EASY
Earn 100

What is covalency?

Important Questions on Chemical Bonding and Molecular Structure

EASY
Nitrogen shows maximum covalency of 4 where as other heavier elements of the group show higher covalency because.
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What is the nature of the bond between B and O in C2H52OBH3 ?
MEDIUM
Which of the following compounds contain(s) no covalent bond(s)?

KCl, PH3, O2, B2H6, H2SO4
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The covalency of elements explains about a number of _____ formed by the atom.
HARD
The formation of ammonium ion takes place through _____ (coordinate/ ionic) bond formation.
MEDIUM

Some compounds along with their chemical formulae are given below.

Compounds Chemical Formulae
Magnesium nitrate  Mg(NO3)2
Aluminium nitride AlN
Zinc phosphate Zn3(PO4)2
Calcium oxide CaO

On the basis of formulae given above, the valencies or charges on ions are given below. Select the incorrect option.

HARD
Cl-, F-, CO3-2 and SO42- are _____ radicals. (acidic / basic)
EASY
The _____ compounds generally have low melting and boiling points.
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The chemical formula of sodium chlorate is NaClO3 then the chemical formula of sodium hypochlorite is 
HARD

Limestone is _____.

(A) CaCO3                  (B) CaO                   (C) CaOH2

Enter your correct answer as A, B or C.

EASY
For the formation of a covalent bond, both atoms should have _____  ionisation energy.(high/low)
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The formula of washing soda is _____.

(A) Na2CO3.10H2O              (B) Na2CO3                (C) Na2CO3.2H2O

Enter your correct answer as A, B or C.

HARD
The correct statement(s) regarding,

(i) HClO

(ii) HClO2

(iii) HClO3 and

(iv) HClO4 is are
MEDIUM
In _____ bonding, the valence electrons are shared among all the atoms of the metallic elements.
EASY
Methane has _____ tetrahedron structure. (irregular/regular)