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Reactivity with Halogens and Hydrogen (Group 2)

Which is not ...

Question

Which is not correctly matched?
(1) Basic strength of oxides. $C s_{2} O < R b_{2} O < K_{2} O < N a_{2} O < L i_{2} O$
(2) Stability of peroxides. $N a_{2} O_{2} < K_{2} O_{2} < R b_{2} O_{2} < C s_{2} O_{2}$
(3) Stability of bicarbonates. $L i H C O_{3} < N a H C O_{3} < K H C O_{3} < R b H C O_{3} < C s H C O_{3}$
(4) Melting point. $N a F < N a C l < N a B r < N a l$

1 and 4

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1 and 3

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1 and 2

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2 and 3

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Solution

The correct option is A 1 and 4
Basic strength of the oxides increase in the order $L i_{2} O < N a_{2} O < K_{2} O < R b_{2} O < C s_{2} O$ . The increase in basic strength is due to the decreases in I.E. and increase in electropositive character.
The melting points of the halides decrease in the order NaF > NaCl > NaBr > NaI, as the size of the halide ion increases. The decrease in melting point is due to the increase in the covalent character with an increase in the size of anion according to Fajan's rule.

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C s_{2} O < R b_{2} O < K_{2} O < N a_{2} O < L i_{2} O

N a_{2} O_{2} < K_{2} O_{2} < R b_{2} O_{2} < C s_{2} O_{2}

L i H C O_{3} < N a H C O_{3} < K H C O_{3} < R b H C O_{3} < C s H C O_{3}

N a F < N a C l < N a B r < N a I

\to C s_{2} O < R b_{2} O < K_{2} O < N a_{2} O < L i_{2} O

\to N a_{2} O_{2} < K_{2} O_{2} < R b_{2} O_{2} < C s_{2} O_{2}

\to L i H C O_{3} < N a H C O_{3} < K H C O_{3} < R b H C O_{3} < C s H C O_{3}

\to N a F < N a C l < N a B r < N a I

C s_{2} O < R b_{2} O < K_{2} O < N a_{2} O < L i_{2} O

N a_{2} C O_{3} < K_{2} C O_{3} < R b_{2} C O_{3} < C s_{2} C O_{3}

L i H C O_{3} < N a H C O_{3} < K H C O_{3} < R b H C O_{3} < C s H C O_{3}

N a F < N a C l < N a B r < N a I

C s_{2} O < R b_{2} O < K_{2} O < N a_{2} O < L i_{2} O

N a_{2} O_{2} < K_{2} O_{2} < R b_{2} O_{2} < C s_{2} O_{2}

L i H C O_{3} < N a H C O_{3} < K H C O_{3} < R b H C O_{3} < C s H C O_{3}

N a F < N a C I < N a B r < N a I

(1) Basic strength of oxides : C s_{2} O < R b_{2} O < N a_{2} O < L i_{2} O

(2) Stability of peroxides : N a_{2} O_{2} < K_{2} O_{2} < R b_{2} O_{2} < C s_{2} O_{2}

(3) Stability of bicarbonates : L i H C O_{3} < N a H C O_{3} < K H C O_{3} < R b H C O_{3} < C s H C O_{3}

(4) Melting point : N a F < N a C l < N a B r < N a I

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