Ncert Solutions Chemistry Class 12th

Given below are two statements. One is labeled as Assertion A and the other is labeled as Reason R.

Assertion A: Activated charcoal adsorbs SO₂ more efficiency than CH₄.

Reason R: Gases with lower critical temperature are readily adsorbed by activated charcoal.

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

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SO₂ is absorbed to a greater extent then CH₄ on activated charcoal under same Gases with higher critical temperature are readily absorbed by activated charcoal.

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250g solution of D-glucose in water contains 10.8% of carbon by weight. The molality of the solution is nearest to

(Given : Atomic weights are, H, 1u ; C, 12u ; O, 16u)

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$C_{6} H_{12} O_{6} \to G l u c o s e$

$\frac{M a s s o f C}{m a s s o f g l u c o s e} = \frac{72}{180}$

% of C = 10.8 = $\frac{M a s s o f C}{m a s s o f s o l u t i o n} * 100$

$\frac{10.8 * 250}{100} m a s s o f C$

$∴ M o l a r i t y = \frac{0.375}{0.1825} = 2.055 = 2.06$

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A compound 'X' is a weak acid and it exhibits colour change at pH close to the equivalence point during neutralization of NaOH with CH₃COOH. Compound 'X' exists in ionized form in basic medium. The compound 'X' is

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Phenolphthalein is the indicator of weak acid which produces pink colour in basic medium.

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For kinetic study of the reaction of iodide ion with H₂O₂ at room temperature:

(A) Always use freshly prepared starch solution.

(B) Always keep the concentration of sodium thiosulphate solution less than that of Kl solution.

(C) Record the time immediately after the appearance of blue colour.

(D) Record the time immediately before the appearance of blue colour.

(E) Always keep the concentration of sodium thiosulphate solution more than that of Kl solution.

Choose the correct answer from the options given below:

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Always fresh solution of starch used and recorded immediately after the blue colour appears. Na2S2O3 is used in limited amount.

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Statement about Enzyme Inhibitor Drugs are given below:

(A) There are Competitive and Non-competitive inhibitor drugs.

(B) These can bind at the active sites and allosteric sites.

(C) Competitive Drugs are allosteric site blocking drugs.

(D) Non-competitive Drugs are active site blocking drugs.

Choose the correct answer from the options given below:

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Enzyme inhibitors are competitive inhibitors if they inhibit the attachment of substrate on active site of enzyme. Enzyme inhibitors are non- competitive inhibitors if they changes the active site of enzyme after binding at allosteric site.

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Which of the following is NOT a natural polymer?

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Rayon is the semi synthetic polymer.

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Terylene polymer is obtained by condensation of:

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Kindly consider the following figure

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The Hinsberg reagent is

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Benzyl sulphonyl chloride is called Hinsberg's reagent.

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Identify the correct statement for the below given transformation.

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-> Hofmann product that is less substituted product is the major product.

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When ethanol is heated with conc. H₂SO₄, a gas is produced. The compound formed, when this gas is treated with cold dilute aqueous solution of Baeyer's reagent, is

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