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TS Polycet (Polytechnic) 2015 Previous Question Paper with Answers And Model Papers With Complete Analysis

111)The impurities present in the ore are called

A) gangue

B) slag

C) mineral

D) flux

View Answer

A) gangue

112)Which one of the following represents calcination?

A) CaO + CO₂ → CaC0₃

B) 2PbS + 2O₂ $\xrightarrow\bigtriangleup$ 2PbO + 2SO₂

C) PbO + C $\xrightarrow\bigtriangleup$ Pb + CO

D) Fe₂O₃.3H₂O $\xrightarrow\bigtriangleup$ Fe₂O₃ + 3H₂O

View Answer

D) Fe₂O₃.3H₂O $\xrightarrow\bigtriangleup$

Fe₂O₃ + 3H₂O

113)In electrolysis, the reaction that takes place at cathode is

A) oxidation

B) reduction

C) redox reaction

D) none

View Answer

B) reduction

114)The chemical bonds present in C₂H₂ are

A) 2 sigma and 3 pi

B) 1 sigma and 2 pi

C) 3 sigma and 2 pi

D) 2 sigma and 1 pi

View Answer

C) 3 sigma and 2 pi

115)n-butane and isobutane are

A) structural isomers

B) functional isomers

C) stereo isomers

D) geometrical isomers

View Answer

A) structural isomers

116)In combustion of alkane the heat energy is

A) absorbed

B) liberated

C) neither absorbed nor liberated

D) depends on alkane

View Answer

B) liberated

117)IUPAC name of Cl₃C-CH₂-CHO is

A) 3, 3, 3 – trichloropropanal

B) 3, 3, 3 – trichloropropanol

C) 1,1, 1 – trichloropropanol

D) 1, 1, 1 – trichloropropanal

View Answer

A) 3, 3, 3 – trichloropropanal

118)Which of the following substances gives shiny finish to the walls when the walls are white washed?

A) CaO

B) CaCl₂

C) CaCO₃

D) Ca(HCO₃)₂

View Answer

C) CaCO₃

119)Rusting of Iron is

A) reduction process

B) oxidation process

C) chemical de-composition

D) none of the above

View Answer

B) oxidation process

120)Match the following:

Column – A	Column – B
(a) Oxidation	i. Prevent corrosion
(b) CaO + H<sub>2</sub>O → Ca(OH)<sub>2</sub>	ii. Chemical decomposition
(c) CaCO<sub>3 </sub>→ CaO + CO<sub>2</sub>	iii. Chemical combination
(d) Isolation of metal from O<sub>2</sub> and moisture	iv. Loss of electrons

—(a) (b) (c) (d)

A) (i) (ii) (iii) (iv)

B) (iv) (iii) (i) (ii)

C) (iv) (iii) (ii) (i)

D) (iii) (iv) (ii) (i)

View Answer

Explanation:
—(a) (b) (c) (d)
C) (iv) (iii) (ii) (i)

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