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nikhil04
@nikhil04
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Joined: Aug 19, 2020
Last seen: Jan 13, 2022
Topics: 0 / Replies: 1353
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Answer to: A set of solutions is prepared using 180 g of water as a solvent and 10 g of different non-volatile solutes A, B and c.

(1) A > B > C Explanation: Relative lowering in vapour pressure depends on no. of mole of solute greater the no. of mole of solute greater i...

3 years ago
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Answer to: Match the following compounds (Column-I) with their uses (Column-II): Column-I - Column-I (I) Ca(OH)2 - (A) casts of statues

(2) (I)-(B), (II)-(D), (III)-(A), (IV)-(C) Explanation: (i) Ca(OH)2 is used in white wash. (ii) Plaster of paris is used in making of molds for...

3 years ago
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Answer to: Dihydrogen of high purity (>99.95%) is obtained through:

(1) The electrolysis of warm Ba(OH)2 solution using Ni elecrrodes. Explanation: Dihydrogen of high degree of purity (>99.95%) is obtained by th...

3 years ago
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Answer to: Mischmetal is an alloy consisting mainly of:

(1) Lanthanoid metals Explanation: Misch metal consists of Lanthanide metal (≈95%) and iron (≈5%) and traces of S, C, Ca and Al.

3 years ago
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Answer to: The element that can be refined by distillation is:

(1) zinc Explanation: Zn, Cd & Hg are purified by fractional distillation process.

3 years ago
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Answer to: In an estimation of bromine by Carius method, 1.6 g of an organic compound gave 1.88 g of AgBr.

If molar mass of compound is M 1.6/M = 1.88/188 = 0.01 so m = 160 gram/mole Now %of bromine = 80/160 × 100 % = 50%

3 years ago
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Answer to: A spherical balloon of radius 3 cm containing helium gas has a pressure of 48 × 10^–3 bar.

If volume of 3 cm balloon is = V then volume of 12 cm radius balloon = 64V So pressure will become 1/64 times = 1/64 × 48 × 10–3 bar = 750 × 10–...

3 years ago
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Answer to: Potassium chlorate is prepared by the electrolysis of KCl in basic solution

= {2 × t × 60 × 60 / 96500} × 0.60 × 122 × (1/6) = 10 So t = 10.98 hours

3 years ago
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Answer to: The number of Cl= O bonds in perchloric acid is, “………….”

Perchloric acid => HClO4 Total Cl = O bonds = 3  2s.png

3 years ago
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Answer to: The elevation of boiling point of 0.10 m aqueous CrCl3.xNH3 solution is two times that of 0.05 m aqueous CaCl2 solution.

0.05 m aqueous CaCl2 solution = 0.15 molal solution of non electrolyte. Since the elevation in boiling point is double so the molality of given sol...

3 years ago
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Answer to: The INCORRECT statement is : (1) bronze is an alloy of copper and tin.

(2) brass is an alloy of copper and nickel. Explanation: Alloy Composition 1. Bronze - Cu (75 – 90%) + Sn (10, 25%) 2. Br...

3 years ago
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Answer to: The correct statement with respect to dinitrogen is :

(4) it can be used as an inert diluent for reactive chemicals. Explanation: (1) liquid dinitrogen is used in cryosurgery. (2) N2 is diamagnetic...

3 years ago
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Answer to: The species that has a spin-only magnetic moment of 5.9 BM, is :

(4) [MnBr4]2- (Td) Explanation: (1) Ni(CO)4 - 3d10 - 0 (2) [Ni(CN)4]2- 3d8 0 (3) [NiCl4]2- 3d8 0 (4) [MnBr4]2- 3d5 0

3 years ago
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Answer to: Consider the Assertion and Reason given below. Assertion (A) : Ethene polymerized in the presence of Ziegler Natta Catalyst

(2) Both (A) and (R) are correct and (R) is the correct explanation of (A). Explanation: High density polythene: It is formed when addition polyme...

3 years ago
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Answer to: The lanthanoid that does NOT show +4 oxidation state is:

(4) Eu Explanation: Cu(z = 63) = 4F76s2 Dy(z = 66) = 4F106s2 Tb(z = 65) = 4F96s2 Ce(58) = 4F15d16s2 Dy, Tb and Ce show +4 oxidation state ...

3 years ago
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Answer to: Kraft temperature is the temperature : (1) above which the aqueous solution of detergents starts boiling.

(3) above which the formation of micelles takes place. Explanation: (i) Micelles formation take place only above a particular temperature called a...

3 years ago
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Answer to: For the reaction Fe2N(s) + 3/2H2(g) ⇌ 2Fe(s) + NH3(g)

(3) Kc = Kp(RT)1/2 Explanation: Kc = Kp(RT)Δng = Kc = Kp(RT)1/2 as Δng = 1/2

3 years ago
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Answer to: Consider the following reactions A → P1 ; B → P2 ; C → P3 ; D → P4, The order of the above reactions are a, b, c and d, respectively.

(1) d > b > a > c Explanation: Rate = K[Conc]order logRate = log K + order log[conc] so slope of graph is order of reaction. greate...

3 years ago
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Answer to: The set that contains atomic numbers of only transition elements, is :

(3) 21, 25, 42, 72 Explanation: A transition element is defined as the one which has incompletely filled d orbitals in its ground state or in any ...

3 years ago
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Answer to: Which of the following compounds shows geometrical isomerism?

(3) 4-methylpent-2-ene Explanation: Can show G.I. because both doubly bonded carbon have two different groups.  2s.png

3 years ago
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