Explore topic-wise InterviewSolutions in .

For silver metal, the threshold frequency $\left({\nu }_0\right)$ is $1.12\times {10}^{17}\text{Hz}$. What is the maximum kinetic energy of the photoelectrons produced by shining UV light of wavelength $15\stackrel{\circ }{A}$ on the metal?

A 0.001 molal solution of in water had a freezing point depression of 0.0054°C. If K_f for water is 1.80, the correct formulation for the above molecule is

For a van der Waal's gas $V_c=3b,P_c=\frac{a}{27b^2}$

$T_c=\frac{8_a}{27bR}$. Numerically the compressibility factor of a van der Waals gas at the critical points is:

Choose the best reaction sequence that could be used to perform the following transformation.

A $821\text{mL}{N}_2\left(g\right)$ was collected over liquid water at $300\text{K}$ and 1 atm. If the vapour pressure of $H_{2}O$ is 30 torr then number of moles of $N_2\left(g\right)$ in the moist gas mixture is:

A photon of $400\text{nm}$ is absorbed by a gas molecule and then the molecule re-emits two photons. One re-emitted photon has wavelength $500\text{nm}$. Assuming that there is no change in the energy of molecules, the wavelength of second re-emitted photon is:

The root mean square velocity of one mole of a monatomic gas having molar mass M is $u_{rms}$. The relation between the average kinetic energy $E$ per mole of the gas and $u_{rms}$ is.

Which of the following is not a resonating structure of each other?

Starch paper is used to test for the presence of

Match List-I with List-II.

$$\begin{array}{cccc}& \text{List-I}& & \text{List-II}\\ \left(P\right)& Fe\left(N{O}_3{)}_3\right(aq)& \left(1\right)& \text{Only cationic hydrolysis}\\ \left(Q\right)& KCl{O}_4\left(aq\right)& \left(2\right)& \text{Only anionic hydrolysis}\\ \left(R\right)& RCOONa\left(aq\right)& \left(3\right)& \text{Both cationic as anionic hydrolysis}\\ \left(S\right)& N{H}_{4}CN\left(aq\right)& \left(4\right)& \text{No hydrolysis}\end{array}$$

Pure water freezes at $273\text{K}$ and $1\text{bar}$. The addition of $34.5\text{g}$ of ethanol to $500\text{g}$ of water changes the freezing point of the solution. Use the freezing point depression constant of water as $2{\text{K kg mol}}^{-1}$. The figures shown below represent plots of vapour pressure (V.P.) versus temperature $\text{(T)}$. (Molecular weight of ethanol is $46{\text{g mol}}^{-1}$). Among the following, the option representing change in the freezing point is:

Which of the following is true for an adiabatic process?

Benzaldehyde differs from acetaldehyde in this respect that the former does not react with

What is the decreasing order of strengths of the following bases?

$\stackrel{\ominus }{OH},N{H}_2^{\ominus },H-C\equiv C^{\ominus },andC{H}_3-C{H}_2^{\ominus }$

Number of orbitals represented by $n=3,l=2$ and $m=+2$ is:

A and B will be:

A compound possesses $8\%$ sulphur by mass. The least molecular mass is

Biphenyl is obtained by treating chlorobenzene with Na metal in presence of ether, the reaction is called as :

Sodium carbonate is manufactured by the:

In the species

i) 4.0g of $NaOH$ ii) 4.8g of $S{O}_2$

iii) 4.0 g of $C{O}_2$ iv) 2.8 g of $CaO$,

decreasing order of the weight of oxygen is

An aqueous solution of glucose was prepared by dissolving 18g in 90g of water. The relative lowering of vapour pressure is

If a mixture of $C{O}_{2}and{N}_2$ in equal amount exert a total pressure of 1 atm, the partial pressure of $N_2$ in the mixture is –

Identify the correctly balanced redox reaction using ion-electron method.

$FeS{O}_4+KMn{O}_4+H_{2}S{O}_4\to F{e}_2(S{O}_4{)}_3+MnS{O}_4+H_{2}O+K_{2}S{O}_4$

Sort the following on the basis of reactivity toward nucleophilic addition reaction.

When a certain metal was irradiated with light of frequency $4.0\times {10}^{16}{s}^{-1}$, the photoelectrons emitted had three times the kinetic energy as the kinetic energy of photoelectrons emitted when the metal was irradicated with light of frequency $2.0\times {10}^{16}{s}^{-1}$. Calculate the critical frequency (${\nu }_0$) of the metal.

In a compound, oxide ions constitute cubic close packing. Cations A occupy 50% of tetrahedral holes while cations B occupy all the octahedral voids. The empirical formula of the compound is ?

If two isomers have been classified correctly as anomers, they may also be called

What is the major product of the following reaction? $H_{2}C=CH-C{H}_{2}OH\stackrel{HBr\left(excess\right)}{\to }Product$

Find total pressure observed after opening the stopcock . [neglecting the volume of the tube connecting the two bulbs]

Among Boron family, the element that forms an amphoteric oxide and amphoteric hydroxide is:

The total number of stereoisomers that can exist for M is

The process of obtaining sulphur by the borehole method is called the:

See the figure

The valves of X and Y are opened simultaneously.

The white fumes of $N{H}_{4}Cl$ will first form close to which of A, B and C?

Lyophilic sols are more stable than lyophobic sols because

Mark the neutral oxide among the following.

The density of water is $1gm/ml$. The number of molecules present in $1litre$ of water $is$

Given the value of Rydberg Constant is ${10}^{-7}{m}^{-1}$, the wave number of last line of the Balmer series in hydrogen spectrum will be:

Mole fraction of vapours of A above the solution in a mixture of A and B (X_A=0.4 ) is:

Van't Hoff factor i can be best described as:

The root mean square velocity of hydrogen is $\sqrt{5}$ times than that of nitrogen. If $T$ is the temperature of the gas, then:

The reaction is faster when X is :

The ratio of the value of any colligative property for KCl solution to that for sugar solution is nearly:

Which of the following aqueous solutions, containing 10 gm of solute in each case, has highest boiling point?

The percentage degree of dissociation of water at ${25}^{o}C$ is $1.9\times {10}^{-7}$ and density is 1.0 g $c{m}^{-3}$ The ionic constant for water is:

Incorrect order of basic strength of amines in aqueous state

$S_{N}1$ solvolysis of 1-(bromomethyl)cyclohex-1-ene in ethanol gives:

Which of the following will give the fastest nucleophilic substitution reaction by $S_{N}2$ pathway ?

2 mol of $PC{l}_5$ were heated to ${327}^{o}C$ in a closed 2 L vessel and when equilibrium was achieved, $PC{l}_5$ was found to be 40% dissociated into $PC{l}_3$ and $C{l}_2.$ Calculate the equilibrium constant $\left(K_C\right)$ for the reaction