Chemistryhydrogen2020easy
Amongst the following, the form of water with
the lowest ionic conductance at 298 K is :
Chemistryhydrogen2020medium
Among the statements (a) - (d), the correct ones are :
(a) Decomposition of hydrogen peroxide gives dioxygen.
(b) Like hydrogen peroxide, compounds, such as KCIO3, Pb(NO3)2 and NaNO3 when heated liberate dioxygen.
(c) 2-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide.
(d) Hydrogen peroxide is used for the manufacture of sodium perborate.
Chemistryhydrogen2020easy
In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins
method is :
Chemistrysolid-state2020easy
Which of the following compounds is likely to
show both Frenkel and Schottky defects in its
crystalline form?
Chemistrysolid-state2020medium
A diatomic molecule X2
has a body-centred cubic
(bcc) structure with a cell edge of 300 pm. The
density of the molecule is 6.17 g cm–3. The number
of molecules present in 200 g of X2
is :
(Avogadro constant (N
A) = 6 1023 mol–1
)
Chemistrysolid-state2020medium
An element crystallises in a face-centred cubic (fcc) unit cell with cell edge . The distance
between the centres of two nearest octahedral voids in the crystal lattice is :
Chemistrysolid-state2020medium
A crystal is made up of metal ions 'M1' and 'M2'
and oxide ions. Oxide ions form a ccp lattice
structure. The cation 'M1' occupies 50% of
octahedral voids and the cation 'M2' occupies
12.5% of tetrahedral voids of oxide lattice. The
oxidation numbers of 'M1' and 'M2' are,
respectively :
Chemistryhaloalkanes-and-haloarenes2020medium
The mechanism of SN1 reaction is given as :
A student writes general characteristics based
on the given mechanism as :
(a) The reaction is favoured by weak
nucleophiles.
(b) R+ would be easily formed if the
substituents are bulky.
(c) The reaction is accompanied by
racemization.
(d) The reaction is favoured by non-polar
solvents.
Chemistryhaloalkanes-and-haloarenes2020easy
The major product in the following reaction is :
Chemistryhaloalkanes-and-haloarenes2020medium
The decreasing order of reactivity of the
following compounds towards nucleophilic
substitution (SN2) is :
Chemistryhaloalkanes-and-haloarenes2020medium
The decreasing order of reactivity of the
following organic molecules towards AgNO3
solution is :
Chemistryhaloalkanes-and-haloarenes2020medium
Among the following compounds, which one
has the shortest C – Cl bond?
Chemistryhaloalkanes-and-haloarenes2020medium
Which of the following compounds will form the
precipitate with aq. AgNO3 solution most
readily?
Chemistryhaloalkanes-and-haloarenes2020medium
The major product formed in the following reaction is :
CH3CH = CHCH(CH3)2 \buildrel {HBr} \over
\longrightarrow
Chemistryhaloalkanes-and-haloarenes2020medium
The increasing order of the boiling points of
the major products A, B and C of the following
reactions will be :
Chemistryhaloalkanes-and-haloarenes2020medium
For the following reactions
Ks and Ke, are respectively, the rate constants for substitution and elimination and \mu = {{{k_s}} \over {{k_e}}} the
correct options is
Chemistryhaloalkanes-and-haloarenes2020medium
The major product obtained from
E2 - elimination of 3-bromo-2-fluoropentane is
Chemistryhaloalkanes-and-haloarenes2020medium
Which of the following compunds will show
retention in configuration on nucleophilic
substitution by OH– ion?
Chemistryhaloalkanes-and-haloarenes2020medium
Which of the following reactions will not
produce a racemic product?
Chemistryhaloalkanes-and-haloarenes2020medium
Which of these will produce the highest yield
in Friedel Crafts reaction?