Class 12th

The IUPAC name of ethylidene chloride is:

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Raj Pandey

Contributor-Level 9

Ethylidene chloride is

1, 1 Dichloro ethane.

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In the colour coding system of carbon resistors, the tolerance (in %) shown by gold band is ____.

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Contributor-Level 10

Gold band is equal to 5% tolerance

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A radioactive sample decays with a constant of (1/3)logₑ2 s⁻¹. If initially there are 200 nuclei present, find the number of nuclei decayed during the first 9 seconds.

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Contributor-Level 10

t? , half life = (log?2)/λ = 3 s
Initially 200 nuclei were there
After 3 half-lives, 9 seconds,
No. of nuclei = (1/2³) (200) = 25
Therefore, the number of nuclei that decayed = 200 – 25 = 175

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Class 12th Electromagnetic Induction

In the following reaction the reason why meta-nitro product also formed is:

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alok kumar singh

Contributor-Level 10

During nitration of aniline, meta product is also formed, it is because of due to presence of anilinium ion. In anilium $- \overset{+}{N} H_{3}$ group is meta directing group.

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9 months ago

Two fixed long parallel horizontal rails, a distance 1 m apart are joined at one end by a resistance 1Ω . A rod AB of negligible resistance slides towards the resistance. A magnetic field of magnitude 4T perpendicular to the plane of rails exists. Find the current flowing (in Ampere) in the resistance, at an instant when the velocity of the rod is 2 m/s.

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Contributor-Level 10

EMF induced = BLV = 4 * 2 * 1 = 8V
Current produced = BLV/R = 8/1 = 8A

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9 months ago

Two capacitros are fully charged by a battery as shown in the figure.

If the capacitors are disconnected from battery and plate 1 is connected to plate 4 & plate 2 to plate 3, then find the potential difference (in volts) across capacitors finally.

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Contributor-Level 10

Charge initially on capacitor 1=10µC
Charge initially on capacitor 2=20µC
Finally the potential difference across both capacitor will be equal.
Let us assume that to be V.
1V + 2V = +10
V = 10 / 3 = 3.33V

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What is the final product (major) 'A' in the given reaction?

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alok kumar singh

Contributor-Level 10

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When monochromatic light of wavelength 620 nm is used to illuminate a metallic surface, the maximum kinetic energy of photoelectrons emitted is 1 eV. Find the maximum kinetic energy of photoelectron emitted (in eV) if a wavelength of 155 nm is used on the same metallic surface. (hc = 1240 eV-nm)

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Contributor-Level 10

In case 1, E? = 2eV; φ? ? = E? - KE? = 1eV
In case 2, E? = 12400/1550 = 8eV; max.KE = 8eV - 1eV = 7eV

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Phenol on reaction with dilute nitric acid, gives two products. Which method will be most efficient for large scale separation?

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Raj Pandey

Contributor-Level 9

Ortho product has intramolecular H- bonding & para product has intermolecular H- bonding. Thus it can be separated by steam distillation due to difference in B.

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