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CBSE

Chemistry

NEET Chemistry : Classification of Elements and Periodicity in Properties

The species Ar, K⁺ and Ca²⁺ contain the same number of electrons. In which order do their radii increase?

which of the following orders of ionic radii is correctly represented?

The number of d- electrons in Fe²⁺ (Z = 26) is not equal to the number of electrons in which one of the following?

In which of the following options the order of arrangement does not agree with the variation of the property indicated against it?

Be²⁺ is isoelectronic with which of the following ions?

Which of the following pairs of ions are isoelectronic and isostructural?

$CO subscript 3 superscript 2 minus end superscript comma space SO subscript 3 superscript 2 minus end superscript$
$ClO subscript 3 superscript minus comma space CO subscript 3 superscript 2 minus end superscript$
$SO subscript 3 superscript 2 minus end superscript comma NO subscript 3 superscript minus$
$SO subscript 3 superscript 2 minus end superscript comma NO subscript 3 superscript minus$

Solubility of the alkaline earth's metal sulphates in water decreases in the sequence

The electronic configuration of Eu (Atomic no.63), Gd (Atomic no. 64) and Tb (Atomic no. 65) are

Identify the wrong statement in the following.

Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius
Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius
Atomic radius of the elements increases as one moves down the first group of the periodic table
Atomic radius of the elements increases as one moves down the first group of the periodic table

10.

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl?

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