Explore topic-wise InterviewSolutions in Current Affairs.

Relative lowering of vapour pressure of a dilute aqueous solution of glucose is found to be $0.018$. Hence, elevation in boiling point is:
(Given, that $1$ molal aqueous urea solution boils at $00.54{}^{o}C$ at $1$ atm pressure)

The average energy intensity contribution of electric field in an EM wave is $I.$ The net average energy intensity of EM wave is

The magnitude of the change in oxidising power of the $Mn{O}_4^{-}/M{n}^{2+}$ couple is $x\times {10}^{-4}V$, if the $H^{+}$ concentration is decreased from $1M$ to ${10}^{-4}M$ at $25°C$. (Assume concentration of $Mn{O}_4^{-}$ and $M{n}^{2+}$ to be same on change in $H^{+}$ concentration). The value of $x$ is . (Round off to the nearest integer).

[Given: $2.30RT/F=0.059$]

Borax is actually made of two tetrahedra and two triangular units joined together and should be written as: Na2[B4O5(OH)4]·8H2O

The correct statement/s about borax is/are:

a. Each boron atom has four B-O bonds

b. Each boron atom has three B-O bonds

c. Two boron atoms have four B-O bonds while other two have three B-O bonds

d. Each boron atom has one -OH groups

Which of the following is the schmidt rearrangement reaction?

The ground state electronic configuration of the elements $U,V,W,X$ and $Y$ (these symbols do not have any chemical significance) are as follows:

$U1s^{2}2s^{2}2p^{3}V1s^{2}2s^{2}2p^{6}3s^{1}W1s^{2}2s^2{p}^{6}3s^{2}3p^{2}X1s^{2}2s^2{p}^{6}3s^{2}3p^{6}3d^{5}4s^{2}Y1s^{2}2s^2{p}^{6}3s^{2}3p^{6}3d^{1}04s^{2}4p^6$

Determine which sequence of elements satisfy the following statements:

(i)Element forms a carbonate which is not decomposed by heating

(ii)Element is most likely to form coloured ionic compounds

(iii)Element has largest atomic radius

(iv)Element forms only acidic oxide

Calculate the volume occupied by $8.8\text{g}$ of $C{O}_2$ at ${31.1}^{\circ }C$ and $1\text{bar}$ pressure. (Given, $R=0.083{\text{bar L K}}^{-1}{\text{mol}}^{-1}$)

Which of the following compound will follow $S_{N}2$ meachanism most easily?

Which of the following has the smallest atomic radii?

To a solution of a colourless efflorescent sodium salt, when dilute acid is added, a colourless gas is evolved along with formation of a white precipitate. Acidified dichromate solution turns green when the colourless gas is passed through it. The sodium salt is

At room temperature, the degrees of freedom of Oxygen gas molecule is:

Which of the following is incorrect order of $X-P-X$ bond angle?

For the same peak pressure and work output

A solution containing $0.5216g$ of non-volatile solute 'A' (molar wt. = $128.16gmo{l}^{-1}$) in $50mL$ of $CC{l}_4$ shows boiling-point elevation of ${0.402}^{o}C$ while a solution of $0.6216g$ of an unknown solute in the same weight of solvent gave a boiling-point elevation of ${0.647}^{o}C.$ Find the molecular mass of the unknown solute.

Which of the following pair of compounds does not represent structural isomerism?

The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha-carbon, is

Consider the following reaction scheme.

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



Find (A) along with byproducts.

[1 Mark]

Definition for colloidion

Which element do you think would have been named by
(i) Lawrence Berkeley Laboratory

(ii) Seaborg’s group?

In a compound, oxides ions form fcc lattice, whereas $\frac{1}{4}th$ of tetrahedral voids are occupied by cations $A^{2+}$ and $\frac{1}{8}th$ of octahedral voids are occupied by cations $B^{3+}$ ions. The simplest formula of the compound is

The compound(s) with TWO lone pairs of electrons on the central atom is/are:

The following data has been given for solubility of $C{O}_2$ in $H_{2}O$



$$\begin{array}{ccc}\text{Temperature}& \text{Henry's constant}& \text{Pressure}\\ 273K& 600atm& 0.03atm\\ 333K& 3400atm& p_2\end{array}$$



If solution of $C{O}_2$ in $H_{2}O$ is heated from $273$ to $333K$, pressure $\left(P_2\right)$ need to keep $C{O}_2$ in the solution is

Reaction of 2-butane with acidic KMnO${}_4$ gives

Dinucleotide is obtained by joining two nucleotides together by phosphodiester linkage. Between which carbon of pentose sugar of nucleotides are these linkages present?