set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

Which one of the following elements shows variable equivalent mass?

a) Calcium

b) Zinc

c) Silver

d) Iron

Question : 3

Compounds

a) contain only one type of element

b) can be separated by their physical properties

c) are the same as mixtures

d) are different kinds of atoms chemically combined with each other.

Question : 4

Which of the following is a colloid ?

a) Silicic acid

b) Urea solution

c) Sugar solution

d) NaCl solution

Question : 5

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 : 6

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