TS Polycet (Polytechnic) 2022 Previous Question Paper with Answers And Model Papers With Complete Analysis

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111) In endothermic reaction, hear is

A) released

B) not changes

C) absorbed

D) all of the above

View Answer

C) absorbed
Explanation:Endothermic = heat absorbed
112) One mole of Propane (C3H8) on combination given ‘x’ kilo joules at STP. Heat liberated by the combustion of 11.2 litres of Propane at STP in kilo joules is

A) X

B) \frac X2

C) 11.2X

D) 2X

View Answer

B) \frac X2
Explanation:1 mole = 22.4 L → 11.2 L = 0.5 mol → Energy = X/2
113) A Na+BH2O→CNaOH2+DH2, in this equation the values of A,B,C and D are

A) A=1,B=1,C=2,D=1

B) A=2,B=2,C=2,D=1

C) A=1,B=1,C=1,D=1

D) A=2,B=1,C=2,D=1

View Answer

B) A=2,B=2,C=2,D=1
Explanation:Balanced equation: 2Na + 2H₂O → 2NaOH + H₂
A=2, B=2, C=2, D=1
114) Compound formed when excess CO2 is passed through lime water

A) Ca(OH)2

B) CaCO3

C) Cao

D) Ca(HCO3)2

View Answer

D) Ca(HCO3)2
Explanation:Excess CO₂ + lime water → Ca(HCO₃)₂
Ca(HCO₃)₂
115) Mixing acid to water is

A) exothermic reaction

B) endothermic reaction

C) neutralization

D) none of the above

View Answer

A) exothermic reaction
Explanation:Mixing acid with water is exothermic
exothermic reaction
116) Bleaching powder is formed from

A) Slaked lime + HCl

B) Slaked lime + Cl2

C) Quick lime + HCl

D) Quick lime + CO2

View Answer

B) Slaked lime + Cl2
Explanation:Bleaching powder = Ca(OH)₂ + Cl₂
Slaked lime + Cl₂
117) Maximum number of electrons present in an orbital of atom is

A) 8

B) 6

C) 10

D) 2

View Answer

D) 2
Explanation:Max electrons in 1 orbital = 2 (Pauli exclusion principle)
118) Bases can give _____ ions in water

A) H+

B) OH–

C) H3O+

D) OH+

View Answer

B) OH–
Explanation:Bases release OH⁻ ions in water
OH⁻
119) Colour of anhydrous CuSO4 is

A) White

B) Blue

C) Green

D) Yellow

View Answer

A) White
Explanation:Anhydrous CuSO₄ is white
120) Washing Soda is used in ____

A) Glass, paper industry

B) Manufacture of borax

C) Cleaning agent for domestic purpose

D) All of the above

View Answer

D) All of the above
Explanation:Washing soda (Na₂CO₃·10H₂O) used in all mentioned applications
All of the above
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