TS Polycet (Polytechnic) 2021 Previous Question Paper with Answers And Model Papers With Complete Analysis

116) Which one of the following is an acidic oxide

A) Mgo
B) Na₂O
C) CaO
D) CO₂

View Answer

D) CO₂

Explanation:CO₂forms carbonic acid in water → it is an acidic oxide.
Answer: CO₂

117) Metallic oxides are generally …… in nature

A) acidic
B) neutral
C) amphoteric
D) basic

View Answer

D) basic

Explanation:Metallic oxideslike Na₂O, CaO, MgO are generally basic.
Answer: Basic

118) The nature of chemical in antacid is

A) Basic
B) Acidic
C) Neutral
D) All the above

View Answer

A) Basic

Explanation:Antacidsneutralize excess acid → they are basicin nature.
Answer: Basic

119) pH value of aqueous NaCl solution is

A) 1.7
B) 2
C) 10
D) 7

View Answer

D) 7

Explanation:NaClis a neutral salt → aqueous solution has pH = 7
Answer: 7

120) The chemical formula of blue coloured Copper Sulphate crystal is,

A) CuSO₄.H₂O
B) CuSO₄.2H₂O
C) CuSO₄.5H₂O
D) CuSO₄.10H₂O

View Answer

C) CuSO₄.5H₂O

Explanation:Blue copper sulphatecrystals = CuSO₄·5H₂O(pentahydrate)
Answer: CuSO₄·5H₂O

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