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Standard XII

Chemistry

Melting and Boiling point

In group 15, ...

Question

In group 15, the melting points of the elements :

Increase regularly on moving down the group

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Decrease regularly on moving down the group

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First decrease upto As and then increase to Bi

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First increase from N to As and then decrease to Bi

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Solution

The correct option is D First increase from N to As and then decrease to Bi
Element Melting point
N 63 K
P 317 K
As 1089 K
Sb 904 K
Bi 544 K

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Similar questions

Among 3d transition series the ionization enthalpy:

Q. In group 13, electronegativity first decreases from B to Al and then increase marginally down the group. This is because of :

Q. The electronegativity values of

C, N, O

and

F

on Pauling scale:

Parts (a) to (e) refer to changes in the properties of elements on moving from left to right across a period of Periodic Table. For each property, choose the correct answer.

(a) The non-metallic character of the elements :

(i) decreases, (ii) increases,

(iii) remains the same, (iv) depends on the period

(b) The electronegativity :

(i) depends on the number of valence electrons,

(ii) remains the same,

(iii) decreases,

(iv) increases.

(i) goes up and down (ii) decreases

(iii) increases (iv) remains the same

(d) The atomic size :

(i) decreases,

(ii) increases,

(iii) remains the same ,

(iv) sometimes increases and sometimes decreases.

(e) The electron affinity of the elements in groups 1 to 7 :

(i) goes up and then down.

(ii) decreases and then increases,

(iii) increases,

(iv) decreases.

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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In group 15, the melting points of the elements :

The correct option is D First increase from N to As and then decrease to BiElementMelting pointN63 KP317 KAs1089 KSb904 KBi544 K

The correct option is D First increase from N to As and then decrease to Bi
Element Melting point
N 63 K
P 317 K
As 1089 K
Sb 904 K
Bi 544 K