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

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

Complete the following reaction:
\[\ce{(C6H5CH2)2Cd + 2CH3COCI}\]

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 a general electrochemical reaction of the type:

\[\ce{{a}A + {b}B ⇔ {c}C + {d}D}\]

Nernst equation can be written as:

For the first order reaction, half-life is equal to ____________.

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

Zinc carbonate is precipitated from zinc sulphate solution by the addition of ___________.

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:

For producing amines, the reaction of nitro compounds with iron scrap is preferred because:

Quaternary ammonium salt is formed: