91
Bleaching powder is not used for:
A)
oxidising chemicals
B)
preparing bread
C)
bleaching cotton
D)
disinfecting water
Answer & Solution
Answer: Option
B
92
What is deposited on iron in the process of galvanisation?
A)
Copper
B)
Zinc
C)
Tin
D)
Aluminium
Answer & Solution
Answer: Option
B
93
Which of the following metals, if kept in open, immediately ignites a fire?
A)
Lead and silver
B)
Magnesium
C)
Gold and Silver
D)
Sodium and potassium
Answer & Solution
Answer: Option
D
94
Which of the following metals is stored in kerosene oil?
A)
platinum
B)
copper
C)
sodium
D)
gold
Answer & Solution
Answer: Option
C
95
Who discovered stainless steel?
A)
William Howard Lievens
B)
Joseph Aspadin
C)
Harry Bearley
D)
James Dysne
Answer & Solution
Answer: Option
C
96
. . . . . . . . reacts vigorously with water to form slaked lime.
A)
CaCl2
B)
CaO
C)
CaCO3
D)
Ca(OH)2
Answer & Solution
Answer: Option
B
97
When electricity is passed through an aqueous (saline) solution of sodium chloride, it decomposes into which of the following:
A)
NaOH + H2 + Cl2
B)
NaOH + H2 + O2
C)
NaOH + HCl + H2
D)
NaOH + H2 + N2
Answer & Solution
Answer: Option
A
98
Match
List I with
List II .
List-I List-II
a. Haematite
1. Aluminium
b. Cassiterite
2. Tin
c. Cryolite
3. Silver
d. Argentite
4. Iron
A)
a-4, b-2, c-1, d-3
B)
a-2, b-1, c-3, d-4
C)
a-1, b-3, c-4, d-2
D)
a-3, b-4, c-2, d-1
Answer & Solution
Answer: Option
A
99
Which one among the following chemicals is used as washing soda?
A)
Calcium carbonate
B)
Calcium bicarbonate
C)
Sodium carbonate
D)
Sodium bicarbonate
Answer & Solution
Answer: Option
C
100
The chemical formula of the Plaster of Paris is
A)
CaSO4
B)
$$CaS{O_4} \cdot \frac{1}{2}{H_2}O$$
C)
$$CaS{O_4} \cdot {H_2}O$$
D)
$$CaS{O_4} \cdot 2{H_2}O$$
Answer & Solution
Answer: Option
B
