Ncert Solutions Chemistry Class 12th

The spin- only magnetic moment value of the most basic oxide of vanadium among V₂O₃, V₂O₄ and V₂O₅ is _____________B. M (Nearest integer)

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Most basic oxide V₂O₃

Here V has +3 O.S. Hence V⁺³ -> $[A r] 3 d^{2}$

two unpaired e^- in d- subshell

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Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : Dacron is an example of polyester polymer.

Reason R : Dacron is made up of ethylene glycol and terephthalic acid monomers.

In the light of the above statements, choose the most appropriate answer from the options given below.

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Kindly consider the following figure

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2.0g of H₂ gas is adsorbed on 2.5g platinum powder at 300K and 1 bar pressure. The volume of the gas adsorbed per gram of the adsorbent is ______________mL.

(Given : R = 0.083 L bar K^-¹ mol^-¹)

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Volume of H₂ adsorbed = $\frac{n R T}{P} = \frac{2 * 0.083 * 300}{2 * 1} = 24.9 l i t = 24900 m l$

Therefore volume of gas adsorbed per gram of the adsorbent = $\frac{24900}{2.5} = 9960$

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In Friedel-Crafts alkylation of aniline, one gets

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Aniline show acid-base reaction with AlCl₃

aniline is a Lewis base while AlCl₃ acts as lewis acid.

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Ncert Solutions Chemistry Class 12th Environmental chemistry

Two isomers (A) and (B) with molar mass 184 g/mol and elemental composition C, 52.2%; H. 4.9% and Br 42.9% gave benzoic acid and p-bromobenzoic acid respectively on oxidation with KMnO₄. Isomer ‘A’ is optically active and gives a pale yellow precipitate when warmed with alcoholic AgNO₃. Isomer ‘A’ and ‘B’ are respectively

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Sulphur dioxide is one of the components of polluted air. SO₂ is also a major contributor to acid rain. The correct and complete reaction to represent acid rain caused by SO₂ is

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Complete reaction of acid rain is

$2 S O_{2} + O_{2} + 2 H_{2} O \overset{}{\to} 2 H_{2} S O_{4} (a c i d r a i n)$

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Which statement is not true with respect to nitrate ion test?

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Brown ring is formed due to nitrosoferrous sulphate formation.

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A chemical which stimulates the secretion of pepsin is:

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Histamine is the chemical which stimulates the secretion of pepsin in stomach.

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Which of the following sets are correct regarding polymer?

(A) Copolymer: Buna-S

(B) Condensation polymer: Nylon-6,6

(C) Fibres: Nylon-6,6

(D) Thermosetting polymer: Terylene

(E) Homopolymer: Buna-N

Choose the correct answer form given options below:

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Buna-S is the copolymer of butadiene and styrene, Nylon-6, 6 is the condensation polymer of adipic acid and diamine and having fibrous nature.

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Given below are two statements:

Statement I : In CuSO₄.5H₂O, Cu-O bonds are present

Statement II : In CuSO₄.5H₂O, ligands coordinating with Cu(II) ion are O- and S- based ligands

In the light of the above statements, choose Correct answer from the options given below:

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