[VSQ]Chemistry Q&A For All Competitive Exam||Set 14

Chemistry Q&A For All Competitive Exam

✱✱Q1.

The most abundant element in the earth's crust is ?

⇒Oxygen

✱✱Q2.

The lustre of a metal is due to _______ .

⇒Presence of free electrons

✱✱Q3.

Which gas is used in fire extinguisher?

⇒Carbon dioxide

✱✱Q4.

Which gas is used in cigarette lighters?

⇒Butane

✱✱Q5.

Paraffin wax is _________ .

⇒Saturated hydrocarbon

✱✱Q6.

Solder is an alloy of _____ .

⇒Tin and Lead

✱✱Q7.

Alum is used as

⇒A purifier for water

✱✱Q8.

Nuclear fuel in the sun is ______ .

⇒Helium

✱✱Q9.

Hydrogen bomb is based on the principle of _____ .

⇒Nuclear fusion

✱✱Q10.

The ultrapure metal is obtained by _____ .

⇒Zone refining

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