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Class 12th Chemistry

The major product formed in the following reaction, is

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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11 months ago

Class 12th Chemistry

Which of the following condition or reaction sequence will NOT given acetophenone as the major product?

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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11 months ago

Class 12th Chemistry

In the given reaction

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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New answer posted

11 months ago

Class 12th Chemistry

Amongst the following, the major product of the given chemical reaction is

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Vishal Baghel

Contributor-Level 10

Kindly comsider the following figure

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11 months ago

Class 12th Organic Chemistry - Some Basic Principles and Tech

During halogens test, sodium fusion extract is boiled with concentrated HNO₃ to

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Vishal Baghel

Contributor-Level 10

Sodium fusion extract is boiled with conc. HNO₃ to remove NaCN and Na₂S.

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11 months ago

Class 12th Physics

In a series LCR circuit, the inductance, capacitance and resistance are L = 100mH, C = $100 μ F$ and R = $10 Ω$ respectively. They are connected to an AC source of voltage 220V and frequency of 50 Hz. The approximate value of current in the circuit will be……….A.

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alok kumar singh

Contributor-Level 10

$ω = 2 π f = 2 π * 50 = 100 π$

$X_{L} = w L = 100 π * 100 * 1 0^{- 3}$

$X_{C} = \frac{1}{w C} = \frac{1}{100 π} * 100 * 1 0^{- 6} = \frac{100}{π}$

$z = 10.0086 Ω$

$l = \frac{v}{z} = \frac{220}{10.008} = 22 A$

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11 months ago

Class 12th Chemistry Organic Chemistry

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

Assertion A: A mixture contains benzoic acid and naphthalene. THE pure benzoic acid can be separated out by the use of benzene.

Reason R: Benzoic acid is soluble in hot water.

In the light of the above statements, choose the most appropriate answer form the options given below:

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Vishal Baghel

Contributor-Level 10

Benzoic acid & naphthalene can be separated by crystallization. Benzoic acid is soluble is hot water but naphthalene is insoluble.

Assertion is incorrect & Reason is correct.

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11 months ago

Class 12th Physics

The length of a give cylindrical wire is increased to double of its original length. The percentage increase in the resistance of the wire will be…………….%.

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alok kumar singh

Contributor-Level 10

volume of wire will remains constant

$π r_{1}^{2} l_{1} = π r_{2}^{2} l_{2}$

$\Rightarrow l_{2} = 2 l_{1} (G i v e n)$

$r_{2} = \frac{r_{1}}{\sqrt[]{2}}$

$R_{2} = \frac{ρ l_{2}}{π r_{2}^{2}} = \frac{ρ 2 l_{1}}{π {(\frac{r_{1}}{\sqrt[]{2}})}^{2}}$

$= \frac{R_{2} - R_{1}}{R_{1}} * 100 = \frac{4 R_{1} - R_{1}}{R_{1}} * 100 = \frac{3 R_{1}}{R_{1}} * 100 = 300 %$

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11 months ago

Class 12th Environmental chemistry

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

Assertion A: Polluted water may have a value of BOD of the order of 17 ppm.

Reason R: BOD is a measure of oxygen required to oxidize both the biodegradable and non-biodegradable organic material in water

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

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Vishal Baghel

Contributor-Level 10

Assertion : Clean water has BOD less than 5ppm. Highly polluted water has BOD greater than or equal to 17 ppm.

Reason : BOD is measure of oxygen required to oxidize only bio-degradable organic matter.

Thus Assertion (A) is correct & Reason (R) is wrong.

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11 months ago

Class 12th Physics

27 identical drops are charged at 22V each. They combine to form a bigger drop. The potential of the bigger drop will be…………V.

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alok kumar singh

Contributor-Level 10

Volume of 27 identical drops = volume of a bigger drop

$\Rightarrow 27 * \frac{4}{3} π r^{3} = \frac{4}{3} π R^{3}$

R³ = 27r³

R = 3r

Given potential of a small drop = 22v

$V_{b i g g e r} = \frac{k (27 q)}{R} = \frac{27 k q}{3 r} = 9 \frac{k q}{r} = 9 * 22 = 198 v o l t$

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