Alkali metal with the lowest melting point is -

1. Na

2. K

3. Rb

4. Cs

Subtopic:  Physical Properties |
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The incorrect statement about alkali metals is -

1. They have low density.

2. They have high ionization enthalpy.

3. They are highly reactive.

4. They show photoelectric effect.

Subtopic:  Physical Properties |
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The oxidation state of sodium in Na2O2 is -

1. +1

2. -1

3. 0

4. +2

Subtopic:  Physical Properties | Chemical Properties |
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Beryllium and Magnesium do not impart color in flame test, because -

1. Be and Mg have high Ionization Energy.

2. Be and Mg have low Ionization Energy.

3. Be and Mg radiate energy in the Infra-Red region.

4. Be and Mg have a high radius.

Subtopic:  Physical Properties |
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Lithium salts are generally hydrated because they have :

1. High polarizing power.

2. High ionization enthalpy.

3. High electronegativity.

4. Low polarizing power.

Subtopic:  Physical Properties | Chemical Properties |
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The incorrect statement among the following regarding alkaline earth metals is : 

1. Alkaline earth metals are silvery-white, lustrous, and harder than alkali metals.
2. Only Ca, Sr, Mg, and Ba give a flame test.
3. Alkaline earth metals have high electrical, and thermal conductivities.
4. All alkaline earth metals react with halogen and form metal halides, with the general formula  MX2 .

Subtopic:  Physical Properties |
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The incorrect statement among the following is-

1. Ionisation enthalpy of alkaline earth metals is higher than alkali metals.
2. Alkaline earth metal oxides are more basic than alkali metal oxides.
3. Alkaline earth metal hydroxides are less basic and less stable than alkali metal hydroxides.
4. Solubility of Alkaline earth metals and alkali metal hydroxide increases down the group.

Subtopic:  Physical Properties |
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