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Question 1
A
2,8,8,2  
B
2,2,8,8  
C
2,8, 2, 8,  
D
8,8,2,2 
Explanation.
K-shells contain maximum of 2-electron, L shells can only contain maximum of 8 electrons, M-shells contain
maximum of 18 electrons, N- contains 32 electrons. Calcium with atomic number 20, shows that electrons are added
to a shell until a stable duplet (for the K-shell) and an octet for L-shells. The increase in the number of electron result
in the electrons occupying the shell with next highest energy level so calcium has 2, 8, 8, 2 (A).

Correct Option:
A

Question 2
A
Isoprene  
B
pentane  
C
butadiene  
D
butene 
Explanation.
Synthetic rubber is a polymer and the simple unit (monomer) is 2-methylbuta- 1, 3-diene known as isoprene unit (A).

Correct Option:
A

Question 3
A
+7&+6  
B
+2&+2  
C
+4&+4 
Explanation.
MnO2- = -2
X+(-2x2) =-2
X + -4 = -2
X = +2
MnO4 = -1
X+(-2x4)=-1
X = -1+8
X=+7 (B)

Correct Option:
B

Question 4
A
CH  
B
CH2  
C
C2H  
D
C2H2 
Explanation.
  C H
% composition Mole ratio 92.3% 7.7%
  92.3/12 7.7/1
Mole ratio of element 7.67 7.7
Smallest mole ratio 7.67 7.67
= 1 1


Empirical formula  =  CH (A)


Correct Option:
A

Question 5
A
SP3  
B
SP2  
C
SP  
D
PS2 
Explanation.
Saturated hydrocarbons have single bond around its carbon, so they exhibit SP3 hybridization (A)

Correct Option:
A

Question 6
A
Electron deficient species  
B
Electron rich species  
C
Free radical species  
D
Negatively charged species 
Explanation.
Electrophiles are electron deficient species like NH4+,H+ (A)

Correct Option:
A

Question 7
A
X(SO4)3  
B
XSO4  
C
X2(SO4)  
D
X3SO4 
Explanation.
The metal must be divalent, i.e. having 2- electrons in its outermost shell to donate to the sulphate, SO42- to give XSO4 (B)

Correct Option:
B

Question 8
A
Oxygen  
B
neon  
C
nitrogen  
D
argon 
Explanation.
Alkaline pyragallol is used to absorb oxygen (A)

Correct Option:
A

Question 9
A
Oxyethane flame  
B
Oxyethyleno flame  
C
Hydroxide flame  
D
Oxyacetylene flame 
Explanation.
CaC2 + 2H2O → C2H2 + Ca(OH)2
Ethyne (ethylene) produced when passed through oxygen give oxyacetylene flame, used for welding (D)

Correct Option:
D

Question 10
A
61 
B
59 
C
30 
D
27 
Explanation.
M(OH)3 = 78gmol-1
M+(16+1)3 = 78
M+(17x3) = 78
M=78—51 = 27(D)

Correct Option:
D

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