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  • A s-block element (M) reacts with oxygen to form an oxide of the formula . The oxide is pale yellow in colour and paramagnetic. The element (M) is:O

A s-block element (M) reacts with oxygen to form an oxide of the formula \mathrm{MO_2}. The oxide is pale yellow in colour and paramagnetic. The element (M) is:
Option: 1 Mg
Option: 2 Na
Option: 3 Ca
Option: 4 K

Answers (1)

best_answer

As we have learnt,

Larger metals in Group 1 (Alkali metals) form their superoxide upon reaction with air.

Superoxides are paramagnetic and are orange - yellow in colour.

\text{K, Rb and Cs} show this behaviour.

Elements of Group 2 form their oxides upon reaction with excess oxygen which are generally colourless

Hence, the correct answer is option (4)

Posted by

sudhir.kumar

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