Chemistry MSc

Q: Which substance does not need air as raw material for its manufacture?

(a) :  Ammonia
(b) :  Iron
(c) :  Sodium
(d) :  Sulphuric acid
(e) :  None of the Above
Answer:  Sodium
Explanation:  Na is obtained through electrolysis. A;N2+3H2 2NH3, N2 is obtained from distillation of liquid air B:Air is used to roast C:So give CO D:2SO2+O2 2SO3

Q: Burning of alkanes in the presence of oxygen is called:

(a) :  nitration
(b) :  oxidation
(c) :  catalytic oxidation
(d) :  combustion
(e) :  None of the Above
Answer:  combustion
Explanation:  Burning of an alkane in the presence of air is called combustion CH4 + 2O2 → CO2 + 2H2O + 891 Kj/mol This reaction involves formation of CO2 so it is an exothermic reaction. However this reaction requires high energy to start. For this peupose spark or flame is used. Combustion occurs in automobile engines for their smooth internel combustion

Q: Which element of group IV-A does not use d-orbital?

(a) :  N
(b) :  P
(c) :  As
(d) :  Sb
(e) :  None of the Above
Answer:  N
Explanation:  

Q: Alkylation of benzene gives:

(a) :  benzene sulphonic acid
(b) :  nitrobenzene
(c) :  maleic anhydride
(d) :  toluene
(e) :  None of the Above
Answer:  toluene
Explanation:  

Q: Which of the followinf acid can be used as a catalyst in Friedal Crafts reaction:

(a) :  AlCl3
(b) :  HNO3
(c) :  BeCl2
(d) :  NaCl
(e) :  None of the Above
Answer:  AlCl3
Explanation:  

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