Fill Ups of The p-Block Elements , Past Year Questions JEE Advance, Class 12, Chemistry JEE Notes | EduRev

Class 12 Chemistry 35 Years JEE Mains &Advance Past yr Paper

Created by: Abhishek Kapoor

JEE : Fill Ups of The p-Block Elements , Past Year Questions JEE Advance, Class 12, Chemistry JEE Notes | EduRev

The document Fill Ups of The p-Block Elements , Past Year Questions JEE Advance, Class 12, Chemistry JEE Notes | EduRev is a part of the JEE Course Class 12 Chemistry 35 Years JEE Mains &Advance Past yr Paper.
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Q.1. The lowest possible oxidation state of nitrogen is        (1980)

Ans. –3

Solution. –3;


Q.2. Iodine reacts with hot NaOH solution. The products are NaI and .......      (1980)

Ans. NaIO3

Solution. NaIO3

Fill Ups of The p-Block Elements , Past Year Questions JEE Advance, Class 12, Chemistry JEE Notes | EduRev


Q.3. ................. is a weak acid. (HF, HCl, HI)                 (1981 - 1 Mark)

Ans. HF

Solution. HF; HF is the weakest of the three, because the ionisation (i.e. acidic character) of HX is a multistep process and when its DH, heat of ionisation, is calculated it comes out to be the minimum. This is due to the strong H – F bond, large heat of hydration (because of H-bonding) and low value of electron affinity of F-atom.


Q.4. The increase in the solubility of iodine in an aqueous solution of potassium iodide is due to the formation of ............. .              (1982 - 1 Mark)

Ans. KI3

Solution. KI3; complexes are more soluble in water as compared to normal salts. [KI+I2 → KI3]


Q.5. Hydrogen gas is liberated by the action of aluminium with concentrated solution of .............. .               (1987 - 1 Mark)

Ans. sodium hydroxide

Solution. sodium hydroxide;

Al + 2NaOH + 2H2O → 2NaAlO2 +3H2


Q.6. .............. phosphorus is reactive because of its highly strained tetrahedral structure.      (1987 - 1 Mark)

Ans. white/ yellow

Solution. white/ yellow; NOTE : In white phosphorus, each phosphorus atom is linked to the other three atoms by covelent bonds. PPP bond angle is 60°, due to which the molecule remains under strain and hence is active in nature.


Q.7. ............... acid gives hypo ............... ion.         (1988 - 1 Mark)

(hydrobromic, hypobromous, perbromic, bromide, bromite, perbromate)

Ans. hypobromous, bromide

Solution. Hypobromous; bromite.  Fill Ups of The p-Block Elements , Past Year Questions JEE Advance, Class 12, Chemistry JEE Notes | EduRev


Q.8. Sulphur acts as ............... agent in vulcanization of rubber.             (1989 - 1 Mark)

Ans. cross -linking

Solution. cross-linking;


Q.9. The basicity of phosphorous acid (H3PO3) is ............... .                  (1990 - 1 Mark)

Ans. two

Solution.   Fill Ups of The p-Block Elements , Past Year Questions JEE Advance, Class 12, Chemistry JEE Notes | EduRev [It contains two replaceable hydrogens.]


Q.10. The hydrolysis of alkyl substituted chlorosilan es gives .............. .

Ans. silicones

Solution. Silicones;


Q.11. In P4O10, the number of oxygen atoms bonded to each phosphorus atom is ............... .           (1992 - 1 Mark)

Ans. 4

Solution. four.  Fill Ups of The p-Block Elements , Past Year Questions JEE Advance, Class 12, Chemistry JEE Notes | EduRev

In each P atom is linked to 4 oxygen atoms


Q.12. The lead chamber process involves oxidation of SO2 by atomic oxygen under the influence of ............... as catalyst.               (1992 - 1 Mark)

Ans. Nitric oxide

Solution. Nitric oxide. [NO]

The mixture containing SO2, air and nitric oxide, when treated with steam, sulphuric acid is formed.

Fill Ups of The p-Block Elements , Past Year Questions JEE Advance, Class 12, Chemistry JEE Notes | EduRev


Q.13. The hydrolysis of trialkylchlorosilane R3SiCl, yields ...........                      (1994 - 1 Mark)

Ans. trialkylchlorosilanol

Solution. Trialkylchlorosilanol; The hydrolysis of R3SiCl, yields R3Si(OH) which condenses to give R3 Si – O – SiR3

Fill Ups of The p-Block Elements , Past Year Questions JEE Advance, Class 12, Chemistry JEE Notes | EduRev


Q.14. One recently discovered allotrope of carbon (e.g., C60) is commonly known as...........                 (1994 - 1 Mark)
Ans.
 fullerene

Solution. Fullerene


Q.15. Solubility of iodine in water is greatly increased by the addition of iodide ions because of the formation of ........            (1994 - 1 Mark)

Ans.  I3 complex ion

Solution. I3 complex ion   I2 + I ——→ I3-


Q.16. A liquid which is permanently supercooled is frequently called a ........... .           (1997 - 1 Mark)

Ans. glass

Solution. glass


Q.17. Compounds that formally contain Pb4+ are easily reduced to Pb2+. The stability of the lower oxidation state is due to ........... . (1997 - 1 Mark)

Ans. inert-pair effect

Solution. inert-pair effect ; When ns2 electrons of outermost shell do not participate in bonding it is called inert pair and the effect is called inert pair effect.

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