The density of-

1. Na > K                                                     

2. Na = K

3. K > Na                                                     

4. Li > K

Subtopic:  Physical Properties |
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Lattice energy is lowest for –

(A) LiF                                                       

(B) NaCl

(C) KBr                                                       

(D) CsI

Subtopic:  Physical Properties |
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Which of the following halides has the highest melting point-

(A) NaCl                                           

(B) KCl

(C) NaBr                                           

(D) NaF

Subtopic:  Physical Properties | Preparations, Properties & Uses of S Block Elements |
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Alkaline earth metals form hydrated crystalline solids such as MgCl2.6H2O, CaCl2.6H2O. This is due to-

(1) Smaller ionic size

(2) Increased charge on ions

(3) Higher hydration enthalpies

(4) High oxidation potential

Subtopic:  Chemical Properties |
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A chloride dissolves appreciably in cold water. When placed in a platinum wire in Bunsen flame no distinctive colour is noticed. Which cation could be present –

(1) Be2+                                         

(2) Ba2+

(3) Pb2+                                         

(4) Ca2+

Subtopic:  Physical Properties |
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Which of the following is a false statement-

(1) Sodium oxide is more basic then magnesium oxide.

(2) Beryllium oxide is amphoteric

(3) The thermal stability of beryllium carbonate is more than that of calcium carbonate

(4) Beryllium is amphoteric

Subtopic:  Physical Properties |
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Which alkali metal has the lowest melting point and exists as a liquid –

(1) Na                                                             

(2) K 

(3) Rb                                                             

(4) Cs

Subtopic:  Physical Properties |
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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.

(A) Be, Al                                             

(B) Al, Be

(C) Be, Ca                                             

(D) Mg, Ca

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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 |
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In the Solvay process of manufacturing 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 |
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