Explore topic-wise InterviewSolutions in Current Affairs.

What is the solubility of $Al(OH{)}_3$, $(K_{sp}=1\times {10}^{-33})$ in a buffer solution having pH=4?

Which of the following oxyacids of Sulphur have a peroxy –O–O– linkage?

Calculate free energy change for the following reaction at $298K$:
$2NO\left(g\right)+B{r}_2\left(l\right)\to 2NOBr\left(g\right)$
Given the partial pressure of $NO$ is $0.1atm$ and the partial pressure of $NOBr$ is $2.0atm$ and $\Delta G_{fNOBr}^0=82.4kJmo{l}^{-1},\Delta G_{NO}^0=86.55kJmo{l}^{-1}$

Which of the following does not decolourise iodine?

Picric acid is[CPMT 1971, 80, 81; DPMT 1983;MP PMT 1990; BHU 1996]

Which of the following is the correct order of bond angle magnitudes?

The structural formula for Phosphinic acid is:

Show that MPC + MPS = 1.

The stability fo peroxide and superoxide of alkali metals increase as we go down to group. Explain giving reason.

Identify the compound Y in the following reaction.

$s{p}^2$ hybridization is shown by:

For a first order reaction, show that time required for $99\%$ completion is twice the time required for the completion of $90\%$ of reaction.

For the reaction:
$4N{H}_3\left(g\right)+3O_2\left(g\right)\to 2N_2\left(g\right)+6H_{2}O\left(l\right)$
at $298K$. Given that heat of formation of $N{H}_3(g$) and $H_{2}O\left(l\right)$ are $-46kJmo{l}^{-1}$ and $-286kJmo{l}^{-1}$ respectively. Calculate heat of reaction at $298K$.

Which has highest melting point

The charge/ size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, $K^{+},C{a}^{2+},M{g}^{2+},B{e}^{2+}$

The first ionization potential of Na is 5.1 eV. The value of electron gain enthalpy of Na⁺ will be:

Two metallic oxides contain 27.6 % and 30 % oxygen respectively. If the formula of the first oxide is $X_3{O}_4$, what will be the formula of the second oxide?

Mention the factors that affect the rate of a chemical reaction.

Potassium manganate $\left(K_{2}Mn{O}_4\right)$ is formed when:

The atomic weight of Al is 27. When a current of 5 Faradays is passed through a solution of Al⁺³ions, the weight of Al deposited is

Three samples of the same gas A, B and $C(\gamma =\frac{3}{2})$ have initially equal volume. Now the volume of each sample is doubled. The process is adiabatic for A isobaric for B and isothermal for C. If the final pressures are equal for all three samples, the ratio of their initial pressures are

The percentage composition in a sample of $CaC{O}_3$ is given as: $Ca=40\%;C=12\%;O=48\%$. What will be the weight of $Ca$ in $4\text{g}$ of a sample of $CaC{O}_3$ obtained from another source, if the law of constant proportions is true?

If Avogadro's number is A${}_0$, the number of sulphur atoms present in 200 mL of 1N H${}_2$SO${}_4$ is

For an electron in the nth Bohr orbit of hydrogen atom, what will be the ratio of radius of orbit to its de-Broglie wavelength

The molar solubility of $Cd(OH{)}_2$ is $1.84\times {10}^{-5}M$ in water. The expected solubility of $Cd(OH{)}_2$ in a buffer solution of $pH=12$ is:

A solution of Sodium Hydroxide (NaOH) has a pH of 9. What will be the concentration of $O{H}^{-}$ ions?

Explain why pure liquids and solids can be ignored while writing the equilibrium constant expression?

Write the structures of fragments produced on complete hydrolysis of DNA. How are they linked in DNA molecule? Draw a diagram to show pairing of nucleotide bases in double helix of DNA.

For the decomposition of azoisopropane to hexane and nitrogen at 543 K, the following data are obtained. Calculate the rate constant.
$\begin{array}{cc}t\left(s\right)& p\left(mmofHg\right)\\ 0& 35.0\\ 360& 54.0\\ 720& 63.0\end{array}$

Calculate the maximum kinetic energy of photoelectrons emitted when a light of frequency $2\times {10}^{16}Hz$ is irradiated on a metal surface with threshold frequency $\left({\nu }_o\right)$ equal to $8.68\times {10}^{15}Hz$

The following reaction occurs at 500 K. Arrange them in the order of increasing tendency to proceed to completion.
(I) $H_2\left(g\right)+I_2\left(g\right)\rightleftharpoons 2HI\left(g\right);K_c=1.8\times {10}^{-3}$
(II) $N_2{O}_4\rightleftharpoons 2N{O}_2\left(g\right);K_c=3\times {10}^{-3}$
(III) $PC{l}_5\left(g\right)\rightleftharpoons PC{l}_3\left(g\right)+C{l}_2\left(g\right);K_c=1.3\times {10}^{-4}$
(IV) $2S{O}_3\left(g\right)\rightleftharpoons 2S{O}_2\left(g\right)+O_2\left(g\right);K_c=1.3\times {10}^{-5}$

The correct order of boiling points of boron trihalides is:

Pick out the pair of mesomeric forms :

Two moles of helium gas undergoes a cyclic process, shown in figure. Assume the gas is ideal. The corresponding p-V diagram is best represented by

The ratio of Kinetic energy to the total energy of an electron in Bohr orbit is

Which of the following pairs are isostructural?

A dilute solution Contains “x” moles of solute “A” in 1 kg of solvent with molal elevation constant $k_b$. The solute dimerises in the solution according to the following equation. The degree of association is $\alpha$.
$2A\rightleftharpoons A_2$
The von't Hoff factor will be