A s-block element (M) reacts with oxygen to form an oxide of the formula MO2. The oxide is pale yellow in colour and paramagnetic. The element (M) is:

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K. Potassium (K) is an s-block element that forms the oxide K2O2, which is pale yellow and exhibits paramagnetism due to the presence of unpaired electrons in its structure. This behavior is characteristic of potassium oxides, distinguishing it from the other options.

A s-block element (M) reacts with oxygen to form an oxide of the formula MO2. The oxide is pale yellow in colour and paramagnetic. The element (M) is:

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