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

Q). The impurities present in the ore are called
A) gangue
B) slag
C) mineral
D) flux

Q). Which one of the following represents calcination?
A) CaO + CO₂ → CaC0₃
B) 2PbS + 2O₂ 2PbO + 2SO₂
C) PbO + C Pb + CO
D) Fe₂O₃.3H₂O Fe₂O₃ + 3H₂O

Q). In electrolysis, the reaction that takes place at cathode is
A) oxidation
B) reduction
C) redox reaction
D) none

Q). 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

Q). n-butane and isobutane are
A) structural isomers
B) functional isomers
C) stereo isomers
D) geometrical isomers

Q). In combustion of alkane the heat energy is
A) absorbed
B) liberated
C) neither absorbed nor liberated
D) depends on alkane

Q). 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

Q). 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

Q). Rusting of Iron is
A) reduction process
B) oxidation process
C) chemical de-composition
D) none of the above

Q). Match the following:

—(a) (b) (c) (d)
1) (i) (ii) (iii) (iv)
2) (iv) (iii) (i) (ii)
3) (iv) (iii) (ii) (i)
4) (iii) (iv) (ii) (i)