Tag: chemistry

Questions Related to chemistry

Which of the following imparts purple colour to glass?

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

  1. ${Cr} _{2}{O} _{3}$

  2. $Au{Cl} _{3}$

  3. ${Cu} _{2}O$

  4. $Mn{O} _{2}$

Show answer
Correct Option: D
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.

Which of the following is not an ingredient of clinker?

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

  1. Calcium silicate

  2. Aluminium silicate

  3. Calcium aluminium silicate

  4. Gypsum

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Correct Option: D
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. 

Potash alum is widely used in:

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

  1. water treatment

  2. air treatment

  3. land treatment

  4. all of the above

Show answer
Correct Option: A
Explanation:

Potash alum is widely used in water treatment plant for clarification of water.

Sodium hydroxide is used in the manufacture of:

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

  1. pulp and paper

  2. textiles

  3. soap and detergents

  4. all of the above

Show answer
Correct Option: D
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.

What is used in photography for developing films?

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

  1. Silver nitrate

  2. Silver bromide

  3. Silver iodide

  4. Silver chloride

Show answer
Correct Option: B,D
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. 

Which of the following is used in the manufacture of gun powder?

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

  1. Chile saltpetre

  2. Nitre

  3. Both A and B

  4. None of the above

Show answer
Correct Option: C
Explanation:

Chile saltpetre(Sodium nitrate), is a deliquescent crystalline sodium salt. Nitre is potassium nitrate. They are used in the manufacture of gun powder, nitric acid etc. It is a mixture of sulfur, charcoal, and potassium nitrate (saltpeter).

Common salt besides being used in kitchen can also be used as the raw material for making:
(i) washing soda
(ii) bleaching powder
(iii) baking soda
(iv) slaked lime

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

  1. (i) and (ii)

  2. (i), (ii) and (iv)

  3. (i) and (iii)

  4. (i), (iii) and (iv)

Show answer
Correct Option: C
Explanation:

A. Baking soda is sodium hydrogen carbonate which is prepared by Solvay process which is the reaction of sodium chloride,ammonia and carbon dioxide in water. The calcium carbonate is used in the reaction to get carbon dioxide gas.
${ CaCO } _{ 3 }\rightarrow CaO+{ CO } _{ 2 }\ { 2NH } _{ 3 }+{ CO } _{ 2 }+{ H } _{ 2 }O\rightarrow \left( { NH } _{ 4 } \right) _{ 2 }{ CO } _{ 3 }+{ CO } _{ 2 }+{ H } _{ 2 }O\rightarrow { NH } _{ 4 }{ HCO } _{ 3 }\ { NH } _{ 4 }{ HCO } _{ 3 }+NaCl\rightarrow { NaHCO } _{ 3 }+{ NH } _{ 4 }Cl$
B. Washing soda is sodium carbonate which is prepared from the sodium chloride.
$2NaCl+{ CaCO } _{ 3 }\rightarrow { Na } _{ 2 }{ CO } _{ 3 }+Ca{ Cl } _{ 2 }$

 Column A  Column B
 A. Bleaching powder  i. Preparation of glass
 B. Baking soda  ii. Production of $H _2$ and $Cl _2$
 C. Washing soda  iii. Decolourisation
 D. Sodium chloride  iv. Antacid

Match the chemical substances given in Column (A) with their appropriate application given in Column (B).

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

  1. A(ii), B(i), C(iv), D(iii)

  2. A(iii), B(ii), C(iv), D(i)

  3. A(iii), B(iv), C(i), D(ii)

  4. A(ii), B(iv), C(i), D(iii)

Show answer
Correct Option: C
Explanation:

A. Bleaching powder is calcium hypochlorite
${ 2CaOCl } _{ 2 }+{ H } _{ 2 }{ SO } _{ 4 }\rightarrow { CaCl } _{ 2 }+{ CaSO } _{ 4 }+2HClO\ HClO\rightarrow HCl+\left[ O \right] \xrightarrow { Coloured\quad matter } Colourless\quad product$
B. Baking soda is sodium bicarbonate which is basic in nature and used as an antacid.
${ NaHCO } _{ 3 }$
C. Sodium carbonate which has a common name washing soda, a monohydrate which is used in the preparation of glass. It is used to flux silica by lowering down the temperature.
Two forms of sodium carbonate are used i.e heavy and light. The light form is obtained first and is converted to heavy form. The heavy form is is used as a solid in making glass where it is used as flux in the melting of silica.${ Na } _{ 2 }{ CO } _{ 3 }\cdot { H } _{ 2 }O$
D. The electrolysis of aqueous solution of sodium chloride gives hydrogen at the cathode and chlorine at the anode. This solution is called as the brine solution. It helps in the evolution of hydrogen gas and chloride gas.

State True or False.
Decomposition of calcium phosphate present in bone ash with concentrated sulphuric acid produces phosphoric acid.
chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Bone ash is Tricalcium phosphate in the form of hydroxyapatite ${ Ca } _{ 5 }\left( OH \right) { \left( P{ O } _{ 4 } \right)  } _{ 3 }$. Phosphoric acid is obtained from hydroxyapatite when treated with sulphuric acid.
$2{ Ca } _{ 5 }{ \left( P{ O } _{ 4 } \right)  } _{ 3 }OH+10{ H } _{ 2 }S{ O } _{ 4 }+18{ H } _{ 2 }O\longrightarrow 6{ H } _{ 3 }P{ O } _{ 4 }+10CaS{ O } _{ 4 }.2{ H } _{ 2 }O$

Match the compounds /metal in $(X)$ with their uses in $(Y)$.

$X$ $Y$
$A.$ Liquid sodium metal $I.$ Breathing apparatus in submarine
$B.$ Potassium stearate $II.$ Explosive
$C.$ Potassium nitrate $III.$ Coolant in nuclear reaction
$D.$ Potassium superoxide $IV.$ Soft soap
chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

  1. $A-I\, \quad\, B-III\, \quad\, C- II\, \quad\, D- IV$

  2. $A-III\, \quad\,B-  IV\, \quad\,C-  II\, \quad\, D- I$

  3. $A- II\, \quad\,B- I\, \quad\, C- III\, \quad\, D- IV$

  4. $A- IV\, \quad\, B- II\, \quad\, C- III\, \quad\,D-  I$

Show answer
Correct Option: B
Explanation:

1. Liquid sodium metal is used as coolant in nuclear reaction
2. Potassium stearate is used in soft soap
3. Potassium nitrate is explosive
4. Potassium superoxide, which gives off oxygen as it absorbs carbon dioxide is used in Breathing apparatus in submarine