Explore topic-wise InterviewSolutions in Current Affairs.

Give plausible
explanation for each of the following:

(i) Cyclohexanone forms cyanohydrin in good yield but 2, 2, 6
trimethylcyclohexanone does not.

(ii) There are two −NH₂ groups in
semicarbazide. However, only one is involved in the formation of
semicarbazones.

(iii) During the preparation of esters from a carboxylic acid
and an alcohol in the presence of an acid catalyst, the water or the
ester should be removed as soon as it is formed.

The major cross aldol product of the following reaction is :

$C{H}_{3}CHO+C{H}_{3}C{H}_{2}CHO\underset{\left(ii\right)△}{\overset{\left(i\right)NaOH}{\to }}$

It takes $0.15mol$ of $Cl{O}^{-}$ to oxidise $12.6g$ of chromium oxide of a specific formula to $C{r}_2{O}_7^{2-}$. $Cl{O}^{-}$ became $C{l}^{-}$. The formula of the oxide is:

(Atomic weight: $Cr=52,O=16$)

On moving across a period, the atomic size decreases and nuclear charge increases and therefore the force of attraction exerted by the nucleus on the electron in the outermost shell increases.
The first ionization potentials (in eV) of As and Se atoms, respectively, are:

An alpha particle of energy $\frac{1}{2}m{v}^2$ bombards a heavy nuclear target of charge $Ze$. Then the distance of closet approach for the alpha nucleus will be proportional to

Is photon only the part of visible light?

Can a quantum of any type of energy be termed as photon?

A sodium salt of an organic acid ‘X’ produces effervescence with conc.$H_{2}S{O}_4$. ‘X’ reacts with the acidified aqueous $CaC{l}_2$ solution to give a white precipitate which decolourises an acidic solution of $KMn{O}_4$. ‘X’ is:

Which of the following is not an entirely ionic compound?

The molecular mass of benzoic acid in benzene, as determined by depression in freezing point method, corresponds to:

The root mean square$\left(rms\right)$ of molecules of nitrogen gas is $v$ at a certain temperature. When the temperature is doubled, the molecules dissociate into individual atoms. The new $rms$ speed of the atom is:

Common question

In the figure shown, the system is a pure substance kept in a piston-cylinder arrangement. The system is initially a two-phase mixture containing $1$ kg of liquid and $0.03$ k of vapour at a pressure of $100$ kPa. Initially, the pistion rests on a set of stops, a shown in the figure. A pressure of $200$ kPa is required to exactly balance the weight of the piston and the outside atmospheric pressure. Heat transfer takes place into the system until its volume increases by $50$%. Heat transfer to the sytem occurs in such a manner that the pistion, when allowed to move, does so in a very slow (quasi-static/quasi-equilibrium) process. The thermal reservior from which heat is transferred to the sytem has a temperature of ${400}^{o}C$. Average temperature of the system boundary can be taken as ${175}^{o}C$. The heat transfer to the system is $1kJ$, during which its entropy increases by $10J/K$. Specific volumes of liquid $v_t$ and vapour $v_g$ phases, as well as values of saturation temperatures, are given in the table below.

In Na₂O oxidation state of oxygen is:

Match the compounds in Column I with their charecteristic test(s)/reaction(s) given in Column II.

Column I	Column II
(A)	(p) Sodium fusion extract of the compound gives prussian blue colour with $FeS{O}_4$
(B)	(q) Gives positive $FeC{l}_3$ test
(C)	(r) Gives white precipitate with $AgN{O}_3$
(D)	(s) Reacts with aldehydes to form hydrazone derivatives

$4g{H}_2,32g{O}_2,14g{N}_2$ and $11gC{O}_2$ are taken in a bulb of 500 ml. which one of these has maximum active mass?

How many binary fluorides does xenon form?

For a reaction,

$P+Q\to R+S.$ The value of $△H^{o}is-30kJmo{l}^{-1}and△Sis-100J{K}^{-1}mo{l}^{-1}.$ At what temperature the reaction will be at equilibrium?

A substance takes $20\text{s}$ for $10\%$ dissociation, if initially $4$ moles of substance was present and it takes $80\text{s}$ for $10\%$ dissociation if initially $2$ moles of substance was present. Then find order of the reaction.

Among the following compounds, the one which can be dehydrated very easily is?

A closed box contains an ideal gas. If temperature of gas increased then

$\left(A\right).$ Mean free path remain same.

$\left(B\right).$ Mean free path decreases.

$\left(C\right).$ Relaxation time decreases.

$\left(D\right).$ Relaxation time remain same.



Which of the following is correct?