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

96) The correct set of four quantum number values for the valence electron of sodium atom is

A) n=3,1=1,m=1,s= $-\frac12$
B) n=3,1=0,m=0,s= $+\frac12$
C) n=3,1=0,m=1,s= $+\frac12$
D) n=3,1=1,m=0,s= $-\frac12$

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B) n=3,1=0,m=0,s= $+\frac12$

Explanation:Sodium’s valence electron: atomic number 11 → electron in 3s¹ ⇒n = 3, l = 0, m = 0, s = +½
Answer: n=3, l=0, m=0, s=+½

97) The impurities present in the ore is called as

A) Flux
B) Gangue
C) Slag
D) Mineral

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B) Gangue

Explanation:Impurities in ore = gangue
Answer: Gangue

98) Which of the following is used as a flux in the smelting of Haematite

A) SiO₂
B) CaSiO₃
C) CaCO₃
D) FeSiO₃

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C) CaCO₃

Explanation:In smelting haematite, CaCO₃acts as a fluxto remove SiO₂.
Answer: CaCO₃

99) Potassium and Calcium belongs to

A) s-block elements
B) p-block elements
C) d-block elements
D) f-block elements

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A) s-block elements

Explanation:Potassium (K) and Calcium (Ca) are in Group 1 and 2 respectively → s-block
Answer: s-block elements

100) Which of the following is an ore of Iron

A) Bauxite
B) Haematite
C) Carnallite
D) Pyrolusite

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B) Haematite

Explanation:Haematite (Fe₂O₃)is an important ore of iron.
Answer: Haematite

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