A metal oxide is acidic when: (a) \( \sqrt{\varphi}2.1 \) (b) \( \sqrt{\dot{\varphi}}=2.1 \) to ...

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A metal oxide is acidic when:
(a) \( \sqrt{\varphi}2.1 \)
(b) \( \sqrt{\dot{\varphi}}=2.1 \) to \( 3.2 \)
(c) \( \sqrt{\varphi}3.2 \)
(d) None of these
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