Objective General Knowledge

Q. Enthalpy of a compound is equal to
1 heat of combustion
2 heat of formation
3 heat of reaction
4 heat of sublimation
Ans: 2

Q. Enamel is
1 a hardened transparent coating of paint
2 a glossy coating fused to the surface of a metal, glass or pottery
3 a kind of clay mixed with pigments
4 none of above
Ans: 2

Q. Elements that show the properties of both metals and non metals are called
1 allotropes
2 metalloids
3 alloys
4 colloids
Ans: 2

Q. During dehydration, the substance that the body usually loses is
1 sugar
2 sodium chloride
3 calcium phosphate
4 potassium chloride
Ans: 2

Q. Distillation at reduced pressure is used for liquids which have
1 high boiling points
2 low boiling points
3 high volatility
4 decomposed before their boiling points
Ans: 4

Q. During a chloride test, white fumes are produced due to formation of
1 ammonium chloride
2 ammonium nitrate
3 silver nitrate
4 none of these
Ans: 1

Q. Distillation the reduced pressure is used for liquids which have
1 Crystalline
2 amorphous
3 chemical
4 alkaline
Ans: 1

Q. Diamond is the_______ form of carbon
1 crystalline
2 amorphous
3 chemical
4 alkaline
Ans: 1

Q. Diamond is an example of
1 molecular crystal
2 ionic crystal
3 covalent crystal
4 metallic crystal
Ans: 3

Q. Detergents Produce lather with hard water because
1 they are soluble in hard water
2 they are colorless substances
3 the calcium and magnesium salts of sulphonic acids are soluble in water
4 they form sodium carbonate with hard water
Ans: 3