YSA Model Paper 

Subject: Chemistry X                                 Time Allowed 3.00 hours  

Answer Key

PART- B

Q. No.1

a)HCOOH à CO + H₂O

(COOH)₂ à CO+ CO₂ + H₂O

b)CO

c)CO + Cl2 à COCl₂

 

Q. No.2

a)400-450C

Fe₂O₃/ Al₂O₃

200atm

N₂ + 3H₂ à 3H₂

b)2NH₃ + H₂SO₄ à (NH₄)₂SO₄

 

Q.No.3

a). Page 157 & 158 (Mercury Cell)

b). Page 158

c). Page 158

 

 

Q. No4.

a). 142

b).        Cl₂ + H₂O à HCl + HOCl

            HOCl à HCl + [O]

 

c). FeCl₂ + Cl₂ à FeCl₃

 

Q. No5.

a). Page 136

b).Page 136

 

Q. No. 6

a) Page No. 103

b). Page No.103

c). Page No.104

 

Q. No. 7

a). Page No.16

b). Page No.17

c). Page No.17

 

Q. No. 8

a). Page No.111 & 112

b ). Page No.110

 

Q. No. 9

a). Page No.37

b). Page No.38

c). Page No.39

 

Q. No. 10

a). iron and Steam

b). Fe₂O₃

c). 3Fe + 4 H₂O à Fe₃O₄ + 4H₂

 

Q. No. 11

a). Page No. 151

b). Page No.151

c). Page No.152

 

Q. No. 12

a). C + H₂O à CO + H₂

b). CaH₂ + H₂O à Ca(OH)₂ + H₂

c). 3Fe + 4 H₂O à Fe₃O₄ + 4H₂

 

Q. No. 13

a). Page No.167

 

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