Chemistry MCQs

Question 1

Aerated water contains

Accepted Answer

CO2

Answer

SO2

Answer

NO2

Answer

H2

Question 2

The BOD values of water indicate the

Accepted Answer

Amount of oxygen used for biochemical oxidation

Answer

Amount of organic debris

Answer

Amount of oxygen used for biochemical reduction

Answer

Amount of ozone used for biochemical oxidation

Question 3

Iron and manganese present as pollutants in water cannot be removed by________

Accepted Answer

Chlorination

Answer

Oxidation followed by settling and filtration

Answer

Ion exchange process

Answer

Lime soda process or manganese zeolite process

Question 4

Table salt gets moist during rainy season because

Accepted Answer

Sodium chloride contains hygroscopic impurities like magnesium chloride

Answer

Sodium chloride is hygroscopic

Answer

Sodium chloride is deliquescent

Answer

Sodium chloride contains some quantity of sodium iodide

Question 5

The unit to measure the flow of water is

Accepted Answer

Cusecs

Answer

Micro Mho

Answer

Ohm meter

Answer

Milli curie

Question 6

When water itself combines chemically with some element or mineral it is called

Accepted Answer

Hydration

Answer

Carbonation

Answer

Desilication

Answer

Oxidation

Question 7

Sea water is saltier than rain water because

Accepted Answer

Rivers wash away salts from earth and pour them into the sea

Answer

Sea animals are salt producing

Answer

The air around the sea is saltish

Answer

Sea beds have salt producing mines

Question 8

In sugar solution,

Accepted Answer

Sugar is solute, water is solvent

Answer

Sugar is solvent, water is solute

Answer

Both are solutes

Answer

Both are solvents

Question 9

The metallic constituents of hard water are :

Accepted Answer

Calcium, magnesium and iron

Answer

Magnesium, calcium and tin

Answer

Iron, tin and calcium

Answer

Magnesium, tin and iron