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Identify the correct statements about alkali metals. A. The order of standard reduction potential (M+ | M) for alkali metal ions is Na > Rb > Li. B. CsI is highly soluble in water. C. Lithium carbonate is highly stable to heat. D. Potassium dissolved in concentrated liquid ammonia is blue in colour and paramagnetic. E. All the alkali metal hydrides are ionic solids. Choose the correct answer from the options given below.

1. A, B and E only
2. A, B, D only
3. C and E only
4. A and E only

Correct answer: A and E only

Solution

Option A is correct because the standard reduction potential for alkali metals decreases down the group, making Na more positive than Rb and Li. Option E is also correct as all alkali metal hydrides are indeed ionic solids due to the strong ionic bonds formed between the alkali metal cations and hydride anions.

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