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Acidic Character, Basic Character and Nature of Oxides

Acidity of pe...

Question

Acidity of pentoxides in VA group

A

Decreases

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B

Increases

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C

Remains same

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D

None

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Solution

The correct option is A
Decreases

Basic or metallic character of pentaoxides in VA group increases down the group. Hence acidity decreases.

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Acidity of pentoxides in VA group

Q. The following are some statements about periodic properties.
i) Atomic size decreases from left to right in a period.
ii) The EA of

2^{n d}

group elements in VA, VIA and VIIA are greater than the first element.
iii) Acidic nature of oxides decreases and basic nature of oxides of elements increased down the group.
iv) Atomic size increases from left to right in a period.

Q. Assertion :Acidic character of group 16 hydrides increases from

H_{2} O

H_{2} T e

. Reason: Thermal stability of hydrides decreases down the group.

Give scientific reasons:

1. Atomic size increases down the group.

2. Metallic character decreases from left to right in a period.

3. Elements in the same group show same valency.

Q. Assertion :Electronegativity across a period increases and down the group decreases. Reason: As we move down the group, basic character increases while as we move across a period its acidic character increases

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Acidic Character, Basic Character and Nature of Oxides

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