Explore topic-wise InterviewSolutions in Current Affairs.

Arrange the following in increasing order of their boiling points.

Identify the end product (C) in the following sequence.

$C_2{H}_{5}OH\underset{\text{Pyridine}}{\overset{SOC{l}_2}{\to }}A\stackrel{\text{(alc.)}KCN}{\to }B\underset{\text{Heat}}{\overset{2H_{2}O/H^{+}}{\to }}C$

[1 Mark]

Heat liberated when 100 ml of 1 N NaOH is neutralized by 300 ml of 1N HCl is

Sort the acids according to their strengths in the decreasing order.

In sucrose, two mono saccharide units are held together by a glycosidic linkage between

During coupling reaction of benzene diazonium chloride and aniline, the pH of reaction medium should be approximately.

In a rock salt crystal and fluorite structure, if atoms along the plane cutting the two opposite edges are removed, then the new ratio of the cations in two respective unit cells and ratio of anions in two respective unit cells are :

if electonegativity is more dipole moment is more or less

Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen?
(IIT-JEE, 2012)

The surface area plays an important role in influencing the rate of reaction in the case of

From: Acetone, Dimethsulfoxide, Dimethylformamide, water, HMPA, Ethanol, Acetic acid, DMA.

The number of polar aprotic solvent in the following solvents is ___.

Which of the following is an amorphous solid?

The Lewis structure of $C{O}_3^{2-}$ ion is:

Arrange the following compounds in order of decreasing trend towards electrophilic substitution reactions:

When $N_2$ goes to $N_2{}^{+}$, the N - N bond distance ... and

when $O_2$ goes to $O_2{}^{+}$, the o - o bond distance....

Bromine
monochloride, BrCl decomposes into bromine and chlorine and reaches
the equilibrium:

for
which K_c=
32 at 500 K. If initially pure BrCl is present at a concentration of
3.3 × 10^–3
molL^–1,
what is its molar concentration in the mixture at equilibrium?

1-butyne on reaction with hot alkaline $KMn{O}_4$ gives:

Finkelstein reaction is used to prepare

[0.77 Mark]

Which enzyme is present in saliva?

Which is the correct expression of van't Hoff factor for dissociation of electrolyte?

Here,

n is the number of ions formed from one formula unit of the substance

Lyophilic colloidal sols are much more stable than lyophobic colloidal sols. This is due to the extensive solvation of lyophilic colloidal sols, which form a protective layer outside it which prevents it from forming associated colloids. Lyophilic colloidal sols also protect lyophobic colloidal sols from precipitation by the action of electrolytes. This is due to the formation of a protective layer by the lyophilic sols outside lyophobic sols. Lyophilic sols are also called protective sols.

Gelatin (lyophilic) protects gold sol (lyophobic) from coagulation on the addition of a solution of sodium chloride. The protective powers of different colloidal sols are measured in terms of gold number.

Gold number is defined as the amount of protective sol in milligrams that prevents the coagulation of 10 mL of a given gold sol on adding 1 mL of a $10\%$ solution of sodium chloride. Thus, the smaller the gold number of a lyophilic sol, the greater is the protective power.



$\left[AgI\right]I^{-}$ colloidal sol can be coagulated by the addition of a suitable cation. 1 mol $\left[AgI\right]I^{-}$ requires $AgN{O}_3,Pb(N{O}_3{)}_2$ & $Fe(N{O}_3{)}_3$ as (in moles):