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 C
Cl, Br, I

Dobereiner's law of Triads:

(i) The elements are written in increasing order of atomic mass

(ii)The mass of middle element was roughly the average of atomic masses of other two elements

(iii) Elements in the triads show similar properties.

Of the given options, you can deduce that only in option 3, elements are in the increasing order of their atomic mass and the middle element is roughly the average of atomic masses of other two elements. Hence Cl, Br and I form Doberenier's triads.

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Similar questions

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

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

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.

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]

For the following

(a) $I^{-}$ (b) $C l^{-}$ (c) $B r^{-}$
The increasing order of nucleophilicity would be

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