General Science - Study Mode

[#76] Diamond is an allotropic form of:
Correct Answer

(B) Carbon

Explanation

Solution: Diamond and graphite are two allotropes of carbon: pure forms of the same element that differ in structure.

[#77] In fireworks, the green flame is produced because of
Correct Answer

(B) Barium

Explanation

Solution: In fireworks, the green flame is produced because of barium.

[#78] Permanent hardness of water can be removed by adding:
Correct Answer

(B) Washing Soda

Explanation

Solution: Temporary hardness is due to presence of soluble bicarbonates of calcium and magnesium and permanent hardness is due to the presence of chlorides and sulphate of calcium and magnesium.

[#79] Marsh gas is
Correct Answer

(C) Methane

Explanation

Solution: Marsh gas, swamp gas, and bog gas is a mixture of methane, hydrogen sulfide, and carbon dioxide, produced naturally within some geographical marshes, swamps, and bogs.

[#80] Monazite is an ore of
Correct Answer

(D) Thorium

Explanation

Solution: Monazite is an important ore for thorium, lanthanum, and cerium. It is often found in placer deposits.