Among the following, the incorrect statement is–

1. Lithium is the softest among all the alkali metals

2. Lithium possesses higher melting and boiling points

3. It is least reactive among alkali metals

4. It forms chloride which is soluble in alcohol

Subtopic:  Physical Properties |
 56%
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The correct order of increasing lattice energy of the metallic compounds is –

(1) NaCl < CaO < NaI < BaO               

 

(2) NaI < NaCl < BaO < CaO

(3) NaCl < NaI < BaO < CaO                 

(4) NaI < NaCl < CaO < BaO

Subtopic:  Physical Properties |
 57%
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Which alkali metal has the lowest melting point and exists as a liquid  at 30 degree temp–

(1) Na                                                             

(2) K 

(3) Rb                                                             

(4) Cs

Subtopic:  Physical Properties |
 73%
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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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