

Which among the following is (are) double displacement reactions?

(i) Pb + CuCl₂ → PbCl₂ + Cu

(ii) Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl

(iii) C + O₂ → CO₂

(iv) CH₄ + 2O₂ → CO₂ + 2H₂O

a)

(i) and (iv)

b)

(ii) only

c)

(i) and (ii)

d)

(iii) and (iv)

8.

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved?

(i) Displacement reaction

(ii) Precipitation reaction

(iii) Combination reaction

(iv) Double displacement reaction

a)

(i) only

b)

(ii) only

c)

(iv) only

d)

(ii) and (iv)

9.

Electrolysis of water is a decomposition reaction. The molar ratio of hydrogen and oxygen gases liberated during electrolysis of water is

a)

1:1

b)

2:1

c)

4:1

d)

1:2

10.

Which of the following is (are) an endothermic process(es)?

(i) Dilution of sulphuric acid

(ii) Sublimation of dry ice

(iii) Condensation of water vapours

(iv) Evaporation of water

a)

(i) and (iii)

b)

(ii) only

c)

(iii) only

d)

(ii) and (iv)

11.

Which of the following gases can be used for storage of fresh sample of an oil for a long time?

a)

Carbon dioxide or oxygen

b)

Nitrogen or oxygen

c)

Carbon dioxide or helium

d)

Helium or nitrogen

12.

The following reaction is used for the preparation of oxygen gas in the laboratory

$2KCIO_3\left(s\right)\ \ \ Catalyst\rightarrow\ Heat\ \$

2KCl\left(s\right)+3O_2\left(g\right)

Which of the following statement(s) is (are) correct about the reaction?

a)

It is a decomposition reaction and endothermic in nature

b)

It is a combination reaction

c)

It is a decomposition reaction and accompanied by release of heat

d)

It is a photo chemical decomposition reaction and exothermic in nature

13.

Which one of the following processes involve chemical reactions?

a)

Storing of oxygen gas under pressure in a gas cylinder

b)

Liquefaction of air

c)

Keeping petrol in a china dish in the open

d)

Heating copper wire in presence of air at high temperature

14.

In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

a)

H₂(l) + O₂(l) → 2H₂O(g)

b)

H₂(g) + O₂(l) → 2H₂O(l)

c)

H₂(g) + O₂(g) → 2H₂O(l)

d)

H₂(g) + O₂(g) → m₂O(g)

15.

The brown gas evolved on heating of copper nitrate is

a)

O₂

b)

NO₂

c)

N₂

d)

NO

16.

Zinc reacts with silver nitrate to form which compounds?

a)

Zn(NO₃)₂ + Ag

b)

ZnNO₃ + Ag

c)

AgNO₃ + Zn(NO₃)₂

d)

Ag + Zn(NO₃)₃

17.

MnO₂ + 4HCl → MnCl₂ + H₂O + Cl₂ The oxidising agent is

a)

MnO₂

b)

HCl

c)

MnCl₂

d)

Ag + Zn(NO₃)₃

18.

$2Agl\left(s\right)\ \ \rightarrow\ Sunlight\ \ \ \ \ \ 2Ag\left(s\right)+I_2\left(g\right)$
The colour of iodine is

a)

Green

b)

Purple

c)

Brown

d)

Pink

19.

When green coloured ferrous sulphate crystals are heated, the colour of the crystal changes because

a)

it is decomposed to ferric oxide

b)

it loses water of crystallisation

c)

it forms SO₂

d)

it forms SO₃

20.

2HNO₃ + Ca(OH)₂ → Ca(NO₃)₂ + 2H₂O; is an example of

(i) displacement reaction

(ii) double displacement reaction

(iii) neutralisation reaction

(iv) combination reaction.

a)

(i) and (ii)

b)

(ii) and (iii)

c)

(iii) and (iv)

d)

(i) and (iv)

21.

Burning Magnesium ribbon is brought in the gas jar of carbon dioxide. Which of the following is correct?

(i) It keeps on burning

(ii) It gets extinguished

(iii) Although CO₂ is non-supporter of combustion but burning magnesium breaks CO₂ into carbon and oxygen, oxygen helps in burning.

(iv) Carbon dioxide is supporter of combustion.

a)

(i) and (iv)

b)

(i) and (iii)

c)

(i) and (ii)

d)

(iii) and (iv)

22.

What is observed when a solution of potassium iodide is added to silver nitrate solution?

a)

No reaction takes place

b)

White precipitate of silver iodide is formed

c)

yellow precipitate of Agl is formed

d)

Agl is soluble in water

23.

Identify ‘x’, ‘y’ and ‘z’ in the following balanced reaction

xPb\left(NO_3\right)_2\left(s\right)\ \ \ \rightarrow\ Heat\ \ \ \ yPbO9\left(s\right)

+zNO_2\left(g\right)+O_2\left(g\right)

a)

2, 4, 2

b)

2, 2, 4

c)

2, 4, 4

d)

4, 2, 2

24.

Which of the following is precipitation as well as double displacement reaction?

a)

$NaOH\left(aq\right)+HNO_3\left(aq\right)\rightarrow$
$NaNO_3\left(aq\right)+H_2O\left(l\right)$

b)

$Cu\left(s\right)+2AgNO_3\left(aq\right)$
$\rightarrow Cu\left(NO_3\right)_2\left(aq\right)+2Ag\left(s\right)$

c)

$2Hg\left(s\right)+O_2\left(g\right)\ \ \ \ \rightarrow\ Heat\ \ \ \$
$\ 2HgO\left(s\right)$

d)

$FeCl_3\left(aq\right)+3NH_4OH\left(aq\right)$
$\rightarrow Fe\left(OH\right)_3\left(s\right)+3NH_4Cl\left(aq\right)$

25.

Which of the following reactions will not take place?

a)

Zn + CuSO₄ → ZnSO₃ + Cu

b)

2KBr + Cl₂ → KCl + Br₂

c)

Zn + MgSO₄ → ZnSO₄ + Mg

d)

Mg + FeSO₄ → MgSO₄ + Fe

26.

Which of the following involves combination of two elements?

a)

N₂(g) + 3H₂(g) → 2NH₃(g)

b)

CaO(s) + CO₂(g) → CaCO₃(g)

c)

2SO₂(g) + O₂(g) → 2SO₃f(g)

d)

NH₃(g) + HCl(g) → NH₄Cl(s)

27.

In the reaction Hg₂Cl₂ + Cl₂ → 2HgCl₂ The reducing agent is

a)

Hg2Cl₂

b)

Cl₂

c)

HgCl₂

d)

Both Cl₂ and HgCl₂

Chp 1 - Chemical Reactions and Equations - 2

Total questions: 27

Worksheet time: 14mins

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