Tag: some useful compounds in everyday life

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Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

A mixture of sand, salt and water can be separated by using which of the following processes?

  1. Only evaporation

  2. Only sedimentation

  3. Decantation and filtration

  4. Filtration, evaporation and condensation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

First by filtration sand can be separated from the mixture of sand, salt and water. Then by evaporation the water will get evaporated leaving behind the salt. The evaporated vapours can be collected and condensed to get water.

Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

The main use of salt in the diet is to:

  1. make the taste of food better

  2. produce in small amounts the hydrochloric acid required for the digestion of food

  3. ease the process of cooking

  4. increase the solubility of food particles in water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Salt plays a primary role in the process of digestion and absorption. Salt plays a role in digestion by helping to break down food. It creates hydrochloric acid which is very important digestive secretion lining the stomach walls. Salt helps the body to digest food.

Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

Gypsum is added to cooled clinker during cement manufacture:

  1. because gypsum permits formation of fine powder

  2. to delay the initial setting time of cement

  3. to increase the hardening of cement

  4. to increase the strength of set concrete
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gypsum is a mineral and is hydrated calcium sulfate in chemical form. Gypsum plays a very important role in controlling the rate of hardening of the cement. During the cement manufacturing process, upon the cooling of clinker, a small amount of gypsum is introduced during the final grinding process.

Gypsum is added to control the “setting of cement”. If not added, the cement will set immediately after mixing of water leaving no time for concrete placing.

Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

Gypsum is added to cement because:

  1. it makes the cement very hard

  2. it increases the pace of setting of cement

  3. it slows down the initial setting of cement when water is added

  4. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Gypsum plays an important role in controlling the rate of hardening of the cement. During cement manufacturing process upon cooling of clinker a small amount of gypsum is added during the final grinding process. Gypsum controls the setting of the cement and if not added the cement will set immediately leaving no time for concrete placing.

Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

Which of the following imparts purple colour to glass?

  1. ${Cr} _{2}{O} _{3}$
  2. $Au{Cl} _{3}$
  3. ${Cu} _{2}O$
  4. $Mn{O} _{2}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 $MnO _2$which is black, is used to remove the green color from the glass and imparts purple tint to the glass. $Cr _2O _3$ imparts dark green colour, $Cu _2O$ produces a turquoise color, and $AuCl _3$ gives ruby red coloured glass.

Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

Which of the following is not an ingredient of clinker?

  1. Calcium silicate

  2. Aluminium silicate

  3. Calcium aluminium silicate

  4. Gypsum
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the manufacture of Portland cement, clinker occurs as lumps or nodules, usually $3: mm \ (0.12: in)$ to $25\ mm (0.98: in)$ in diameter, produced by sintering (fused together without melting to the point of liquefaction) limestone and alumino-silicate materials such as clay during the cement kiln stage. Gypsum is not present in it. 

Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

Sodium hydroxide is used in the manufacture of:

  1. pulp and paper

  2. textiles

  3. soap and detergents

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sodium hydroxide is used in many industries, mostly as a strong chemical base in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents and as a drain cleaner.

Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

What is used in photography for developing films?

  1. Silver nitrate

  2. Silver bromide

  3. Silver iodide

  4. Silver chloride
Reveal answer Fill a bubble to check yourself
B,D Correct answer
Explanation

Light sensitive compounds are used in photography for developing films. Halides of silver like silver chloride and silver bromide shows such kinds of properties therefore used in photography.