The boiling point of calcium is abnormally high as compared to magnesium because-

1. In calcium d-orbital forms a weak metallic bond

2. In calcium p-orbital forms  a weak metallic bond

3. In calcium d-orbital forms a strong metallic bond

4. In calcium s-orbital forms  a strong metallic bond

Subtopic:  Physical Properties |
 60%
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The decreasing order of II ionisation energy of K, Ca, and Ba is –

(1) K > Ca > Ba                                   

(2) Ca > Ba > K 

(3) Ba > K > Ca                                   

(4) K > Ba > Ca

Subtopic:  Chemical Properties |
 67%
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Two metals X and Y form covalent halides. Both halides can act as Lewis acids and a catalyst in Friedel Crafts reaction. Halide of X is polymer in the solid state and a dimer in the vapour state which decomposes to monomer at 1200 K. However, halide of Y is a dimer in vapour state and becomes ionic in polar solvent. X and Y are respectively.

(1) Be, Al                                             

(2) Al, Be

(3) Be, Ca                                             

(4) Mg, Ca

Subtopic:  Physical Properties |
 76%
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Which of the following compounds decomposes on heating similar to LiNO3.

(1) BaNO32                               

(2) SrNO32

(3) MgNO32                               

(4) All

Subtopic:  Chemical Properties |
 59%
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Solubility of sulphates in water decreases from MgSO4 to BaSO4. It is due to the fact that –

(1) Ionic nature increases

(2) Size of M2+ ion increases

(3) Lattice energy decrease

(4) Hydration enthalpy of M2+ ions decreases

Subtopic:  Physical Properties |
 72%
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In the Solvay process of manufacture of sodium carbonate, the raw materials used are :

1. Aqueous NaOH, NH3 and CO2

2. Molten NaOH, NH3 and CO

3. Brine NaCl, NH3 and CO

4. Brine NaCl, NH3 and CO2

Subtopic:  Preparations, Properties & Uses of S Block Elements |
 73%
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A blue coluored solution of an alkali metal in liq NH3 is due to the presence of -

1. M-atoms.                                         

2. M+ ions .

3. Solvated anions  .                           

4. Solvated electrons.

Subtopic:  Chemical Properties |
 80%
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Alkali metal ions are- 

1. Diamagnetic and coloured.

2. Diamagnetic and colourless.

3. Paramagnetic and coloured.

4. Paramagnetic and colourless.

Subtopic:  Physical Properties | Compounds of Ca and Na -Preparations, Properties & Uses |
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A compound X on heating gives a colourless gas. The residue is dissolved in water to obtain Y. Excess CO2 is bubbled through an aqueous solution of Y, and Z is formed. Z on gentle heating gives back X. The compound X is-

1. CaCO3                                           

2. Na2CO3

3. CaSO4.2H2O                                 

4. K2CO3

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 80%
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Magnesia can be prepared by -

1. Burning Mg in air.

2. Heating hydroxide, nitrate, sulphate or carbonate of magnesium.

3. Heating Mg in steam.

4. All of the above.

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 71%
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