TS POLYCET 2025 Question Paper with Solutions Free (Set-wise Answer Key)

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111)The compound used in the preparation of borax is:

A) Sodium carbonate

B) Sodium chloride

C) Washing soda

D) Sodium tetraborate

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C) Washing soda
Explanation:Borax is prepared using washing soda

112)What is the molecular formula of alkane?

A) C\(_n\)H\(_{2n+2}\)

B) C\(_3\)H\(_8\)

C) C\(_n\)H\(_{2n}\)

D) C\(_n\)H\(_{2n-2}\)

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A) C\(_n\)H\(_{2n+2}\)
Explanation:General formula of alkanes = CnH2n+2

113)Shape of H\(_2\)O molecule is:

A) Linear

B) Bent or V-shaped

C) Trigonal planar

D) Tetrahedral

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B) Bent or V-shaped
Explanation:H2O has bent shape due to lone pairs

114)Polar covalent bond is present in:

A) H\(_2\)

B) O\(_2\)

C) HCl

D) N\(_2\)

View Answer

C) HCl
Explanation:HCl has polar covalent bond due to electronegativity difference

115)An orbital can hold only two electrons. This can be explained:

A) By Pauli's exclusion principle

B) By Hund's rule

C) By Bohr's rule

D) By Heisenberg's uncertainty principle

View Answer

A) By Pauli's exclusion principle
Explanation:Pauli's exclusion principle: max 2 electrons per orbital

116)The number of magnetic quantum number values for \( l = 1 \) is:

A) 1

B) 3

C) 5

D) 7

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B) 3
Explanation:For l = 1 ⇒ m = -1, 0, +1 ⇒ total 3 values

117)Which type of atoms form cations easily?

A) Atoms with high ionization energy

B) Atoms with low ionization energy

C) Atoms with high electronegativity

D) Atoms with small atomic size

View Answer

B) Atoms with low ionization energy
Explanation:Low ionization energy ⇒ electrons lost easily ⇒ cations

118)Atoms with low ionization potential and large atomic size:

A) Form cations easily

B) Form anions easily

C) Are unstable

D) Are non-reactive

View Answer

A) Form cations easily
Explanation:Large size + low ionization energy ⇒ forms cations

119)The volume of CO\(_2\) liberated in litres at STP when 25 g of CaCO\(_3\) is treated with dilute HCl containing 14.6 g of HCl is:

A) 22.4 L

B) 11.2 L

C) 4.48 L

D) 44.8 L

View Answer

C) 4.48 L
Explanation:CaCO3 + 2HCl → CaCl2 + CO2 + H2O
25 g CaCO3 = 0.25 mol
⇒ CO2 = 0.25 mol
Volume = 0.25 × 22.4
= 4.48 L

120)Which one of the following processes involves chemical change?

A) Melting of ice

B) Boiling of water

C) Respiration

D) Dissolving salt in water

View Answer

C) Respiration
Explanation:Respiration is a chemical change (new substances formed)

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