TS Polycet (Polytechnic) 2020 Previous Question Paper with Answers And Model Papers With Complete Analysis

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Section — III
CHEMISTRY

91)Which of the following is not an oxide ore?

A) Bauxite

B) Zincite

C) Pyrolusite

D) Cinnabar

View Answer

D) Cinnabar

92)In NH3 the bond angle is deviated from normal bond angle 109°28′ is due to

A) Bond pair repulsion

B) Lone pair repulsion

C) Lone pair-bond pair repulsion

D) All the above

View Answer

C) Lone pair-bond pair repulsion

93)The concept of hybridisation was introduced by

A) Linus Skeling

B) Linus Pauling

C) Berzelius

D) Max Planck

View Answer

B) Linus Pauling

94)The correct order of reactivity of metals.

A) Na > Zn > Au > Cu

B) Zn > Na> Au > Cu

C) Na > Zn > Cu > Au

D) Au > Cu > Na> Zn

View Answer

C) Na > Zn > Cu > Au

95)Which of the following is electron deficient molecule?

A) CH4

B) H2O

C) BF3

D) NH3

View Answer

C) BF3

96)In electrolytic refining of metals, the pure metal is taken as

A) anode

B) cathode

C) cathode

D) vessel

View Answer

B) cathode

97)Which of the following metals liberates hydrogen gas when reacted with dil. HCL?

A) Ag

B) Zn

C) Cu

D) Au

View Answer

B) Zn

98)The nature of non-metallic oxides is generally

A) basic

B) acidic

C) amphoteric

D) neutral

View Answer

B) acidic

99)Which of the following equations is not balanced?

A) C + O2—->CO2.

B) 2AgCl—-> 2Ag + Cl2

C) Ca CO3 —->CaO + CO2

D) N2 + O2 —–»NO

View Answer

D) N2 + O2 —–»NO

100)What is the chemical formula of hydronium ion?

A) H+

B) O H+

C) O H–

D) H3 O+

View Answer

D) H3 O+
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