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Classification of Elements and Periodicity in Properties

Multiple Choice Questions

121.
The correct order of radii is

N <Be <B

F^-<O^2-<N^3-

Na< Li< K

Fe³⁺< Fe²⁺< Fe⁴⁺

F^-<O^2-<N^3-

These are isoelectronic species and their radii decreases with increasing their atomic number due to increasing effective nuclear charge (Z_eff).

$Z_{eff} = Z - σ$

where, Z_eff = effective nuclear charge, Z= atomic number and $σ$ = screening constant. For F^-, O^2- and N^3-, the value of $σ$ is the constant due to equal number of electron. So order of Z_eff is F > O^2-> N^3-, hence, order of radii is

$F^{-} < O^{2 -} < N^{3 -} (radii \infty \frac{1}{Z_{eff}})$

122.

Which of the following element shows maximum valency ?

Carbon
Barium
Nitrogen
Sulphur

123.

The metal used to recover copper from a solution of CuSO₄ is :

124.

Which of the following elements never show positive oxidation number?

125.

Which of the following element is a metalloid?

126.

What is the name of element with atomic number 105?

Kurchatovium
Dubnium
Nobelium
Holmium

127.

Which among the following elements have lowest value of IE₁?

128.

KI and CusO₄ solution when mixed, give :

CuI₂ + K₂SO₄
Cu₂I₂ + K₂SO₄
K₂SO₄ + Cu₂I₂ + I₂
K₂SO₄ + CuI₂ + I₂

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Multiple Choice Questions

121. The correct order of radii is N <Be <B F-<O2-<N3- Na< Li< K Fe3+< Fe2+< Fe4+

121.
The correct order of radii is

N <Be <B

F^-<O^2-<N^3-

Na< Li< K

Fe³⁺< Fe²⁺< Fe⁴⁺