Solved Chemistry MCQS
If NAis Avogadro’s number, then number of valence electrons in 4.2 g of nitride ions N3-is
3.2 NA
4.2 NA
2.4 NA
1.6 NA
Which of the following is different from the other three oxides?
ZnO
Cr2O3
SnO
MgO
Fluorine does not show positive oxidation states due to the absence of
None
s-orbitals
d-orbitals
p-orbitals
Inter molecular forces in solid hydrogen are
Van der Waal forces or London dispersion forces
Hydrogen bonds
Covalent forces
All of these.
The vapour density of a gas is 11.2. The volume occupied by 11.2 g of this gas at N.T.P. is
11.2 litres
2.24 litres
22.4 litres
1 litre
Sulphure dioxide affects
Plasmodesmata
Nucleus
Cell wall
All membrane systems
DDT is formed from
Benzene and Chlorobenzene
Chloral and benzene
Chlorobenzene and chlorine
Chloral and Chlorobenzene
Most common reactions of benzene and its derivatives are
Nucleoophilic addition reactions
Electrophilic subsitution reactions
Nucleophilic substitution reactions
Electrophilic addition reactions
The carbon atoms in calcium carbide are held by
2 covalent, one co-ordinate bond
2
Ionic bonds
Sigma bonds
What happens when isotonic solution of a (mol. wt. 342) and B (mol. wt 60) are put in to communication through semiperme-able membrane?
Change in temperature of solutions takes place.
Transference of solvent from solution A to that of B take place
Transference of solvent from solution B to that of A takes place
No transference of solvent from solution A to that of B takes place
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