An element X has 127 neutrons and 82 electrons.
Its atomic number is?

A. 209

B. 105

C. 45

D. 82

When a bottle of Coca-Cola is opened, bubbles of gas evolve. The gas is?

A. hydrogen

B. carbon monoxide

C. carbon dioxide

D. sulphur oxide

E. chlorine

When glowing splint is inserted into the mouth of a jar containing a gas, the splint is extinguished. The gas gives a white precipitate when passing into barium hydroxide. The gas is?

A. methane

B. hydrogen chloride

C. hydrogen

D. nitrogen

E. carbondioxide

An example of a strong electrolyte is?

A. ethyl acetate

B. ethanol

C. glucose

D. sodium formate

E. formic acid

The oxidation number of manganese in KMnO₄ is?

A. +1

B. +3

C. +5

D. +7

E. +2

Methane is member of the homologous series called?

A. alkenes

B. alcohols

C. esters

D. alkanes

E. alkynes

For iron to rust, there should be present?

A. oxygen

B. moisture

C. carbondioxide

D. oxygen and moisture

E. oxygen, moisture and carbondioxide

The mass number of an atom is?

A. the number of electrons in the atom

B. the number of protons in the nucleus of the atom

C. the number of neutrons in the nucleus of the atom

D. the sum of numbers of electrons and protons inthe atom

E. the sum of numbers of proton and neutrons in the nucleus of the atom

Sodium and potassium belong to the same group of the Periodic Table. This is because?

A. both are metals

B. both are soft and lighter than water

C. both form cations by losing electrons

D. both have identical electronic configuration

E. both react with water vigorously

Oxidation is the process of?

A. gain of electrons

B. loss of electrons

C. gain of hydrogen

D. loss of oxygen

E. addition of an electropositive element to a substance