A white crystalline salt A reacts with dilute \(\mathrm{HCl}\) to liberate a suffocating gas B and also forms a yellow precipitate. The gas B turns potassium dichromate acidified with dilute \(\mathrm{H}_{2} \mathrm{SO}_{4}\) to a green coloured solution C. A, B and C are respectively

Oxidation state of copper is \( +1 \) in

Extraction of chlorine from brine solution is based on

In the following sequence of reactions

The final product \( C \) is

Lower members of aliphatic carboxylic acidare soluble in water. This is due to

Match List-I with List-II for the following reaction pattern
Glucose \(\xrightarrow{\text { Reagent }}\) Product \(\longrightarrow\) Structural prediction
\begin{array}{|l|l|l|l|}\hline & \text{List - I (Reagents)} & & \text{List-II (Structural prediction)} \\\hline \text{a}. & \text{Acetic anhydride} & \text{(i)} & \text{Glucose has an aldehyde group} \\\hline \text{b.} & \text{Bromine water} & \text{(ii)} & \text{Glucose has a straight chain of six carbon atoms} \\\hline \text{c.} & \text{Hydroiodic acid} & \text{(iii)} & \text{Glucose has five hydroxyl group} \\\hline \text{d.} & \text{Hydrogen cyanide} & \text{(iv)} & \text{Glucose has a carbonyl group} \\\hline\end{array}

Choose the correct answer from the options given below.

How many ions per molecule are produced in the solution when Mohr salt is dissolved in
excess of water?

Two thin biconvex lenses have focal lengths \(f_{1}\) and \(f_{2}\). A third thin biconcave lens has focal length of \(f_{3}\). If the two biconvex lenses are in contact, then the total power of the lenses is \(P_{1}\). If the first convex lens is in contact with the third lens, then the total power is \(P_{2}\). If the second lens is in contact with the third lens, the total power is \(P_{3}\), then

When compared to \(\Delta \mathrm{G}^{\circ}\) for the formation of \(\mathrm{Al}_{2} \mathrm{O}_{3}\), the \(\Delta \mathrm{G}^{\circ}\) for the formation of \(\mathrm{Cr}_{2} \mathrm{O}_{3}\) is

Dalton's law of partial pressure is applicable to which one of the following systems?

The best method for the conversion of an alcohol into an alkyl chloride is by treating the alcohol with

Helium is used in balloons in place of hydrogen because it is

The two vector \(\hat{\mathbf{i}}+\hat{\mathbf{j}}+\hat{\mathbf{k}}\) and \(\hat{\mathbf{i}}+3 \hat{\mathbf{j}}+5 \hat{\mathbf{k}}\) represent the two sides \(\overline{A B}\) and \(\overline{A C}\) respectively of a \(\triangle A B C\). The length of the median through \(A\) is