TRB Polytechnic Model Question Paper for Chemistry - 1
Question: 1
The fluoride ore of aluminium is
(A) Cryolite
(B) Bauxite
(C) Corundum
(D) Haematite
Ans: A
Cryolite
Question: 2
Hydrogen sulphide gas has
(A) Rotten egg smell
(B) Pungent smell
(C) Fruity smell
(D) Smell
Ans: A
Rotten egg smell
Question: 3
Which of the following has valency three?
(A) Carbonate ion
(B) Chloride ion
(C) Nitrate ion
(D) Phosphate ion
Ans: D
Phosphate ion
Question: 4
Which of the following is used in the commercial vulcanization of the rubber?
(A) Phosphorus
(B) Sulphur
(C) Selenium
(D) Sulphur
Ans: D
Sulphur
Question: 5
The number of electrons present in the valence shell of nitrogen atom is
(A) 2
(B) 3
(C) 4
(D) 5
Ans: D
5
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