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Preparations and Reactions of Sodium Oxide

Which of the ...

Question

Which of the following is not true about alkali metals?

A

Alkali metals do not occur free in nature.

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B

Alkali metals are good oxidising agents.

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C

Alkali metals salts impart colour to the flame.

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D

Alkali metals salts are generally ionic.

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Solution

The correct option is B Alkali metals are good oxidising agents.
Alkali metals are good reducing agents. They have low ionization enthalpy due to which their outermost valence shell electron is ready for donation. Donating electron it reduces other element and itself gets oxidized.

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Q. Assertion :Alkali metals are paramagnetic but their salts are diamagnetic. Reason: Alkali metals are elements having 1 valence electron is s-subshell. As it has one unpaired electron, the salts of alkali metals are formed by bonding of their valence electrons as they do not have unpaired electrons.

Q. Why do alkali metals form unipositive ions and impart characteristic colours to flame?

Q. The alkali metals do not occur naturally in pure form in nature due to _________.

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Q. The alkali metals dissolve in ammonia to give a deep blue solution which is conducting in nature.

M + (x + y) N H_{3} \to [M (N H_{3})_{x}]^{2 +} + 2 [e (N H_{3}) y]^{-}

Which of the following is not true about the solutions are alkali metals in liquid ammonia?

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