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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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