CHEMISTRY SET-3

Question 1:

Match List I with List II.
List I - List II
A. Tartaric acid - 1. Red ants
B. Formic acid - 2. tamarind
C. Uric acid - 3. Apples
D. Maleic acid - 4. Urine of mammals
Codes
A B C D

2 1 4 3

1 4 3 2

4 3 2 1

3 2 1 4

Question 2:

Which of the following is not correct about baking soda?

It is used in soda-acid fire extinguishers.

It is added for faster cooking.

It is a corrosive base.

It neutralises excess acid in the stomach.

Question 3:

Consider the following statements.
I. Acids are sour in taste and change the colour of blue litmus to red.
II. Bases are bitter and change the colour of red litmus to blue.
III. Litmus is a natural indicator.it is a purple dye.
Which of the statements given above is/are not correct?

I and II

I and III

II and III

none

Question 4:

The pH of fresh groundwater slightly decreases upon exposure to air because:

carbon dioxide from air is dissolved in the water.

oxygen from air is dissolved in the water.

the dissolved carbon dioxide of the groundwater escapes into air.

the dissolved oxygen of the groundwater escapes into air.

Question 5:

Consider the following statements.
I. The freezing of water into ice is a chemical change.
II. The changes occurring in the internal molecular composition is a chemical change.
III. A new substance is obtained in a chemical change.
IV. The change in shape, size and state is chemical change.
Which of the statements given above is/are correct?

I and II

II and III

I, II and III

I and IV

Question 6:

Which one of the following reducing agents can also act as an oxidising agent?

H2

H2S

SO2

HI

Question 7:

Which of the following causes the rusting of iron?
I. Oxidation
II. Reduction
III. Chemical reaction with oxygen
Iv. Chemical reaction with CO2

I and II

II and III

III and IV

I and II

Question 8:

An example of physical change:

blackening of silverware.

burning of candles.

making curd from milk.

dissolving of sugar in water

Question 9:

Assertion (A) A chemical reaction becomes faster at a higher temperature.
Reason (R) At higher temperature, molecular motion becomes more rapid.
Codes

Both A and R are true and R is the correct explanation of A

Both A and R are true, but R is not the correct explanation of A

A is true, but R is false

A is false, but R is true

Question 10:

Soaps clean surface on the principle is based on:

viscosity

floatation

elasticity

surface tension

Question 11:

Match List I (Colloidal Dispersion) with List II
(Nature of the Dispersion) and select the correct answer using the codes given below the lists.
List I - List II
A. Milk - 1. Solid in liquid
B. Clouds - 2. Liquid in gas
C. Paints - 3. Solids in solids
D. Jellies - 4. Liquids in liquids
5. Liquid in Solid
Codes
A B C D

4 2 1 5

1 5 3 2

4 5 1 2

1 2 3 5

Question 12:

A substance which readily forms colloidal solution in contact with water is called:

extrinsic colloid

associated colloid

hydrophobic colloid

hydrophilic colloid

Question 13:

Which type of colloidal system is expressed in the fog?

Liquid in a gas

Gas in a liquid

Solid in a gas

Liquid in Liquid

Question 14:

Which of the following is an example of colloidal solution of liquid in solid?

Mud

Milk

Cheese

Rubber

Question 15:

Consider the following statements.
The electrochemical series helps
I. in extraction of metals.
II. in protecting the metal from corrosion.
III. in comparing the reactivity of metals.
Which of the above is/are true?

Only I

Only II

II and III

I, II and III

CHEMISTRY SET-3

Question 1:

Question 2:

Question 3:

Question 4:

Question 5:

Question 6:

Question 7:

Question 8:

Question 9:

Question 10:

Question 11:

Question 12:

Question 13:

Question 14:

Question 15:

00:00:00

Welcome

Verify Your Email