When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. 

The substance A, B, C and D, respectively are:
1.  K, H2, NaOH, Zn
2.  Na, NaOH, H2 , Zn
3.  Li, H2, LiOH, Zn
4.  None of the above

Subtopic:  Chemical Properties |
 71%
From NCERT
AIPMT - 1998
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A solid compound 'X' on heating gives CO2 gas and a residue. The residue mixed with water forms 'Y'. On passing an excess of CO2 through 'Y' in water, a clear solution, 'Z' is obtained. On boiling 'Z', compound 'X' is reformed. The compound 'X' is:

1. CaCO3

2. Na2CO3

3. K2CO3

4. Ca(HCO3)2

Subtopic:  Chemical Properties |
 84%
From NCERT
AIPMT - 2004
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The most convenient method to protect the bottom of the ship made of iron is:

1. Coating it with Red lead oxide.
2. White tin plating.
3. Connect it with the Mg block.
4. Connect it with the Pb block.

Subtopic:  Preparations, Properties & Uses of S Block Elements |
AIPMT - 2001
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Alkali metals are not found in nature in their elemental state because they are : 

1. Less reactive due to low ionization energies.

2. Highly reactive due to low ionization energies.

3. Highly reactive due to low electron gain enthalpy.

4. Less reactive due to low electron gain enthalpy.

Subtopic:  Chemical Properties |
 86%
From NCERT
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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 |
 72%
From NCERT
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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 |
 89%
From NCERT
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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 |
 73%
From NCERT
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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%
From NCERT
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The hydroxides and carbonates of sodium and potassium are easily soluble in water while the corresponding salts of magnesium and calcium are sparingly soluble in water because -

1. Lattice energies of carbonates and hydroxides formed by calcium and magnesium are much more than those of sodium and potassium.

2. Lattice energies of carbonates and hydroxides formed by sodium and potassium are much more than those of calcium and magnesium.

3. Enthalpy of carbonates and hydroxides formed by calcium and magnesium are much more than those of sodium and potassium.

4. Enthalpy of carbonates and hydroxides formed by sodium and potassium are much more than those of calcium and magnesium.

Subtopic:  Reasoning Questions | Compounds of Ca and Na -Preparations, Properties & Uses |
 69%
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