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Chemistry NCERT Exemplar Solutions Class 12th Chapter Thirteen

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2 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Thirteen Amines

Polar stratospheric clouds facilitate the formation of

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Payal Gupta

Contributor-Level 10

HOCl produce in the stratospheric cloud, by the hydrolysis reaction of ClONO₂.

$C l O N O_{2 (g)} + H_{2} O_{(g)} \to H O C l_{(g)} + H N O_{3 (v a p)}$

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Thirteen Hydrocarbons

Two isomers 'A' and 'B' with molecular formula C₄H₈ give different products on oxidation with KMnO₄ is acidic medium. Isomer 'A' on reaction with KMnO₄/H⁺ results in effervescence of a gas and given ketone. The compound 'A' is

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alok kumar singh

Contributor-Level 10

C₄H₈ (DOU = 1 so 1 double bond exist since it gives KMnO₄ test)

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Thirteen Amines

Ceric ammonium nitrate and CHCl₃/alc. KOH are used for the identification of functional groups present in…………. and……………respectively.

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Payal Gupta

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Ceric ammonium nitrate is used to test alcohol while CHCl₃/alc. KOH is used to test 1° amine

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Thirteen Chemistry NCERT Exemplar Solutions Class 12th Chapter Sixteen

How many of the following drugs is/are example(s) of broad spectrum antibiotics?

Ofloxacin, Penicillin G, Terpineol, Salvarsan.

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alok kumar singh

Contributor-Level 10

Ofloxacin is the only broad spectrum antibiotic given in the question.

Pencillin – G is narrow spectrum antibiotic.

Salvarsan is mainly active against spirochete, a bacteria that causes syphilis.

Terpineol is an antiseptic.

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Thirteen Chemistry NCERT Exemplar Solutions Class 12th Chapter Ten

A 100 mL solution of CH₃CH₂MgBr on treatment with methanol produces 2.24 mL of a gas at STP. The weight of gas produced is __________ mg. [nearest integer]

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alok kumar singh

Contributor-Level 10

Moles of C₂H₆ = $\frac{2.24 * 1 0^{- 3}}{22.4} = 1 0^{- 4}$

Weight of C₂H₆ = 10^-4 * 30 = 3 mg

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Thirteen Chemistry NCERT Exemplar Solutions Class 12th Chapter Twelve

Total number of isomers (including stereoisomers) obtained on monochlorination of methylcyclohexane is_______________.

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alok kumar singh

Contributor-Level 10

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Thirteen Chemistry NCERT Exemplar Solutions Class 12th Chapter Eight

The spin-only magnetic moment value of the compound with strongest oxidizing ability among MnF₄, MnF₃ and MnF₂ is_________B.M [nearest integer]

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alok kumar singh

Contributor-Level 10

$\overset{+ 4}{M n F_{4}}$ $\overset{+ 3}{M n F_{3}}$

E.C = [Ar] 3d³ [Ar]3d⁴

$\begin{matrix} \overset{+ 2}{M n F_{2}} & [A r] 3 d^{5} \end{matrix} [\begin{array}{l} E_{M n^{3 +} | M n^{2 +}}^{0} = 1.57 V \\ E_{M n^{4 +} | M n^{2 +}}^{0} = 1.27 V \end{array}]$

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Thirteen Chemistry NCERT Exemplar Solutions Class 12th Chapter Ten

The number of non-ionisable protons present in the product B obtained from the following reaction is______________.

C₂H₅OH + PCl₃ ® C₂H₅Cl + A

A + PCl₃ ® B

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alok kumar singh

Contributor-Level 10

$C_{2} H_{5} O H + P C l_{3} \to C_{2} H_{5} C l + H_{3} P O_{3}$

$H_{3} P O_{3} + P C l_{3} \to H_{4} P_{2} O_{5} + H C l$

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Thirteen Electrochemistry

20mL of 0.02 M hypo solution is used for the titration of 10mL of copper sulphate solution, in the presence of excess of KI using starch as an indicator. The molarity of Cu²⁺ is found to be__________* 10^-2 M. [nearest integer]

Given: 2Cu²⁺ + 4I^- ® Cu₂I₂ + I₂

I₂ + $2 S_{2} O_{3}^{2 -} \to 2 I^{-} + S_{4} O_{6}^{2 -}$

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alok kumar singh

Contributor-Level 10

$m e q o f l_{2} = m e q o f N a_{2} S_{2} O_{3} = 20 * 0.002 * 1$

2 * mmol of l₂ = 0.4

mmol of l₂ = 0.2 mmol

mmol of Cu²⁺ = 0.2 * 2 * 10^-3

$[C u^{2 +}] = \frac{0.4 * 1 0^{- 3}}{10 * 1 0^{- 3}} = 0.04 = 4 * 1 0^{- 2} M$

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Chemistry NCERT Exemplar Solutions Class 12th Chapter Thirteen Chemistry NCERT Exemplar Solutions Class 12th Chapter Two

The elevation in boiling point for 1 molal solution of non-volatile solute A is 3K. The depression in freezing point for 2 molal solution of A in the same solvent is 6 K. The ratio of K_b and K_f i.e. K_b/K_f is 1 : X. The value of X is [nearest integer]

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alok kumar singh

Contributor-Level 10

$Δ T_{b} = i K_{b} m_{1}$

$\frac{Δ T_{b}}{Δ T_{f}} = \frac{K_{b} * 1}{K_{f} * 2} \Rightarrow \frac{3}{6} = \frac{1}{2} = \frac{K_{b}}{k_{f}} * \frac{1}{2}$

$\frac{K_{b}}{K_{f}} = 1 \Rightarrow x = 1$

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