Set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Pure gold is –

a) 20 carats

b) 24 carats

c) 22 carats

d) 18 carats

Question : 2

Which of the following have low melting and boiling points?

a) Iron

b) Phosphorus

c) Sodium

d) Both (b) and (c)

Question : 3

Which of the following statement regarding non-metals is true?

a) Non-metals are non-lustrous with dull apppearence. Graphite, an allotrope of carbon and iodine have shining lustrous surfaces.

b) Non-metals are of two types only solids and gases.

c) Non-metals reacts with oxygen to form basic oxides generally.

d) Non-metals replace hydrogen from acids.

Question : 4

Which one of the following metals is liquid at ordinary temperature?

a) Nickel

b) Mercury

c) Lead

d) Tin

Question : 5

The softest mineral, Talc (Soapstone) is mainly

a) Sodium Silicate

b) Sodium Phosphate

c) Manganese Silicate

d) Magnesium Silicate

Question : 6

Which of the following statements regarding non-metals is false?

a) The black material inside a pencil is metal lead.

b) 11 non-metals are in gaseous state.

c) Gas carbon is a good conductor of heat and electricity.

d) All non-metals are non-sonorous in nature.