The correct statement(s) about the structure of BeCl2 is -
a. BeCl(solid)- exists as polymer.
b. BeCl(vapour)- exists as chlorobridged dimer.
c. BeCl2 has bent structure in the vapour phase.
1. a
2. a & b
3. b
4. b & c

Subtopic:  Chemical Properties |
 73%
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Be and Mg did not give flame colour because: 

1. Energy released by excited electron falls in visible region.

2. Energy released by excited electron does not fall in visible region

3. s-s transition.

4. Charge transfer.

Subtopic:  Physical Properties | Reasoning Questions |
 79%
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An alkali metals that forms only the normal oxide M2O on heating in air is-

1. Rb

2. K

3. Li

4. Na

Subtopic:  Chemical Properties |
 88%
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 Alkali metal with the lowest melting point is -

1. Na

2. K

3. Rb

4. Cs

Subtopic:  Physical Properties |
 67%
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The chemical formula of Plaster of Paris is:

1. CaSO4.12H2O

2. CaSO4.2H2O

3. CaSO4.H2O

4. 3CaSO4.H2O

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 89%
From NCERT
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The correct order of  thermal stability of carbonates of Group 2 elements is-

1. BeCO3<MgCO3<CaCO3<SrCO3<BaCO3

2. BeCO3<MgCO3<BaCO3<SrCO3<CaCO3

3. BaCO3<MgCO3<CaCO3<SrCO3<BeCO3

4. BaCO3<CaCO3<MgCO3<SrCO3<BeCO3

Subtopic:  Chemical Properties |
 86%
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Alkali and alkaline earth metals cannot be obtained by chemical reduction method because they are the strongest :

1. Oxidizing agents.

2. Reducing agents.

3. Hydrating agents.

4. Drying agents.

Subtopic:  Reasoning Questions |
 90%
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Potassium carbonate cannot be prepared by the Solvay process because -

1. Potassium carbonate is insoluble in water and does not precipitate out.
2. Potassium carbonate is soluble in water and does not precipitate out.
3. Potassium carbonate is soluble in water and does precipitate out.
4. Potassium carbonate is insoluble in water and does precipitate out.

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 75%
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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 |
 74%
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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 |
 70%
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