21)

What is the atomic mass of oxygen (expressed in ‘u’)?

SSC CGL 2022

A)

16

B)

8

C)

24

D)

32

22)

How many sodium atoms are there in one molecule of sodium peroxide?

SSC CGL 2022

A)

One

B)

Three

C)

Four

D)

Two

23)

Which of the following is NOT a chemical coagulant used in water treatment?

SSC CGL 2022

A)

Aluminium chloride

B)

Polyaluminium chloride (PAC)

C)

Aluminium sulfate (Alum)

D)

Nitrogen dioxide

24)

Saccharomyces Cerevisiae is commonly used to make ______.

SSC CGL 2022

A)

yoghurt

B)

bread

C)

cheese

D)

carbonated beverages

25)

What is the atomic number of nitrogen?

SSC CGL 2022

A)

7

B)

8

C)

6

D)

5

26)

Which of the following is a characteristics of amorphous solids?

SSC CGL 2022

A)

A definite characteristic geometrical shape

B)

Melting at a sharp and characteristic temperature

C)

A definite and characteristic enthalpy of fusion

D)

Gradual softening over a range of temperatures

27)

Which of the following techniques can be used for reducing the total dissolved solids (TDS) in water?
(1) Ion Exchange
(2) Distillation
(3) Carding

SSC CGL 2022

A)

Both 1 and 2

B)

Only 3

C)

Only 1

D)

Both 2 and 3

28)

Irrespective of the source, pure water contains ______ of oxygen by mass.

SSC CGL 2022

A)

56.83%

B)

88.89%

C)

11.11%

D)

35.42%

29)

Carbon monoxide contains approximately ______ of oxygen for each 1.00 g of carbon.

SSC CGL 2022

A)

0.23 g

B)

1.33 g

C)

2.66 g

D)

4.11 g

30)

Which of the following is a property of Beryllium?

SSC CGL 2022

A)

Reacts with water

B)

Has a low melting and boiling point

C)

Forms covalent compounds

D)

Forms ionic compounds