Property of all the alkali metals that decreases with their atomic number is `//` are I) Solun=bility of their hydroxides II) Thermal stability of their carbonates III) Softness IV) Hydration energyA. III,IVB. II,IVC. I onlyD. IV only

Property of all the alkali metals that decreases with their atomic num

1.	Property of all the alkali metals that decreases with their atomic number is `//` are I) Solun=bility of their hydroxides II) Thermal stability of their carbonates III) Softness IV) Hydration energyA. III,IVB. II,IVC. I onlyD. IV only
Answer» Correct Answer - D

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A Typical characteristic of the representative element is that the first member of each group gives different present in that group. Lithium is no excepton. Through it is the first member of the alkali metal family (group f), it is anomalous in behaviour. This may be attributed to the small size of both Li and `Li^(+)` ion, high ionisation enthalpy, high polarising power, and non- availability of d-electrons in its valence shell. Which of the following ions has the lowest mobility in aqueous solution ?A. `Li^(+)`B. `Na^(+)`C. `K^(+)`D. `Cs^(+)`
Assertion (A): `K_(2)CO_(3)` cannot be prepared by Solvaly process. Reason (R ): `KHCO_(3)` being fairly soluble does not precipitate out in carbonation tower.A. If both assertion and reason and correct and reason explanation for assertion.B. If both assertion and reason are correct but reason is not correct explanation for assertionC. If assertion is correct but reason is incorrectD. If both assertion and reason are incorrect
`{:(,"COLUMN-I","COLUMN-II"),((A),KHCO_(3) ,(P)"Exists in solid state"),((B),NaHCO_(3),(Q)"Soluble in water"),((C),LiHCO_(3),(R)"Hydrogen bonding"),((D),NH_(4)HCO_(3),(S)"Dimeric anion"):}`A. A-Q,B-PR,C-P,D-SB. A-PQRS,B-PQR,C-Q,D-PC. A-PQ,B-S,C-P,D-RSD. A-P,B-PS,C-R,D-Q
Number of `HCO_(3)` ions joined by Hydrogen bonding in `KHCO_(3)` is :
Assertion: `KHCO_(3)` can not be obtained by solvay process. Reason: `KHCO_(3)` is less soluble than `NaHCO_(3)`A. If both Assertion & Reason are True & the Reason is a correct explanation of the AssertionB. If both Assertion & Reason are True but Reason is not a correct explanation of the AssertionC. If Assertion is True but the Reason is FalseD. If both Assertion & Reason are False
How many of the following bicarbonates are solid in nature? `LiHCO_(3),NaHCO_(3),KHCO_(3),RbHCO_(3),CaHCO_(3),CsHCO_(3), Be(HCO_(3))_(2), Mg(HCO_(3))_(2),Ca(HCO_(3))_(2)Sr(HCO_(3))_(2),Ba(HCO_(3))_(2)`
Identify W, X, Y and Z respectively in the given reactions. `CaCO_(3)overset(Delta)toW+X` `W+H_(2)O to Y` `Y+Z to NaOH+CaCO_(3)`A. `CaO, CO_(2), CaCO_(3), Na_(2)CO_(3)`B. `Co_(2), Ca(OH)_(2), Ca(HCO)_(3), NaHCO_(3)`C. `CaO, CO_(2), Ca(OH)_(2), Na_(2) CO_(3)`D. `CO_(2), CaO, H_(2)CO_(3), Na_(2)CO_(3)`
Which of the following is a good dehydrating agent.A. Conc. HClB. Anhydrous `CaCl_(2)`C. `NanO_(2)`D. `K_(2)CO_(3)`
Assertion: Halides of Be dissolve in organic solvents Reason: Atomic size of Be is smaller in the s-block elements.A. If both Assertion & Reason are True & the Reason is a correct explanation of the AssertionB. If both Assertion & Reason are True but Reason is not a correct explanation of the AssertionC. If Assertion is True but the Reason is FalseD. If both Assertion & Reason are False
Assertion : Alkali metals have least value of ionization energy within a period. Reason : They precede alkaline earth metals in periodic table.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertionC. If assertion is true but reason is false.D. If assertion is false but reason is true.

Property of all the alkali metals that decreases with their atomic number is `//` are I) Solun=bility of their hydroxides II) Thermal stability of their carbonates III) Softness IV) Hydration energyA. III,IVB. II,IVC. I onlyD. IV only

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