NCERT CHEMISTRY MOCK TEST 3

🟥 NCERT CHEMISTRY MOCK TEST 3

🟥 QUESTIONS : 25

🟥 TIME : 15 MINS

1 / 25

1) Which one of the following polymers is widely used for making bullet proof material?

A) Polyvinyl chloride

B) Polyamides

C) Polyethylene

D) Polycarbonates

2 / 25

2) Photochemical smog is a resultant of the reaction among

A) NO2, O3 and peroxyacetyl nitrate in the presence of sunlight

B) CO, O2 and peroxyacetyl nitrate in the presence of sunlight

C) CO, CO2 and NO2 at low temperature

D) high concentration of NO2, O3 and CO in the evening

3 / 25

3) Lead, ingested or inhaled, is a health hazard. After the addition of lead to petrol has been banned, what still are the sources of lead poisoning ?

1. Smelting units

2. Pens and pencils

3. Paints

4. Hair oils and cosmetics

A) 1, 2 and 3 only

B) 1 and 3 only

C) 2 and 4 only

D) 1, 2, 3 and 4

4 / 25

4) Which one of the following pairs of metals constitutes the lightest metal and the heaviest metal, respectively?

A) Lithium and mercury

B) Lithium and osmium

C) Aluminium and osmium

D) Aluminium and mercury

5 / 25

5) Which one of the following is also called Stranger Gas?

A) Argon

B) Neon

C) Xenon

D) Nitrous oxide

6 / 25

6) What are Rubies and Sapphires chemically known as?

A) Silicon dioxide

B) Aluminium oxide

C) Lead tetroxide

D) Boron nitride

7 / 25

7) Which one of the following does not contain silver?

A) Horn silver

B) German silver

C) Ruby silver

D) Lunar caustic

8 / 25

8) Which one among the following is called philosopher’s wool?

A) Zinc bromide

B) Zinc nitrate

C) Zinc oxide

D) Zinc chloride

9 / 25

9) Which one of the following types of glass can cut off ultraviolet rays?

A) Soda glass

B) Pyrex glass

C) Jena glass

D) Crookes glass

10 / 25

10) Which one of the following non-metals is not a poor conductor of electricity?

A) Sulphur

B) Selenium

C) Bromine

D) Phosphorus

11 / 25

11) Which are the materials generally employed as solder in soldering operations in electronics?

A) Iron and tin

B) Lead and tin

C) Aluminium and lead

D) Aluminium and iron

12 / 25

12) Salts of which of the following elements provide colours to fireworks?

A) Zinc and sulphur

B) Potassium and mercury

C) Strontium and barium

D) Chromium and nickel

13 / 25

13) Consider the following statements:

1. Baking soda is used in fire extinguishers

2. Quick lime is used in the manufacture of glass

3. Gypsum is used in the manufacture of plaster of Paris

Which of the statements given above is/are correct?

A) 1 and 2

B) 2 and 3

C) 1 only

D) 1,2 and 3

14 / 25

14) Assertion (A) : Coal-based thermal power stations contribute to acid-rain.

Reason (R) : Oxides of carbon are emitted when coal burns.

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

B) Both A and R are individually true but R is not the correct explanation of A

C) A is true but R is false

D) A is false but R is true

15 / 25

15) Assertion (A) : In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group

Reason (R) : In a group, the atomic radii generally increase from top to bottom.

A) Both A and R are individually true and R is the correct explanation of A .

B) Both A and R are individually true but R is not the correct explanation of A

C) A is true but R is false

D) A is false but R is true

16 / 25

16) Which one of the following statements is NOT correct?

A) The presence of NaCl increases the rate of setting of plaster of Paris

B) Gypsum is added to the cement to slow down its rate of setting

C) All alkaline earth metals form hydrated salts

D) Barium and strontium are found free in nature

17 / 25

17) Assertion : Synthetic detergents can lather well in hard water.

Reason (R) : Synthetic detergents form soluble calcium and magnesium salts with hard water.

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

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

C) A is true but R is false

D) A is false but R is true

18 / 25

18) Consider the following statements with reference to the periodic table of chemical elements:

1. Ionisation potential gradually decreases along a period

2. In a group of elements, electron affinity decreases as the atomic weight increases

3. In a given period, electronegativity decreases as the atomic number increases

Which of these statement (s) is/are correct?

A) 1 only

B) 2 only

C) 1 and 3

D) 2 and 3

19 / 25

19) An aqueous solution of copper sulphate is acidic in nature because the salt undergoes

A) dialysis

B) electrolysis

C) hydrolysis

D) photolysis

20 / 25

20) Consider the following statements: Hard water is not suitable for

1. drinking

2. washing clothes with soap

3. Use in boilers

4. Irrigating crops

Which of these statements are correct?

A) 1 and 3

B) 2 and 3

C) 1,2 and 4

D) 1,2,3 and 4

21 / 25

21) Aluminium surface are often ‘anodized’. This means the deposition of a layer of

A) chromium oxide

B) aluminium oxide

C) nickel oxide

D) zinc oxide

22 / 25

22) Which one of the following materials is very hard and very ductile?

A) Carborundum

B) Tungsten

C) Cast iron

D) Nichrome

23 / 25

23) Assertion (A) : To dilute sulphuric acid, acid is added to water and not water to acid.

Reason (R) : Specific heat of water is quite large.

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

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

C) A is true but R is false

D) A is false but R is true

24 / 25

24) Assertion (A) : Sodium metal is stored under kerosene.

Reason (R) : Metallic sodium melts when exposed to air.

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

B) Both A and R are true but R is NOT the correct explanation of A

C) is true but R is false

D) A is false but R is true

25 / 25

25) Which one of the following metals does not form amalgam?

A) Zinc

B) Copper

C) Magnesium

D) Iron

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NCERT CHEMISTRY MOCK TEST 3

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