SET-4 Chemistry MCQs | Objective Type Questions

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Chemistry MCQs | Objective Type Questions | MCQs SET-4

1.Which among the following element is an essential constituent of acids?

[A] Nitrogen
[B] Hydrogen
[C] Helium
[D] Oxygen

Correct Answer: B [Hydrogen]

2.Acid rain is capable of damaging the buildings and historic monuments which are made up of rocks such as limestone and marble. Which among the following is the end product of such reaction?

[A] Quick Lime
[B] Calcium Carbonate
[C] Calcium Hydroxide
[D] Gypsum

Correct Answer: D [ Gypsum]

Notes:
Acid rain is capable of damaging the buildings and historic monuments which are made up of rocks such as limestone and marble. This is because these rocks contain a large amount of Calcium Carbonate, which reacts with the Sulfuric Acid to create Gypsum. Gypsum flakes off easily. This is shown in the following reaction: CaC03 (s) + H2S04 (aq) – CaS04 (aq) + C02 (g) + H20 (I)

3.  Which of the following can be used as coolant in a nuclear reactor?

1. Carbon dioxide
2. Liquid sodium
3. Helium (He) gas

 Select the correct option from codes given below:

[A] 1 & 2 Only
[B] 2 & 3 Only
[C] 1 & 3 Only
[D] 1, 2 & 3

Correct Answer: D [ 1, 2 & 3]

Notes:
A nuclear reactor coolant is a coolant used to remove heat from the nuclear reactor core and transfer it to electrical generators and the environment. Carbon dioxide, Helium and Liquid Sodium can be used as coolant in a nuclear reactor.

4.Which of the following chemicals is also known as "Vitriol of clay”?

[A] Aluminium sulphate
[B] Sodium silicate
[C] Zinc sulphate
[D] Copper(II) sulphate

Correct Answer: A [ Aluminium sulphate]

Notes:
Aluminium sulphate is also known as Vitriol of clay. It is soluble in water and is mainly used as a flocculating agent in the purification of drinking water

5.What is the ratio of normal stress to the volumetric strain within the elastic limits is called as?

[A] Bulk Modulus
[B] Young Modulus
[C] Modulus of Rigidity
[D] None of the above

Correct Answer: A [Bulk Modulus]

Notes:
The ratio of normal stress to the volumetric strain within the elastic limits is called as Bulk modulus. It is denoted by K.

6.Which of the following alkaline earth metals is the rarest in the earth crust?

[A] Calcium
[B] Strontium
[C] Radium
[D] Beryllium

Correct Answer: C [Radium]

Notes:
Of the alkaline earth metals calcium and magnesium rank fifth and sixth in abundance respectively in the earth’s crust. Strontium and barium have much lower abundances. Beryllium is rare and radium is the rarest of all comprising only 10^–10 per cent of igneous rocks.

7.Which of the following is NOT correct about Alkynes?

[A] They contain at least two triple bond between two carbon atoms
[B] The number of hydrogen atoms is less in alkynes as compared to alkenes
[C] The general formula of Alkynes is C_nH_2n–2
[D] All are correct

Correct Answer: A [They contain at least two triple bond between two carbon atoms]

Notes:
Alkynes contain at least one triple bond between two carbon atoms. The number of hydrogen atoms is less in alkynes as compared to alkenes or alkanes. Their general formula is C_nH_2n–2.

8.Which of the following is correct about Solder?

[A] It is an alloy of lead and tin
[B] It is used for welding electrical wires together
[C] It has a low melting point
[D] All of the above

Correct Answer: D [All of the above]

Notes:
Solder is an alloy of lead and tin (Pb and Sn). It has a low melting point and is used for welding electrical wires together.

9.Which of the following is a naturally occurring alloy of Gold and Silver?

[A] Bronze
[B] Electrum
[C] Duralumin
[D] Nordic gold

Correct Answer: B [Electrum]

Notes:
Electrum is a naturally occurring alloy of gold and silver. The first metal coins ever made were of electrum and date back to the end of the 7th century.

10.Which of the following is a correct statement about minerals and ores?

[A] All minerals are ores
[B] All ores are minerals
[C] Minerals are the native form in which various metals exist
[D] Ores are usually used to extract metals economically

Correct Answer: A [All minerals are ores]

Notes:
All ores are minerals but all minerals are not ores. Minerals are the native form in which various metals exist and ores are those minerals which are used to extract metals economically.