Question with Answer Chemistry

1. A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid?
A:  Three
B:  Four
C:  One
D:  Two  
Correct Answer: A
2.  The standard emf of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25°C. The equlibrium constant of the reaction would be :  (Given : F = 96500 C mol–1; R = 8.314 JK–1 mol–1) 
A:  2.0 × 1011
B:  4.0 × 1012
C:  1.0 × 102 
D:  1.0 × 1010 
Correct Answer: D
3. The hormone that helps in the conversion of glucose to glycogen is :
 A:  cortisone
 B:  bile acids
C:  adrenaline 
D:  insulin 
Correct Answer: D 
4. The enzyme which hydrolyses triglycerides to fatty acids and glycerol is called :
 A:  maltase
B:  lipase
C:  zymase
D:  pepsin   
Correct Answer: B
5.  A compound formed by elements X and Y crystallizes in a cubic structure in which the X atoms are at the corners of a cube and the Y atoms are at the face-centres. The formula of the compound is :
A:  XY3 
B:  X3Y 
C:  XY 
D:  XY2     
 Correct Answer: A
6.  Standard enthalpy and standard entropy changes for the oxidation of ammonia at 298K are – 382.64 kJ mol–1 and –145.6 JK–1 mol–1, respectively. Standard Gibbs energy change for the same reaction at 298 K is :
A:  –2221.1 kJ mol–1  
 B:  –339.3 kJ mol–1
C:  – 439.3 kJ mol–1  
D:  – 523.2 kJ mol–1    
Correct Answer: B
7.  Which of the following co-ordination compounds would exhibit optical isomerism ?
A:  Pentaamminenitrocobalt (III) iodide
 B:  Diamminedinitroplatinum (II)
C:  trans-dicyanobis (ethylenediamine)
D:  Tris-(ethylendiamine) cobalt (III) bromide
 Correct Answer: D 
8. The maximum number of molecules is present in : 
A:  15 L of H2 gas at STP
B:  5 L of N2 gas at STP
C:  0.5 g of H2 gas
D:  10 g of O2 gas   
Correct Answer: A
9.  Which of the following forms cationic micelles above certain concentration?
A:  Sodium ethyl sulphate
B:  Sodium acetate
C:  Urea
D:  Cetyltrimethylammonium bromide  
Correct Answer: B 
10. Which one of the following is a chain growth polymer?
A:  Starch
B:  Nucleic acid
C:  Polystyrene
D:  Protein  
Correct Answer: C 
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