nature of matter and composition - Category wise Question and Answer Practice Test with Solutions

Question : 11

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 : 12

Which of the following is a colloid ?

a) Silicic acid

b) Urea solution

c) Sugar solution

d) NaCl solution

Question : 13 [CDS]

The main component of Gobar gas is?

a) Ethylene

b) Chlorine

c) Hydrogen

d) Methene

Question : 14 [NDA]

To weld metals together, high temperature is required. Such a high temperature is obtained by burning

a) Methane in oxygen

b) Acetylene in oxygen

c) LPG in oxygen

d) Acetylene in nitrogen

Question : 15 [NDA]

Which one of the following elements shows variable equivalent mass?

a) Calcium

b) Zinc

c) Silver

d) Iron