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

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TS POLYCET 2025
Section — C
CHEMISTRY

91)The law of octaves was proposed by:

A) Dmitri Mendeleev

B) John Newlands

C) Lothar Meyer

D) J.J. Thomson

View Answer

B) John Newlands
Explanation:Law of octaves was proposed by John Newlands
92)Which of the following methods is used for the concentration of ore?

A) Electrolysis

B) Froth flotation

C) Distillation

D) Sublimation

View Answer

B) Froth flotation
Explanation:Froth flotation is used for concentrating sulphide ores
93)The purification method used for blister copper is:

A) Electrolytic refining

B) Zone refining

C) Distillation

D) Poling

View Answer

D) Poling
Explanation:Blister copper is purified by poling process
94)What is the nature of a solution whose pH value is zero?

A) Neutral

B) Acidic

C) Basic

D) Amphoteric

View Answer

B) Acidic
Explanation:pH = 0 ⇒ strongly acidic solution
95)Identify the sulphide ore among the following:

A) Hematite

B) Galena

C) Magnetite

D) Bauxite

View Answer

B) Galena
Explanation:Galena (PbS) is a sulphide ore
96)The product or products formed when sodium carbonate reacts with HCl is/are:

A) Sodium chloride and carbon dioxide

B) Sodium bicarbonate and carbon dioxide

C) Sodium chloride, carbon dioxide, and water

D) All of the above

View Answer

D) All of the above
Explanation:Na2CO3 + HCl gives NaCl, CO2 and H2O (stepwise reactions possible)
97)IUPAC name of CH\(_3\)CHO is:

A) Ethanol

B) Acetaldehyde

C) Propanol

D) Butanal

View Answer

B) Acetaldehyde
Explanation:CH3CHO is ethanal (acetaldehyde)
98)Which of the following is the hardest material?

A) Diamond

B) Graphene

C) Iron

D) Silicon carbide

View Answer

A) Diamond
Explanation:Diamond is hardest natural substance
99)The below reaction is an example of:

A) Hydrogenation

B) Halogenation

C) Hydrolysis

D) Addition

View Answer

D) Addition
Explanation:Addition of hydrogen (H2) ⇒ hydrogenation (also an addition reaction)
100)The hybridisation of carbon in graphite is:

A) sp

B) sp\(^2\)

C) sp\(^3\)

D) sp\(^3\)d

View Answer

B) sp\(^2\)
Explanation:Graphite has sp² hybridisation
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