Explore topic-wise InterviewSolutions in Current Affairs.

When $KMn{O}_4$ acts as an oxidizing agent and ultimately forms$Mn{O}_4^{-2}$ ,$Mn{O}_2$ ,$M{n}_2{O}_3$ and$M{n}^{+2}$ , then the number of electrons transferred ( per Mn atom) in each case respectively is:

Among the electrolytes $N{a}_{2}S{O}_4,CaC{l}_2,A{l}_2(S{O}_4{)}_3$ and $N{H}_{4}Cl$, the most effective coagulating agent for $S{b}_2{S}_3$ sol is:

Which of the following is not expected to show paramanganetism ?

Find the number of oxygen atoms in 10 millimnoles of $\left[Fe\right(H_{2}O{)}_{5}NO]S{O}_4$.

In what
ways lithium shows similarities to magnesium in its chemical
behaviour?

The constant '$a$' in van der Waals' equation is maximum in:

Which of the following would be most reactive towards nitration

[AMU 2000; UPSEAT 2002]

The volume of one mole of an ideal gas with the abiabatic exponent $\gamma$ is varied according to the law $V=\frac{a}{T}$, where $a$ is a gas constant. Find the amount of heat obtained by the gas in this process, if the gas temperature is increased by $\Delta T$. $R$ is a gas constant

Which of the following represents the symbol for ''less than or equal to''?

The enthalpy of neutralisation of strong acid by a strong base is $-57.32kJmo{l}^{-1}$. The enthalpy of formation of water is $-285.84kJmo{l}^{-1}$. The enthalpy of formation of hydroxyl ion is :

Which one is most reactive towards $S_{N}1$ reaction?

A living cell contains a solution which is isotonic with $0.3\text{M}$ sugar solution. What osmotic pressure develops when the cell is placed in a $0.1\text{M KCl}$ solution at body temperature?

A positron is emitted from ${}_{11}^{23}Na$. The ratio of the atomic mass and atomic number of the resulting nuclide is:

The ionic radii of $O^{2-},F^{-},N{a}^{+}\text{and}M{g}^{2+}$ are in the order :

An unknown element forms an oxide. What will be the equivalent weight of the element if the oxygen content is $20\%$ by weight?

On addition of one ml solution of
to 10 ml gold sol in the presence

of 0.25 gm of starch, the coagulation is just
prevented. Starch has the

following gold number

[MP PET/PMT 1988]

What
makes a glass different from a solid such as quartz? Under what
conditions could quartz be converted into glass?

The following equilibrium concentrations were measured at $800K:\left[S{O}_2\right]=3.0\times {10}^{-3}M;\left[O_2\right]=3.5\times {10}^{-3}M;\left[S{O}_3\right]=5.0\times {10}^{3}M$ Calculate the equilibrium constant at $800K$ for the chemical reaction in equilibrium for both directions.

$2S{O}_2\left(g\right)+O_2\left(g\right)\rightleftharpoons 2S{O}_3\left(g\right)$

($K_c$ is the equilibrium constant for the forward reaction and $K_c^{{}^{\prime }}$ is the equilibrium constant for the backward reaction)

Write
the equation of the reaction of hydrogen iodide with:

(i)
1-propoxypropane

(ii)
Methoxybenzene and

(iii)
Benzyl ethyl ether

What is the hybridization on carbon (2)?

Vitamin C $(M=176)$ is a compound of $C,H,O$ found in many natural sources, especially citrus fruits. When a $1.0\text{g}$ sample of vitamin C is placed in a combustion chamber and burned, the following data is obtained.

$\text{Mass of}C{O}_2\text{absorber after combustion}=83.85\text{g}$

$\text{Mass of}C{O}_2\text{absorber before combustion}=82.35\text{g}$

$\text{Mass of}{H}_{2}O\text{absorber after combustion}=37.96\text{g}$

$\text{Mass of}{H}_{2}O\text{absorber before combustion}=37.55\text{g}$

What is the empirical formula of Vitamin C?