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Standard XII

Chemistry

Trend in Ionisation Enthalpy

Predict the f...

Question

Predict the formula of a compound formed between a metal 'M' which has 1st, 2nd, 3rd IP values as 518, 7314, 9820 $K J m o l^{- 1}$ respectively and a halogen 'X'.

M X_{2}

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M_{2} X_{3}

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M X_{3}

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Solution

The correct option is D MX
Alkali metals have low first ionization energies and relatively higher second and third ionization energies because the electron have to be remover from a stable octet.

As in the given question, there is more difference in the values of first and second ionization energies i.e. the metal has 1 valence electron,

$∴$ formula of the compound will be $M X$ .

Option D is correct.

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Similar questions

Q. The metal which can form a predominantly stable covalent halide of the formula MX (X

=

halogen)?

Δ H_{f}^{\circ}

of a hypothetical salt,

M X

150 {kJmol}^{- 1}

and for

M X_{2}

it is

- 600 {kJmol}^{- 1}

. The enthalpy of disproportionation of

M X

- 100 {x kJmol}^{- 1}

. The value of

x

The first (Δ_iH1) and the second (Δ_iH) ionization enthalpies (in kJ mol^–1) and the (Δ_egH) electron gain enthalpy (in kJ mol^–1) of a few elements are given below:

Elements	Δ_iH	Δ_iH	Δ_egH
I	520	7300	–60
II	419	3051	–48
III	1681	3374	–328
IV	1008	1846	–295
V	2372	5251	+48
VI	738	1451	–40

Which of the above elements is likely to be :

(a) the least reactive element.

(b) the most reactive metal.

(d) the least reactive non-metal.

(e) the metal which can form a stable binary halide of the formula MX₂, (X=halogen).

(f) the metal which can form a predominantly stable covalent halide of the formula MX (X=halogen)?

Q. Metal X form 2 oxide. Formula of

1^{s t}

{X O}_{2}

1^{s t}

oxide contain

50 % O_{2}

. If

2^{n d}

oxide contain

60 % O_{2}

.Formula of

2^{n d}

oxide?

Q. Metal M crystallizes in a simple cubic crystal and has a packing efficiency of 52.2%. When it combines with a halogen

X_{2}

and forms MX, it forms a NaCl type crystal with a cation to anion size ratio of 1:2. Packing efficiency (%) of the MX crystal is

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Predict the formula of a compound formed between a metal 'M' which has 1st, 2nd, 3rd IP values as 518, 7314, 9820 KJmol−1 respectively and a halogen 'X'.

Predict the formula of a compound formed between a metal 'M' which has 1st, 2nd, 3rd IP values as 518, 7314, 9820 $K J m o l^{- 1}$ respectively and a halogen 'X'.