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G L Mock test Yr -8

Total questions: 40

Worksheet time: 53mins

Name
Class
Date
1.

Which type of reaction is:

H2 + O2 → H2O

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

2.

Which type of reaction is:

NiCl2 → Ni + Cl2

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

3.

Which type of reaction is:

MgI2 + Br2 → MgBr2 + I

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

4.

Which type of reaction is:

NH3 + HCl → NH4Cl

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

5.

In an exothermic reaction, energy is __________.

a)

taken in or absorbed

b)

given out or released

6.

In an endothermic reaction, energy is __________.

a)

taken in or absorbed

b)

given out or released

7.

Is photosynthesis an exothermic or endothermic reaction?

a)

Endothermic

b)

Exothermic

8.

What type of reaction occurs in a hand warmer?

a)

Exothermic

b)

Endothermic

9.

When a gas is heated, it will .......

a)

Expand and fall

b)

Expand and rise

c)

Condense and fall

d)

Condense and rise

10.

When salt is added to the ice begins to melt because the salt ...........

a)

Raises the freezing point of the water

b)

Lowers the freezing point of water

c)

Rises the boiling point of water

d)

Lowers the boiling point of water

11.

A substance that increases the rate of a reaction without being used up during the reaction is called a

a)

catalyst

b)

product

c)

reactant

d)

solute

12.

What is the name given to a catalyst in the human body?

a)

Biology

b)

Catalyst

c)

Chemical

d)

Enzyme

13.

When a catalyst is added to a reaction the rate of reaction,,,

a)

Increases

b)

Decreases

c)

Does not change

14.

A catalyst

a)

is used up

b)

is nevr used up

15.

What is the chemical symbol for sodium?

(a)  

16.

What is the name of the element represented by S?

(a)  

17.

What is the symbol for Silicon?

a)

S

b)

Si

c)

Sl

d)

Se

18.

the elements are arranged so that their atomic numbers increase from left to right across the Periodic Table

a)

true

b)

false

19.

Alkali metal + Water —> _____________ + ____________

a)

metal hydroxide and oxygen gas

b)

metal hydroxide and hydrogen gas

c)

metal oxide and oxygen gas

d)

metal oxide and hydrogen gas

20.

Lithium + Oxygen —> _________________

a)

Lithium hydroxide

b)

Lithium oxide

c)

Hydrogen gas

d)

Oxygen gas

21.

What is the correct decreasing order of metal reactivity with water ?

a)

Mg > Na > Li > K

b)

Mg > Li > Na > K

c)

Na > Li > Mg > K

d)

K > Na > Li > Mg

22.

Which of the following does not react with water?

a)

Copper

b)

Lithium

c)

Sodium

d)

Potassium

23.

Which of the following metals is the most reactive in dilute sulfuric acid?

a)

Magnesium

b)

Lead

c)

Zinc

d)

Potassium

24.

Name the products formed when zinc reacts with hydrochloric acid?

a)

zinc oxide and water

b)

zinc oxide and water

c)

zinc chloride and hydrogen gas

d)

zinc hydroxide and hydrogen gas

25.

Arrange these metals in decreasing order of reactivity with dilute hydrochloric acid.

Mg, Fe, Ca, Zn, Cu

a)

Ca > Mg > Zn > Fe > Cu

b)

Ca > Mg > Zn > Fe > Mg

c)

Fe > Mg > Zn > Ca > Mg

d)

Zn > Fe > Mg > Ca > Mg

26.

Which of the following metals is kept under oil ?

a)

Copper

b)

Gold

c)

Zinc

d)

Potassium

27.

Zara mixes two chemicals in a beaker and puts the beaker in some ice, as the chemical react, the ice starts to melt.

Which statement is correct?

The reaction in the beaker is......................

a)

Endothermic because the energy is absorbed

b)

Endothermic because the energy is released

c)

Exothermic because the energy is released

d)

Exothermic because the energy is absorbed

28.

What is formed when hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH)

a)

NaCl and H2O

b)

NaOH and H2O

c)

HCl and NaCl

d)

NaOH and HCl

29.

Which group contains Noble gases............

a)

Group -1

b)

Group -2

c)

Group -7

d)

Group 0 or 8

30.

Sarah drops food colouring into beakers of water at different temperatures.

She records how it takes food colouring to diffuse completely.

What can be concluded from the data in the table?

a)

The temperature has no effect on the diffusion rate

b)

The food colouring is less soluble at lower temperatures.

c)

The greater the temperature, faster the diffusion rate.

d)

The lower the temperature, shorter the time of diffusion

31.

What is the name given to the group of elements that do not readily react with other elements?

a)

Group -1

b)

Group -2

c)

Group -7

d)

Group 0 or 8

32.

When a substance speeds up a chemical reaction without being consumed in the process, it is known as a...

a)

Reactant

b)

Product

c)

Catalyst

d)

Solvent

33.

Identify the type of reaction represented by the following equation:

2H2 + O2 → 2H2O

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

34.

a)

A

b)

B

c)

C

d)

D

35.

a)

A

b)

B

c)

C

d)

D

36.

a)

A

b)

B

c)

C

d)

D

37.

a)

A

b)

B

c)

C

d)

D

38.

a)

A

b)

B

c)

C

d)

D

39.

a)

A

b)

B

c)

C

d)

D

40.

a)

A

b)

B

c)

C

d)

D

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