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

Section – III
CHEMISTRY

Q) Which of the following is not an oxide ore?
A) Bauxite
B) Zincite
C) Pyrolusite
D) Cinnabar

Q) 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

Q) The concept of hybridisation was introduced by
A) Linus Skeling
B) Linus Pauling
C) Berzelius
D) Max Planck

Q) 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

Q) Which of the following is electron deficient molecule?
A) CH₄
B) H₂O
C) BF₃
D) NH₃

Q) In electrolytic refining of metals, the pure metal is taken as
A) anode
B) cathode
C) cathode
D) vessel

Q) Which of the following metals liberates hydrogen gas when reacted with dil. HCL?
A) Ag
B) Zn
C) Cu
D) Au

Q) The nature of non-metallic oxides is generally
A) basic
B) acidic
C) amphoteric
D) neutral

Q) 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

Q) What is the chemical formula of hydronium ion?
A) H⁺
B) O H⁺
C) O H^–
D) H₃ O⁺