1. [D] (I) and (II) Remember that - sodium and calcium are very reactive. Since, sodium (Na) and calcium (Ca) are always present in the top section in the series of the reactivity. Therefore, they obtained by

    [D] (I) and (II)
    Remember that – sodium and calcium are very reactive. Since, sodium (Na) and calcium (Ca) are always present in the top section in the series of the reactivity. Therefore, they obtained by

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