Metals, Non-Metals and Noble Gases

Q: Which of the following reaction when heated quickly produces small amount of chloride gas?

(a) :  NaCl+HNO3
(b) :  NaCl+MnO2
(c) :  NaCl+H2SO4
(d) :  HCl+KMnO4
(e) :  None of the Above
Answer:  HCl+KMnO4
Explanation:  2KMnO4+16HCl 2KCl+2MnCl2+8H2O+5Cl2 KMnO4 is strongest oxidizing agent, which oxidize chlorine ion to chlorine gas.

Q: Which of the following gases is the component of a volcanic gases?

(a) :  CO2
(b) :  SO2
(c) :  NO
(d) :  NO2
(e) :  None of the Above
Answer:  SO2
Explanation:  Sulphur dioxide (SO2) is component of a volcanic gases.

Q: Aluminium reacts easily with most of mineral acids but is passive towards:

(a) :  HCl
(b) :  H2SO4
(c) :  HNO3
(d) :  H3PO4
(e) :  None of the Above
Answer:  HNO3
Explanation:  

Q: Catalyst used for the preparation of SO3 in contact process is:

(a) :  pt/asbestos
(b) :  V2O5
(c) :  a & b
(d) :  Ni
(e) :  None of the Above
Answer:  a & b
Explanation:  

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