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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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 |
 74%
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The incorrect equation for Solvay process is -

1. Ca(OH)2+2NH4ClNH3+2H2O+CaCl2

2. 2NaHCO3Na2CO3+CO2+H2O

3. 2NaCl+CaCO3Na2CO3+CaCl2

4. None of the above.

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
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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 |
 75%
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LiF is almost insoluble in water whereas LiCl is soluble in water and acetone both, because of:

1. Greater covalent character of LiCl as compared to LiF.
2. Greater hydration energy of  LiF as compared to LiCl.
3. Greater size of LiF as compared to LiCl.
4. Greater lattice energy of LiF as compared to LiCl.

 

Subtopic:  Chemical Properties | Reasoning Questions |
 57%
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The incorrect reaction among the following is:

1. Na2O2(s) + 2H2O(l) → 2NaOH(aq) + H2O2(g)
2. 2KO2(s) + 2H2O(l) → 2KOH(aq) + H2O2(aq) + O2(g)
3. Na2O(s) + CO2(g) → NaHCO3 (s) + H2O2(aq)
4. Na2O(s) + CO2(g) → Na2CO3 (s)

Subtopic:  Chemical Properties | Compounds of Ca and Na -Preparations, Properties & Uses |
 69%
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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 |
 75%
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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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The incorrect statement among the following is -

1. The thermal stability of nitrates of groups 1 and 2 increases down the group.
2. Nitrates of both groups 1 and 2 are insoluble in water.
3. The solubility of alkali metal carbonates increases down the group.
4. The solubility of alkaline earth metals sulphates decreases down the group.

Subtopic:  Chemical Properties |
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