Chemistry Important Topics for Competitive Exams 2024-2025 - 1

Question: 1

What does the airbag, used for safety of car driver, contain?

(A) Sodium peroxide

(B) Sodium nitrite

(C) Sodium azide

(D) Sodium bicarbonate

Question: 2

Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?

(A) Carbon, hydrogen, potassium

(B) Oxygen, calcium, phosphorous

(C) Carbon, hydrogen, nitrogen

(D) Hydrogen, oxygen, sodium

Question: 3

Hydrofluoric acid is not kept in glass bottles because it reacts with

(A) Auminium oxide of glass

(B) Silicon dioxide of glass

(C) Sodium oxide of glass

(D) Visible light

Question: 4

The order of appearance of the following with increasing temperature during the refining of crude oil is

(A) Gasoline, diesel, kerosene

(B) Gasoline, kerosene, diesel

(C) Diesel, gasoline, kerosene

(D) Kerosene, gasoline, diesel

Question: 5

In the process of electroplating a utensil with zinc,

(A) The utensil is made the anode and pure zinc is made the cathode

(B) The utensil is made the cathode and pure zinc is made the anode

(C) Pure zinc is made the anode

(D) The utensil is made the cathode