Chemistry - Study Mode

[#66] What is a Bakelite ?
Correct Answer

(D) Polymer

Explanation

Solution: Bakelite is a polymer.

[#67] What happens when a drop of glycerol is added to crushed KMnO 4 spread on a paper ?
Correct Answer

(B) There is a violent explosion.

Explanation

Solution: When solid Potassium Permanganate (KMnO 4 ) is mixed with pure glycerol or other simple alcohols, it will result in a violent combustion reaction. Potassium Permanganate is an extremely powerful oxidizer which spontaneously ignites after coming in contact with glycerol. The glycerol is oxidized so quickly that heat is generated faster than it can be dissipated.

[#68] Silver nitrate solution is kept in brown bottles in laboratory because
Correct Answer

(B) Brown bottles stops the passage of light through it

Explanation

Solution: Silver nitrate decomposes in presence of sunlight. To prevent this decomposition, silver nitrate is placed in brown colour bottles as sunlight cannot pass through brown colour bottles.

[#69] Which colour is produce by Arsenic during flame test?
Correct Answer

(D) Blue

Explanation

Solution: Blue colour is produce by Arsenic during flame test.

[#70] Which of the following is a renewable source of energy ?
Correct Answer

(B) Geothermal power

Explanation

Solution: Renewable resources include biomass energy (such as ethanol), hydropower, geothermal power, wind energy, and solar energy.