Explore topic-wise InterviewSolutions in Current Affairs.

2 mole of an ideal gas at ${27}^{\circ }C$ expands iso - thermally and reversibly from a volume of 4 litre to 40 litre. The work done(in kJ)by the gas is:

An empty container was filled with equal masses of methane and hydrogen gases. The fraction of total pressure exerted by hydrogen is____.

What will be the major product of the following reaction?

The best coagulant for the precipitation of $Fe(OH{)}_3$ sol is:

If P > ${\Delta }_0$, then $d^4$ is represented is

What is 'X' in the following reaction?

Which among the following is the correct decreasing order of covalent character?

The vapour pressure of pure benzene at ${88}^{\circ }C$ is 600 mm Hg and that of toluene at the same temperature is 1240 mm Hg. Calculate the composition of a benzene-toluene mixture boiling at ${88}^{\circ }C$.

Chlorine atom differs from chloride ion in the number of

The mass of $BaC{O}_3$ produced when excess of $C{O}_2$ is bubbled through a solution of $0.205\text{mole}Ba(OH{)}_2$ solution, is:
(Take molar mass of $Ba=137\text{g/mol}$)

$Ba(OH{)}_2+C{O}_2\to BaC{O}_3+H_{2}O$

The molecules having the same hybridization and number of lone pairs of electrons is:

Which of the following halides is least stable and has a doubtful existence?

Which one of the following reactions is most suitable for the preparation of n-propyl benzene

Calculate the RMS velocity of Ozone kept in a closed vessel at ${20}^{\circ }$ C and 82 cm Hg pressure.

Match items of Column I with the items of Column II and assign the correct code :

$\begin{array}{cccc}& \text{Column - I}& & \text{Column - II}\\ \left(a\right)& \text{Cyanide process}& \left(i\right)& \text{Ultrapure Ge}\\ \left(b\right)& \text{Froth floatation}& \left(ii\right)& \text{Dressing of ZnS}\\ \left(c\right)& \text{Electrolytic}& \left(iii\right)& \text{Extraction of Al}\\ \left(d\right)& \text{Zone refining}& \left(iv\right)& \text{Extraction of Au}\\ & & \left(v\right)& \text{Purification of Ni}\end{array}$

The two electrons have the following set of quantum numbers:

$P=3,2,-2,+\frac{1}{2}$ $Q=3,0,0,+\frac{1}{2}$

Which of the following statement is true?

A nucleotide consists of

$H_{2}SandS{O}_2$ can be distinguished by

When phosphorous trihalide is reacted with a suitable alcohol to form haloalkane, the side product of reaction is

[Pb. CET 2004]

Several blocks of Mg are fixed to the bottom of a ship to:

Decreasing order of reactivity of alkyl halide is:

4-methyl benzene sulphonic acid reacts with sodium acetate to give:

In Which of the following pairs, molecules have bond order three and are isoelectronic?

Which one of the following statements about water is FALSE ?

The work function of metal is $4\text{eV}$. To emit a photo electron of zero velocity from the surface of metal, the wavelength of incident light should be:

Give the IUPAC names of the following compounds :

$C{H}_{3}CH\left(Cl\right)CH\left(Br\right)C{H}_3$

$CH{F}_{2}CBrCIF$

$ClC{H}_{2}C\equiv CC{H}_{2}Br$

$(CC{l}_3{)}_{3}CCl$

$\left(C{H}_{3}C\right(p-Cl{C}_6{H}_4{)}_{2}CH\left(Br\right)c{h}_3)$

Which one of the following pairs of solution is not an acidic buffer ?

QUESTION 2.13

The partial pressure of ethane over a solution containing $6.56\times {10}^{-3}g$ of ethane is 1 bar. If the solution contains $5.00\times {10}^{-2}g$ of ethane, then what shall he the partial pressure of gas?

Molecules whose mirror image is non-superimposable over them are known as chiral. Which of the following molecules is chiral in nature?

(a) 2-bromobutane (b) 1-bromobutane

(3) 2-bromoprapane (d) 2-bromoprapane-2-ol

A white crystalline solid “X” gives following chemical tests:
(i) it liberates $C{O}_2$ with $NaHC{O}_3$
(ii) It forms a coloured dye on diazotisation and coupling with $\beta$ - napthol
(iii) With $B{r}_2$ water if forms white ppt of 2, 4, 6 - tribromo aniline. Then "X'' can be:

Which of the following will have highest melting point?

The pH of a 0.001M $NaOH$ will be

A tetrapepetide has – COOH on Alanine. This produces glycine(Gly), Valine(Val), Phenyl alanine(Phe) and Alanine(Ala, on complete hydrolysis. For this tetrapeptide, the number of possible sequences (primary sturctures) with – $N{H}_2$ group attached to a chiral centre is ___

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):

$H_{3}P{O}_4+H_{2}O\rightleftharpoons H_3{O}^{+}+H_{2}P{O}_4^{-}$ $p{K}_1=2.15$

$H_{2}P{O}_4^{-}+H_{2}O\rightleftharpoons H_3{O}^{+}+HP{O}_4^2-$ $p{K}_2=7.20$

Hence pH of 0.01 M $Na{H}_{2}P{O}_4$ is:

In which of the following hydrogen bond is present