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

Subtopic:  Physical Properties |
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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 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 |
 64%
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Blue colour of the solution of alkali metal in ammonia is due to the presence of-

1. M-atoms                                         

2. M+ ions 

3. Solvated anions                             

4. Solvated electrons

Subtopic:  Chemical Properties |
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The compound X on heating gives a colourless gas. The residue is dissolved in water to obtain Y. Excess of CO2 is bubbled through aqueous solution of Y, 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 |
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Assertion : s-block elements do not occur free in nature

Reason :  s-block elements are highly electropositive in nature.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Physical Properties |
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The cation of alkali metals are found as M(H2O)+n in H2O, value of 'n' is maximum for

1. Na+

2. K+

3. Rb+

4. Li+

Subtopic:  Reasoning Questions |
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1 mole of substance (X) was treated with an excess of water. 2 moles of readily combustible gas were produced along with solution which when reacted with CO2 gas produced a white turbidity. The substance (X) could be

(1) Ca

(2) CaH2

(3) Ca(OH)2

(4) Ca(NO3)2

Subtopic:  Chemical Properties |
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A chloride dissolves appreciably in cold water. When placed on a Pt-wire in Bunsen flame, no distinctive colour is noticed. Cation present is

(1) Mg2+

(2) Ba2+

(3) Pb2+

(4) Ca2+

Subtopic:  Physical Properties |
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