General Science - Study Mode

[#81] Carbon, diamond and graphite are together called:
Correct Answer

(A) Allotrope

Explanation

Solution: Carbon, diamond and graphite are together called Allotrope.

[#82] Potassium nitrate is used in
Correct Answer

(B) Fertilizer

Explanation

Solution: Used in solid propellants, explosives, fertilizers. Potassium nitrate is the inorganic nitrate salt of potassium. It has a role as a fertilizer.

[#83] Permanent hardness of water may be removed by the addition of:
Correct Answer

(A) Sodium Carbonate

Explanation

Solution: Temporary hardness can be removed by boiling or by addition of Ca(OH) 2 . Permanent hardness can be removed by the addition of washing soda commonly known as sodium carbonate.

[#84] Soda water contains
Correct Answer

(A) Carbonic acid

Explanation

Solution: Carbonated water or Soda water is water that has been infused with carbon dioxide gas under pressure. It is carbonic acid. This produces a bubbly drink that's also known as sparkling water, club soda, soda water, seltzer water and fizzy water. With the exception of seltzer water, they usually have salt added to improve the taste.

[#85] The most important ore of aluminum is
Correct Answer

(D) Bauxite

Explanation

Solution: Bauxite is the most important ore of aluminum which contains only 30–54% alumina, Al 2 O 3 .