Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Chemistry

 Out of    _{and  , which one is optically active and why ?}

Give one chemical test as an evidence to show that [Co (NH₃)₅Cl]  are ionisation isomers. 

The decomposition of NH₃ on a platinum surface is a zero-order reaction. If the rate constant (k)  is 4 x 10^-3 ms^-1, how long will it take to reduce the initial concentration of NH₃ from 0.1 M to 0.064 M?

Write the structure of main compounds A and B in the following reaction:

\[\ce{CH3CH2CN->[CH3MgBRH/3O+]A->[LiAIH4]B}\]

Why dextro and laevo rotatory isomers of Butan-2-ol are difficult to separate by fractional distillation?

Write the name of gas released when Cu is added to
dilute HNO₃

Write the name of gas released when Cu is added to
conc. HNO₃

Which is true for F-centers?

Which crystal system has axial angles equal to 90°?

Calculate the number of unit cells present in 1 g of gold which has a face-centered cubic lattice.

Which crystal system has a ≠ b ≠ c?

For which of the following reaction the units of rate constant and rate of the reaction are same?

Which process is usually applied for separating gangue from sulphide ores?

Aldehydes react with Grignard reagent to produce ____________.

Ketones react with Grignard reagent to produce ____________.

Primary alcohols are prepared by the reduction of carboxylic acids. Though lithium aluminium hydride is a strong reducing agent, it is not used in the reaction. This is so because:

Aldehydes are reduced to the corresponding alcohols by the addition of hydrogen in the presence of catalysts to form ____________.

Monochlorination of toluene in sunlight followed by hydrolysis by aq. \[\ce{NaOH}\] yields.

Benzaldehyde differs from acetaldehyde in that:

Nitro compounds are reduced by iron scrap and hydrochloric acid to yield one of the following compounds: