Class 12th

Contributor-Level 10

Here, C₃H₆ is propene

Second reaction is iodoform reaction.

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In the electrolytic refining of blister copper, the total number of main impurities, from the following, removed as anode mud is _________.

Pb, Sb, Se, Te, Ru, Ag, Au and Pt

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Contributor-Level 10

Impurities present in electrolytic refining of blister Cu, removed as anode mud

= Sb, Se, Te, Ag, Au, Pt

Ans. = 6

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Number of paramagnetic oxides among the following given oxides is_________.

Li₂O, CaO, Na₂O₂, KO₂, MgO and K₂O

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Class 12th Chemical Kinetics

Contributor-Level 10

Given are the oxide of alkali and alkaline earth metals which are ionic in nature.

Simple oxide are Li₂O, CaO, MgO and K₂O.

Peroxide is Na₂O₂ and superoxide is KO₂.

All simple oxides are diamagnetic as it has no unpaired electron.

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For the reaction A -> B, the rate constant K(in s^-1) is givne by

$l o g_{10} K = 20.35 - \frac{(2.47 * 1 0^{3})}{T} .$

The energy of activation in KJ mol^-1 is ______. (Nearest integer)

[Given : R = 8.314 J K^-1 mol^-1]

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Contributor-Level 10

log k = 20.35 - $\frac{(2.47 * 1 0^{3})}{T}$

Comparing with,

$l o g k = l o g A - \frac{E a}{2.303 R T}$

$\frac{E a}{2.303 R} = 2.47 * 1 0^{3}$

= 47.29 kJ/mole

Ans. = 47

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1.22 g of an organic acid is separately dissolved in 100 g of benzene (K_b = 2.6 K kg mol^-1) and 100 g of acetone (K_b = 1.7 K kg mol^-1). The acid is known to dimerize in benzene but remain as a monomer in acetone. The boiling point of the solution in acetone increases by 0.17°C. The increase in boiling point of solution in benzene in °C is x * 0^-2. The value of x is ________. (Nearest integer)

[Atomic mass : C = 12.0, H = 1.0, O = 16.0]

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Contributor-Level 10

$Δ T_{b} = i K_{b} m$ $_{}_{}$

$m = \frac{w * 1000}{M * W_{s o l v e n t}}$

For acetone solution,

$0.17 = 1 * 1.7 * \frac{1.22 * 1000}{M * 100}$

For Benzene solution,

$2 A c i d \to {(A c i d)}_{2} ∴ i = 1 / 2$

$Δ T_{b} = i * K_{b} * m$

$= \frac{1}{2} * 2.6 * \frac{1.22 * 1000}{122 * 100} ° C$

= $0.13 ° C = 13 * 1 0^{- 2} ° C$ $^{}$

$∴ x * 1 0^{- 2} = 13 * 1 0^{- 2}$

$∴ x = 13$

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The empirical formula for a compound with a cubic close packed arrangement of anions and with cations occupying all the octahedral sites is A_xB. The value of x is _______.

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Contributor-Level 10

Effective number of atom in C.C.P

$∴ = \frac{1}{8} * 8 + \frac{1}{2} * 6$

= 4

Number of octahedral void = 4

Number of cations = 4

Number of anion = 4

Formula of compound = A₄B₄

Empirical formula = AB

Ans. x = 1

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Class 12th Physics

A carrier wave with amplitude of 250 V is amplitude modulated by a sinusoidal base band signal of amplitude 150V. The ratio of minimum amplitude to maximum amplitude for the amplitude modulated wave is 50 : x, then value of x is__________.

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Contributor-Level 10

$A_{m a x} = A_{c} + A_{m}$

$A_{m i n} = A_{c} - A_{m}$

$\frac{A_{m i n}}{A_{m a x}} = \frac{A_{c} - A_{m}}{A_{c} + A_{m}} = \frac{250 - 150}{250 + 150}$

$\Rightarrow \frac{100}{400} = \frac{50}{200}$

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Class 12th Maths

An electric instrument consists of two units. Each unit must function independently for the instrument to operate. The probability that the first unit functions is 0.9 and that of the second unit is 0.8. The instrument is switched on and it fails to operate. If the probability that only the first unit failed and second unit is functioning is p, then 98 p is equal to________.

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Raj Pandey

Contributor-Level 9

P (E₁)= 0.9 $P ({\bar{E}}_{t}) = 0.1 a n d P (E_{2}) = 0.8, P ({\bar{E}}_{2}) = 0.2$

$∴ R e q u i r e d p r o b a b i l i t y P = \frac{0.8 * 0.1}{0.8 * 0.1 + 0.2 * 0.1 + 0.9 * 0.2} = \frac{0.8}{2.8} = \frac{2}{7}$

$∴ 98 P = 28$

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Class 12th English

Answer the questions on the basis of the information given below.

In a school when a survey is conducted on liking of subjects out of three subjects physics, chemistry mathematics then outcome is as follow.

Total number of students who like physics, chemistry and mathematics is 30, 40, 50 respectively. 10 students shown interest in all three subjects, Number of students who like physics and mathematics both is equal to number of students who like chemistry and mathematics both and is equal to 3/4 times number of students who like physics and chemistry both 15 students like only chemistry.

When class teacher saw this survey report he to

...more

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