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 |
 77%
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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 |
 72%
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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 |
 74%
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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 |
 71%
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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 |
 72%
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