The property of alkali metals that increases with increasing atomic number is -

1. First ionization energy                         

2. Electronegativity

3. Hydration energy of the univalent ion   

4. Atomic radius

Subtopic:  Physical Properties |
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A metal [X] heating on nitrogen gas gives [Y]. [Y] on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a blue colour. [Y] is-

1. MgNO32                                     

2. Mg3N2

3. NaN3                                             

4. MgO

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

1. The milk of magnesia used as an antacid is chemically MgO + MgCl2

2. Stability of alkali metal peroxides increases with an increase in atomic number.

3. Hydration energy of AgF is higher than its lattice energy.

4. Anhydrous MgCl2 cannot be prepared by direct heating of MgCl2 . 6H2O

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
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CaCl2 is preferred over NaCl for clearing ice on roads particularly in very cold countries. This is because:

1. CaCl2 is less soluble in H2O than NaCl.

2. CaCl2 is hygroscopic but NaCl is not.

3. Eutectic mixture of CaCl2/H2O freezes at -55°C while that of NaCl/H2O freezes at -18°C.

4. NaCl makes the road slippery but CaCl2 does not.

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
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A compound (A) is used in the preparation of washing soda to recover ammonia in Solvay's process. When CO2 is bubbled through an aqueous solution of (A), the solution turns milky. It is used in whitewashing due to its disinfectant nature. The chemical formula of A is : 

1. CaHCO32                       

2. CaO

3. CaOH2                           

4. CaCO3

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
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The effect of addion of gypsum to cement is-

1. It reduces the setting time of cement .    

2. The setting time of cement increases.

3. The colour of cement becomes light .          

4. A shining surface is obtained.

Subtopic:  Reasoning Questions | Compounds of Ca and Na -Preparations, Properties & Uses |
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The strongest factor responsible for reducing action of Li metal in an aqueous solution is :

1. Sublimation enthalpy .         

2. Ionisation enthalpy.

3. Hydration enthalpy .             

4. Electron-gain enthalpy.

Subtopic:  Physical Properties |
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In the reaction M+O2MO2 (superoxide) the metal is -

1. Li                 

2. Na

3. K                 

4. Ba 

Subtopic:  Chemical Properties |
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Sodium reacts with water less vigorously than potassium because-

1. It has a higher atomic weight.

2. It is less electropositive .

3. It is more electronegative. 

4. It is a metal .

Subtopic:  Chemical Properties |
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The correct relation about the density of Na and K is 

1. Na > K                                                     

2. Na = K

3. K > Na                                                     

4. Li > K

Subtopic:  Physical Properties |
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