Chemistry MCQS with Answers Set 4

The substance used as a smoke screen in warfare is

PCI₅

SiCI₄

Acetylene

PH₃

Which one is not usually used for the crystallization

Acetone

Chloroform

Sulphuric acid

Acetic acid

The symbol of the element whose atoms have the outer most electronic configuration 2s² 2p³ is

Na

P

Li

N

Calcium acetate when dry distilled gives

Acetone

Acetaldehyde

Formaldehyde

Acetic anhydride

Evaporation of water is

A process accompanied by chemical

An exothermic change

A process where no heat changes occur

An endothermic change

Which of the following metal exhibits more than one oxidation?

Na

AI

Mg

Fe

When electrons revolve is stationary orbits

They are gaining kinetic energy

They vecome stationary

There is increase in energy

There is no change in energy level

When electricity is passed through molten AI₂O₃ + Na₃AIF₆ and 13.5 gms AI are deposited,the number of faraday must be

0.5

1.5

1

2

The main structure features of proteins is

An ester linkage

All

The peptide linkage

An ether linkage

At room temperature formaldehyde is

Solid

Liquid

Gas

None of the above