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The electronic configuration of bivalent europium and trivalent cerium, are: (Atomic Number : Xe = 54, Ce = 58, Eu = 63)

a) [Xe]4f 7, [Xe]4f 1b) [Xe]4f 76s2 , [Xe]4f 26s2c) [Xe]4f 2, [Xe]4f 7d) [Xe]4f 4, [Xe]4f 9Solution:Ce (58): [Xe] 6s24f 2 (g.s)Ce3+: [Xe]4f1... View Article

Complex X of composition Cr(H₂O)₆Cl_n, has a spin only magnetic moment of 3.83 BM. It reacts with AgNO₃and shows geometrical isomerism. The IUPAC nomenclature of X is

a) Hexaaqua chromium(III) chlorideb) Tetraaquadichlorido chromium(III) chloride dihydratec) Hexaaquachromium(IV) chlorided) Tetraaquadichlorido... View Article

Which of the following oxides are acidic, basic and amphoteric, respectively?

a) MgO, Cl2O, Al2O3b) N2O3, Li2O, Al2O3c) SO3, Al2O3, Na2Od) P4O10, Cl2O, CaOSolution:Non-metallic oxides are acidic in nature, metallic oxides... View Article

If enthalpy of atomisation for Br₂(l) is x kJ/mol and bond enthalpy for Br₂ is y kJ/mol, the relation between them:

a) is x > yb) is x < yc) is x = yd) does not existSolution: ΔHatomisation = ΔHvap + yx − y = ΔHvapAnswer: (a)... View Article

If the magnetic moment of a dioxygen species is 1.73 B.M, it may be:

a) O2, O2-, or O2+b) O2-, or O2+c) O2 or O2-,d) O2, O2+Solution: Answer: (b)... View Article

The de Broglie wavelength of an electron in the 4th Bohr orbit is:

a) 4πa0b) 42πa0c) 8πa0d) 6πa0Solution:n=4Z = 1 , λ= ? Circumference (2πr)= nλ2πa0n2/z = nOn solving, we get= 8πao Answer:(c)... View Article

Complexes [ML₅] of metals Ni and Fe have ideal square pyramidal and trigonal bipyramidal and geometries, respectively. The sum of the 90⁰, 120⁰ and 180⁰ L-M-L angles in the two complexes is

Solution:> For trigonal bipyramidal geometry Total number of 1800 L-M-L bond angles = 1 Total number of 900 L-M-L bond angles = 6 Total... View Article

NaClO₃ is used, even in spacecrafts, to produce O₂

NaClO3 is used, even in spacecrafts, to produce O2. The daily consumption of pure O2 by a person is 492 L at 1 atm, 300 K. How much amount of... View Article

For an electrochemical cell

For an electrochemical cell The ratio [Sn2+]/[Pb2+] when this cell attains equilibrium is ______. Solution:Anodic half: Sn → Sn 2+ +... View Article

Two monomers of maltose are:

a. alpha-D-Glucose and alpha-D-Galactoseb. alpha-D-Glucose and alpha-D-Glucosec. alpha-D-Glucose and alpha-D-Fructosed. alpha-D-Glucose and... View Article

Preparation of Bakelite proceeds via reactions:

a. Electrophilic substitution and dehydration.b. Electrophilic addition and dehydration.c. Condensation and eliminationd. Nucleophilic addition... View Article

An unsaturated hydrocarbon absorbs two hydrogen molecules on catalytic hydrogenation, and also gives following reaction

An unsaturated hydrocarbon absorbs two hydrogen molecules on catalytic hydrogenation, and also gives following reaction; will be:... View Article

Kjeldahl’s method cannot be used to estimate nitrogen for which of the following compounds?

a. 3 2 − ≡ b. 6 5 2c. 6 5 2d. Solution:Kjeldahl method cannot be used for the estimation of nitrogen in the compounds in which nitrogen is... View Article

Among the following compounds A and B with molecular formula

Among the following compounds A and B with molecular formula C9H18O3, A is having higher boiling point than B. The possible structures of A and B... View Article

Find The major product [B] of the following sequence of reactions is

Find The major product [B] of the following sequence of reactions is:Answer to this question is option cExplanation:... View Article

The major product of the following reactions is:

The major product of the following reactions is:Answer to this question is option dExplanation:... View Article

For the following Assertion and Reason, pick the correct option

Assertion: For hydrogenation reactions, the catalytic activity increases from group-5 to group11 metals with maximum activity shown by group 7-9... View Article

Among (a) – (d), the complexes that can display geometrical isomerism are:

A. [Pt(NH3)3Cl]+ B. [Pt(NH3)Cl5]C. [Pt(NH3)2Cl(NO2)]D. [Pt(NH3)4ClBr] 2+a. A and Bb. D and Ac. C and Dd. B and CSolution:The complexes of type... View Article

The increasing order of the atomic radii of the following elements is:

A. CB. OC. FD. ClE. Bra. B<C<D<A<Eb. C<B<A<D<Ec. A<B<C<D<Ed. D<C<B<A<E lSolution:Across the... View Article

Among the reactions (a) – (d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are:

A. CaO + SiO2→ CaSiO3 B. 3Fe2O3 + CO → 2Fe3O4 + CO2C. FeO +SiO2 →FeSiO3 D. FeO → Fe + (1/2)O2 a. Ab. Dc. C and Dd. A and DSolution:In metallurgy... View Article

M	T	W	T	F	S	S
	1	2	3	4	5	6
7	8	9	10	11	12	13
14	15	16	17	18	19	20
21	22	23	24	25	26	27
28	29	30