Consider the molecules ``CH_4, NH_3 and H_2O``.
Which of the given statements is false ?
(1) The H-C-H bond angle in ``CH_4``, the H-N-H
bond angle in ``NH_3``, and the H-O-H bond angle
in ``H_2O`` are all greater than 90°
(2) The H-O-H bond angle in ``H_2O`` is larger than
the H-C-H bond angle in ``CH_4``.
(3) The H-O-H bond angle in ``H_2O`` is smaller than
the H-N-H bond angle in ``NH_3``.
(4) The H-C-H bond angle in ``CH_4`` is larger than
the H-N-H bond angle in ``NH_3``.

In the reaction

X and Y are :
(1) X = 1-Butyne ; Y = 3-Hexyne
(2) X = 2-Butyne ; Y = 3-Hexyne
(3) X = 2-Butyne ; Y = 2-Hexyne
(4) X = 1-Butyne ; Y = 2-Hexyne

Among the following, the correct order of acidity is
(1) ``\ce { HClO3 < HClO4 < HClO2 < HClO} ``
(2) ``\ce { HClO < HClO2 < HClO3 < HClO4} ``
(3) ``\ce { HClO2 < HClO < HClO3 < HClO4} ``
(4) ``\ce { HClO4 < HClO2 < HClO < HClO3} ``

The rate of a f irst -order react ion is
0.04 mol ``l^{-1} s^{-1}`` at 10 seconds and
0.03 mol ``l^{-1} s^{-1}``at 20 seconds after initiation of the
reaction. The half-life period of the reaction is :
(1) 24.1 s
(2) 34.1 s
(3) 44.1 s
(4) 54.1 s

Which one of the following characteristics is
associated with adsorption ?
(1) ``\triangle``G is negative but ``\triangle``H and ``\triangle``S are positive
(2) ``\triangle``G, ``\triangle``H and ``\triangle``S all are negative
(3) ``\triangle``G and ``\triangle``H are negative but ``\triangle``S is positive
(4) ``\triangle``G and ``\triangle``S are negative but ``\triangle``H is positive

In which of the following options the order of
arrangement does not agree with the variation of
property indicated against it ?
(1) ``\ce {Al^3+ < Mg^2+ < Na+ < F- } ``(increasing ionic size)
(2) B < C < N < O (increasing first ionisation enthalpy)
(3) I < Br < Cl < F (increasing electron gain
enthalpy)
(4) Li < Na < K < Rb (increasing metallic radius)

Which of the following statements is false ?
(1) ``Mg^{2+}`` ions form a complex with ATP
(2) ``Ca^{2+}`` ions are important in blood clotting
(3) ``Ca^{2+}`` ions are not important in maintaining the
regular beating of the heart.
(4)``Mg^{2+}`` ions are important in the green parts of
plants.

Which of the following statements about hydrogen
is incorrect ?
(1) hydrogen has three isotopes of which tritium is
the most common.
(2) Hydrogen never acts as cation in ionic salts
(3) Hydronium ion, ``H_3O^+`` exists freely in solution
(4) Dihydrogen does not act as a reducing agent

The correct statement regarding a carbonyl
compound with a hydrogen atom on its
alphacarbon,is :-
(1) a carbonyl compound with a hydrogen atom on
its alpha-carbon never equilibrates with its
corresponding enol.
(2) a carbonyl compound with a hydrgen atom on
its alpha-carbon rapidly equilibrates with its
corresponding enol and this process is known
as aldehyde-ketone equilibration.
(3) a carbonyl compound with a hydrogen atom on
its alpha-carbon rapidly equilibrates with its
corresponding enol and this process is known
as carbonylation.
(4) a carbonyl compound with a hydrogen atom on
its alpha-carbon rapidly equilibrates with its
corresponding enol and this process is known
as keto-enol tautomerism.

MY and ``NY_3``, two nearly insoluble salts, have the
same ``K_{sp}`` values of 6.2 × ``10^{-13}`` at room
temperature. Which statement would be true in
regard to MY and ``NY_3`` ?
(1) The molar solubilities of MY and ``NY_3`` in water
are identical.
(2) The molar solubility of MY in water is less than
that of ``NY_3``
(3) The salts MY and ``NY_3`` are more soluble in
0.5 M KY than in pure water.
(4) The addition of the salt of KY to solution of MY
and ``NY_3`` will have no effect on their solubilities.

In a protein molecule various amino acids are linked
together by :
(1) ``\alpha``-glycosidic bond
(2) ``\beta``-glycosidic bond
(3) peptide bond
(4) dative bond

Natural rubber has
(1) All cis-configuration
(2) All trans-configuration
(3) Alternate cis-and trans-configuration
(4) Random cis-and trans-configuration

Match items of Column I with the items of
Column II and asign the correct code :
Column-I Column-II
a) Cyanide (i) Ultrapure Ge
process
(b)Froth floatation (ii) Dressing of ZnS
process
(c)Electrolytic (iii) Extraction of Al
reduction
(d) Zone refining (iv) Extraction of Au
(v) Purification of Ni
Code :
a) (b) (c) (d)
(1) (iv) (ii) (iii) (i)
(2) (ii) (iii) (i) (v)
(3) (i) (ii) (iii) (iv)
(4) (iii) (iv) (v) (i)

Which one of the following statements is correct
when ``SO_2`` is passed through acidified ``K_2Cr_2O_7``
solution ?
(1) The solution turns blue
(2) The solution is decolourized
(3) ``SO_2`` is reduced
(4) Green ``Cr_2(SO_4)_3`` is formed