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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3sb147

Select the correct statement(s) about lithium and its compounds.

A $LiOH$ is the least soluble hydroxide among the alkali metal hydroxides.
BBurning lithium in excess dry oxygen gives mainly $Li X_{2} O$ rather than a peroxide.
C $LiOH$ is the strongest base among the alkali metal hydroxides.
D $LiOH$ decomposes to $Li X_{2} O$ on strong heating.

Answer: A, B, D

The small

Li X^{+}

gives a high lattice energy oxide, so

2 LiOH Li X_{2} O + H X_{2} O

occurs and the normal oxide is the main combustion product. Its hydroxide has the lowest solubility of the group and is the weakest base, because basicity rises down the group. Three statements are correct.

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