IIT-JEE-Chemistry-Paper1-2007

Paper 1

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10.    STATEMENT-1

        Boron always forms covalent bond

        Because

        STATEMENT-2

        The small size of B³⁺ favours formation of covalent bond.

(A)    Statement-1 is True, Staement-2 is True, Statement-2 is a correct explanation for statement-1.

(B)    Statement-1 is True, Staement-2 is True, Statement-2 is not a correct explanation for statement-1.

(C)    Statement-1 is True, Statement-2 is False

(D)    Statement-1 is False, Statement-2 is True

11.    STATEMENT-1

        In water, orthoboric acid behaves as a weak monobasic acid.

        Because

        STATEMENT-2

        In water, orthoboric acid acts as a proton donor.

(A)    Statement-1 is True, Staement-2 is True, Statement-2 is a correct explanation for statement-1.

(B)    Statement-1 is True, Staement-2 is True, Statement-2 is not a correct explanation for statement-1.

(C)    Statement-1 is True, Statement-2 is False

(D)    Statement-1 is False, Statement-2 is True

12.    STATEMENT-1

p-Hydroxybenzoic acid has a lower boiling point than o-hydroxybenzoic acid.

        Because

        STATEMENT-2

        o-Hydroxybenzoic acid has intramolecular hydrogen bonding.

(A)    Statement-1 is True, Staement-2 is True, Statement-2 is a correct explanation for statement-1.

(B)    Statement-1 is True, Staement-2 is True, Statement-2 is not a correct explanation for statement-1.

(C)    Statement-1 is True, Statement-2 is False

(D)    Statement-1 is False, Statement-2 is True

13.    STATEMENT-1

Micelles are formed by surfactant molecules above the critical miceller concentration (CMC).

Because

STATEMENT-2

The conductivity of a solution having surfactant molecules decreases sharply at the CMC.

(A)    Statement-1 is True, Staement-2 is True, Statement-2 is a correct explanation for statement-1.

(B)    Statement-1 is True, Staement-2 is True, Statement-2 is not a correct explanation for statement-1.

(C)    Statement-1 is True, Statement-2 is False

(D)    Statement-1 is False, Statement-2 is True

14.    Argon is used in arc welding because of its

        (A)    low reactivity with metal

        (B)    ability to lower the melting point of metal

        (C)    flammability

        (D)    high calorific value

15.    The structure of XeO₃ is

        (A)    linear

        (B)    planar

        (C)    pyramidal

        (D)    T-shaped

16.    XeF₄ and XeF₆ are expected to be

        (A)    oxidizing

        (B)    reducing

        (C)    unreactive

        (D)    strongly basic

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