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12th notes in hindi

Year: 2022

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Posted onJuly 17, 2022inchemistry

Under isothermal condition , a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is (Given that 1 L bar = 100 J)

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Posted onJuly 17, 2022inchemistry

Which of the following reactions are disproportionation reaction ?

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Posted onJuly 17, 2022inchemistry

4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is

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Posted onJuly 17, 2022inchemistry

The correct structure of tribromooctaoxide is

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Posted onJuly 17, 2022inchemistry

The structure of intermediate A in the following reaction , is

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Posted onJuly 16, 2022inchemistry, chemistry

The number of sigma (σ) and pi (π) bonds in pent-2-en-4-yne is 10σ bonds and 3π bonds

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Posted onJuly 15, 2022inchemistry

Which of the following is an antihistamine drug ? (1) Chlorpheniramine (2) Ciprofloxacin (3) Chloramphenicol (4) Chloroquine

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Posted onJuly 15, 2022inchemistry

The antibiotic used for curing tuberculosis is (1) penicillin. (2) streptomycin. (3) tetracycline. (4) chloromycetin.

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Posted onJuly 15, 2022inchemistry

The drug given during hypertension is (1) streptomycin. (2) chloroxylenol. (3) equanil. (4) aspirin.

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Posted onJuly 15, 2022inchemistry

An antibiotic effective in treatment of pneumonia , bronchitis etc. , is

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