Chemistry | Study Mode

Join Discuss Share Question Share to WhatsApp
Question 1
A
2,8,8,2 
B
2,2,8,8 
C
2,8, 2, 8, 
D
8,8,2,2 
Explanation.
Share Answer 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
Join Discuss Share Question Share to WhatsApp
Question 4
A
CH 
B
CH2 
C
C2
D
C2H2 
Explanation.
Share Answer
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
Join Discuss Share Question Share to WhatsApp
Question 7
A
X(SO4)3 
B
XSO4 
C
X2(SO4
D
X3SO4 
Explanation.
Share Answer 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
Join Discuss Share Question Share to WhatsApp
Question 9
A
Oxyethane flame 
B
Oxyethyleno flame 
C
Hydroxide flame 
D
Oxyacetylene flame 
Explanation.
Share Answer CaC2 + 2H2O C2H2 + Ca(OH)2
Ethyne (ethylene) produced when passed through oxygen give oxyacetylene flame, used for welding (D)

Correct Option:
D
Next Page
Question Map
Quiz link
Share Chemistry with your friends
Share to WhatsApp Share Quiz CBT mode Study mode copy link