Which of the following groups follows Dobereiner’s law of triads?

Sr, Ba, Ca

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Br, Cl, I

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Cl, Br, I

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Li, K, Na

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Solution

The correct option is B
Cl, Br, I
Of the given options, only the triad - Cl, Br, I, follows Dobereiner’s law. The elements are in the increasing order of their atomic mass and the middle element has atomic mass which is average of other two elements.

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Similar questions

Consider the following elements :

Ca, Cl, Na, I, Li, Ba, Sr, K, Br

Separate these elements into three groups (families) of similar properties. State one property in each case on the basis of which you have made your choice.

Q. State whether the following elements belong to a Group (G), Period (P) or Neither Group nor Period (N).

Elements	G/P/N
$L i, C, O$
$M g, C a, B a$
$B r, C l, F$
$C, S, B r$
$A l, S i, C l$
$L i, N a, K$
$C, N, O$
$K, C a, B r$

Identify the missing elements from the following Dobereiner's triads.

Q. Which of the following is not a Döbereiner’s triads?

[Given: Atomic mass of elements : L i = 6.9, N = 14, N a = 23, P = 31, C l = 35, K = 39 C a = 40, A s = 74.9, B r = 79.9, S r = 87.6, I = 126.9, B a = 137.3]

Q. Consider the following orderings:

I

A l > S i > P > C l

I I

B e < M g < C a < S r

I I I

I < B r < C l < F

I V

{N a}^{+} < {M g}^{2 +} < {A l}^{3 +} < {S i}^{4 +}

Which of these give(s) a correct trend in ionization energy?

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Which of the following groups follows Dobereiner’s law of triads?

The correct option is BCl, Br, IOf the given options, only the triad - Cl, Br, I, follows Dobereiner’s law. The elements are in the increasing order of their atomic mass and the middle element has atomic mass which is average of other two elements.

The correct option is B
Cl, Br, I
Of the given options, only the triad - Cl, Br, I, follows Dobereiner’s law. The elements are in the increasing order of their atomic mass and the middle element has atomic mass which is average of other two elements.