1. (B) (ii) only Double displacement reaction is the reaction in which two different atoms or group of atoms are mutually exchanged. In this reaction, sodium and barium were mutually exchanged.

    (B) (ii) only
    Double displacement reaction is the reaction in which two different atoms or group of atoms are mutually exchanged. In this reaction, sodium and barium were mutually exchanged.

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  2. [C] (I) and (III) Copper is placed above silver in electrochemical series and thus reaction occurs Cu+2Ag⁺ → Cu2⁺ +2Ag

    [C] (I) and (III)
    Copper is placed above silver in electrochemical series and thus reaction occurs
    Cu+2Ag⁺ → Cu2⁺ +2Ag

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  3. [B] The different colours in the white light bend towards the normal line at different angles on entering prism.

    [B] The different colours in the white light bend towards the normal line at different angles on entering prism.

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