TS Polycet (Polytechnic) 2019 Previous Question Paper with Answers And Model Papers With Complete Analysis

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Section — III
Chemistry

91)Quick lime + water—–>’X’

A) CaCl2

B) CaO

C) Ca(OH)2

D) CaCO3

View Answer

C) Ca(OH)2
Explanation:CaO + 2H2O —–> Ca(OH)2 + H2

92)Which of the following is not a correct symbol, for expressing characteristics of substance in a chemical equation?

A) s = solid

B) l = liquid

C) g = gas

D) p = precipitate

View Answer

D) p = precipitate
93)In the below equation, the values of ‘x’ and ‘y’ are:

A) 5,6

B) 5,3

C) 3,5

D) 6,5

View Answer

B) 5,3
Explanation:C3H8 + 5O2</sub —–> 3CO2 + 4H2O
x = 5, y = 3

94)Which one of the following is not a base?

A) HCOOH

B) NaOH

C) KOH

D) Mg(OH)2

View Answer

A) HCOOH

95)When a metal carbonate reacts with acid, the products are

A) Salt + H3O+

B) Salt + H2O + CO2

C) Salt + H2

D) Salt + H2O + H2

View Answer

B) Salt + H2O + CO2

96)On mixing with water, plaster of paris turns into

A) CuSO4 . 5H2O

B) CaSO4 . 2H2O

C) CuSO4

D) CaSO4. 1/2h2O

View Answer

B) CaSO4 . 2H2O

97)Tooth decay starts when the ‘pH’ of the mouth is

A) below 5.5

B) between 5.5 – 7

C) between 7 -7.5

D) beyond 7.5

View Answer

A) below 5.5

98)’n’ and T values for the electron in ‘2p’ subshell are

A) n = 2, l = 0

B) n = 1, l = 0

C) n = 2, l = 1

D) n = 1, l = 1

View Answer

C) n = 2, l = 1

99)Which element has the electronic configuration 1s2 2s22p63s23p5?

A) Si

B) S

C) P

D) Cl

View Answer

D) Cl

100)The maximum number of electrons in a subshell is given by

A) 2 (2l + 1)

B) 2l+ 1

C) n + 1

D) 2 n2

View Answer

A) 2 (2l + 1)
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