set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Which of the following is considered to be a pure substance?

a) Muddy water

b) Sodium chloride

c) Granite

d) Milk of magnesia

Question : 2

At NTP, the least volume will be occupied by 15 g of which one of the following ?

a) $N_2$

b) N$H_3$

c) $O_2$

d) Ne

Question : 3

White gold is used in jewelry and contains two elements, gold and palladium. A jeweler has two different samples that are both identical in appearance and have a uniform composition throughout. What can be said about the samples?

a) The samples have variable compositions and are classified as metallic solutions.

b) The materials are heterogeneous mixtures and can be classified by their components

c) They are homogeneous mixtures and be classified as metallic alloys.

d) The samples are heterogeneous mixtures that can be separated using magnetic properties.

Question : 4

Kerosene is a mixture of

a) saturated hydrocarbons

b) aromatic hydrocarbons

c) aliphatic hydrocarbons

d) alicyclic hydrocarbons

Question : 5

Solutions with low concentrations of solutes are

a) solvents

b) dilute

c) concentrated

d) None of these

Question : 6

Two substances A and B when brought together form a substance C with the evolution of heat. The properties of C are entirely different from those of A and B. The substance C is

a) a mixture

b) an element

c) a compound

d) none of these.