Chemistry

A ‘breath test’ used by traffic police to check drunken driving uses ____?

A. Turmeric on filter paper

B. Silica gel coated with silver nitrate

C. potassium permanganate-sulphuric acid

D. Potassium dichromatic-sulphuric acid

Brass gets discolored in air because of the presence of which of the following gases in air ________

A. Carbon dioxide

B. Oxygen

C. Nitrogen

D. Hydrogen sulphide

Hydrogen bomb is based on the principle of ________ ?

A. Nuclear fusion

B. Artificial radioactivity

C. Natural radioactivity

D. Nuclear fission

Proton number is denoted by symbol __________ ?

A. M

B. Z

C. P

D. A

When an acid reacts with a metal, which one of the following gas is usually liberated?

A. Ammonia Gas

B. Chlorine

C. Oxygen

D. Hydrogen gas

Permanent hardness of water due to sulphate of metals can be destroyed by the use of ________ ?

A. Zeolites

B. Sulphonides

C. Lime

D. Nitrates

What is the Chemical formula of Zinc Hydroxide _________ ?

A. Zn(OH)2

B. ZNO2

C. Zn2(OH)3

D. ZnOH

The valency of carbon Atom is __________ ?

A. 1

B. 2

C. 3

D. 4

Second name of ethyl alcohol is___________?

A. Ethene

B. Ethanol

C. Propyle

D. none

Which one of the following non-metals is not a poor conductor of electricity?

A. Sulphur

B. Selenium

C. Bromine

D. Phosphorus