Chemical Reactions and Equations Test

Result

Chemical Reactions and Equations Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

A student added zinc granules to copper sulphate solution taken in a test tube. Out of the following, the correct observation (s) made by the student will be
I. zinc granules have no regular shape.
II. Zinc granules have silvery grey colour.
III. The colour of zinc granules changed to brownish black.

A
I, II and III

B
I only

C
III only

D
II only

Solution

Zn granules are silvery grey of variable sizes and displaces Cu from its compound to turn brownish in colour
Question 2
1 / -0

When a student added zinc granules to dilute HCl, a colour less and odourless gas was evolved, which was tested with a burning match stick it was observed that

A
The match stick burns slowly with a blue flame

B
The match stick continue to burn brilliantly

C
The match stick burns with an orange flame.

D
The match stick extinguished and the gas burns with pop sound

Solution

Hydrogen gas puts off a burning splinter with a pop sound
Question 3
1 / -0

Silver chloride turns grey in sunlight to from silver metal is a

A
None of these

B
Double displacement

C
photochemical combination

D
photochemical decomposition

Solution

Under sunlight silver salt gets decomposed so it is a photochemical decomposition reaction
Question 4
1 / -0

If the solution of lead (II) nitrate and potassium iodide are mixed together. What is the colour of the precipitate obtained?

A
Blue ppt.

B
yellow ppt

C
red ppt

D
Black ppt

Solution

Since PbI₂is precipitated out which is yellow in colour and potassium nitrate is in solution
Question 5
1 / -0

A solution of substance ‘X’ is used for white washing. Name the substance ‘X’

A
CuO

B
CaCO₃

C
Ca(OH)₂

D
CaO

Solution

CaO + H₂O gives Ca(OH)₂which is used for whitewashing
Question 6
1 / -0

Match the following with correct response.
(1) Oxidation
(2) Reduction
(3) Reducing agent
(4) Oxidising agent

(A) Gain of electron
(B) Electron accepting species
(C) Electron losing species
(D) Loss of electron

A
1-B, 2-D, 3-A, 4-C

B
1-A, 2-C, 3-B, 4-D

C
1-C, 2-B, 3-D, 4-A

D
1-D, 2-A, 3-C, 4-B

Solution

oxidation is loss of electron and reduction is gain of electrons

Reducing agent is itself oxidized and oxidizing agent is itself reduced so reducing agent electron losing species and oxidizing one is electron gaining species
Question 7
1 / -0

Match the following with correct response.
(1) Chemical change
(2) Physical change
(3) Exothermic
(4) Endothermic

(A) Energy releasing
(B) Rusting of iron
(C) Energy absorbed
(D) Dissolution of sugar or salt in water

A
1-C, 2-B, 3-D, 4-A

B
1-A, 2-C, 3-B, 4-D

C
1-B, 2-D, 3-A, 4-C

D
1-D, 2-A, 3-C, 4-B

Solution

Rusting us a chemical change and sugar dissolving in water physical change

Energy releasing is exothermuc and energy absorbing is endothermic
Question 8
1 / -0

Match the following with correct response.
(1) Gain of hydrogen
(2) Loss of hydrogen
(3) Unpleasant taste and foul small in fatty food
(4) Eating away of metal in the presence of air and moisture

(A) Reduction
(B) Rancidity
(C) Oxidation
(D) Corrosion

A
1-D, 2-A, 3-C, 4-B

B
1-A, 2-C, 3-B, 4-D

C
1-B, 2-D, 3-A, 4-C

D
1-C, 2-B, 3-D, 4-A

Solution

Rancidity is presence of foul smell in food

Loss of hydrogen is oxidation and gain is reduction

Rusting occurs in presence of air and moisture
Question 9
1 / -0

Match the following with correct response.
(1) Evolution of gas
(2) Mass of reactant is equal to mass of products
(3) Increase in temperature
(4) Pop sound

(A) conservation of mass
(B) Evolution of Hydrogen gas
(C) Exothermic change
(D) Chemical change

A
1-C, 2-B, 3-D, 4-A

B
1-A, 2-C, 3-B, 4-D

C
1-D, 2-A, 3-C, 4-B

D
1-B, 2-D, 3-A, 4-C

Solution

Hydrogen gas goes off with a pop sound

conservation of mass is reactants equal to products in a reaction

exothermic reaction is accompanied by increase in tempersture

Evolution of gas is due to chemical reaction

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Chemical Reactions and Equations Test - 12

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Chemical Reactions and Equations Test - 12

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Question 1

I, II and III

I only

III only

II only

Solution

Question 2

The match stick burns slowly with a blue flame

The match stick continue to burn brilliantly

The match stick burns with an orange flame.

The match stick extinguished and the gas burns with pop sound

Solution

Question 3

None of these

Double displacement

photochemical combination

photochemical decomposition

Solution

Question 4

Blue ppt.

yellow ppt

red ppt

Black ppt

Solution

Question 5

CuO

CaCO3

Ca(OH)2

CaO

Solution

Question 6

1-B, 2-D, 3-A, 4-C

1-A, 2-C, 3-B, 4-D

1-C, 2-B, 3-D, 4-A

1-D, 2-A, 3-C, 4-B

Solution

Question 7

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

1-B, 2-D, 3-A, 4-C

1-D, 2-A, 3-C, 4-B

Solution

Question 8

1-D, 2-A, 3-C, 4-B

1-A, 2-C, 3-B, 4-D

1-B, 2-D, 3-A, 4-C

1-C, 2-B, 3-D, 4-A

Solution

Question 9

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

Solution

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CaCO₃

Ca(OH)₂