Latest Chemistry General Knowledge(GK) Questions and answers

Chemistry - General Knowledge Questions

1 .

The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

A)

3 billion years

B)

100 years

C)

0.01 minute

D)

13 days

Correct Answer : Option (C) - 0.01 minute

2 .

The mass of one Avogadro number of helium atom is

A)

1.00 gram

B)

4.00 gram

C)

8.00 gram

D)

4 x 6.02 x 10²³ gram

Correct Answer : Option (B) - 4.00 gram

3 .

The method that cannot be used for removing permanent hardness of water is

A)

adding sodium carbonate

B)

distillation

C)

adding caustic soda

D)

boiling

Correct Answer : Option (D) - boiling

4 .

The number of waves in n x 10th Bohr's orbit are

A)

n

B)

n²

C)

n^-2

D)

n³

Correct Answer : Option (A) - n

5 .

The oil used in the froth floatation process is

A)

pine oil

B)

coconut oil

C)

olive oil

D)

kerosene oil

Correct Answer : Option (A) - pine oil

6 .

The mineral containing both magnesium and calcium is

A)

magnesite

B)

calcite

C)

carnallite

D)

dolomite

Correct Answer : Option (D) - dolomite

7 .

The most malleable metal is

A)

platinum

B)

silver

C)

iron

D)

gold

Correct Answer : Option (D) - gold

8 .

The main chemical constituent of clay is

A)

silicon oxide

B)

aluminium borosilicate

C)

zeolites

D)

aluminium silicate

Correct Answer : Option (D) - aluminium silicate

9 .

The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

A)

1.568 x 10³

B)

6.023 x 10¹⁹

C)

4.84 x 10¹⁷

D)

6.023 x 10²³

Correct Answer : Option (B) -

10 .

The major constituent of air is

A)

nitrogen

B)

carbon dioxide

C)

oxygen

D)

hydrogen

Correct Answer : Option (A) - nitrogen

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