Explore topic-wise InterviewSolutions in Current Affairs.

A species having a carbon atom possessing a sextet of electrons and a positive charge is called as:

Match the polymers in column-A with their main uses in column-B and choose the correct answer:

$\begin{array}{cc}\text{Column-A}& \text{Column-B}\\ \text{(A) Polystyrene}& \text{(i) Paints and lacquers}\\ \text{(B) Glyptal}& \text{(ii) Rain coats}\\ \text{(C) Polyvinyl chloride}& \text{(iii) Manufacture of toys}\\ \text{(D) Bakelite}& \text{(iv) Computer discs}\end{array}$

(IIT-JEE-2015(M))

What is the IUPAC name of this compound?

In the given circuit the maximum deflection in the galvanometer occurs when

Among the equations given below, $\Delta H$ of which one is equal to $I{E}_1$ of $Ba$?

The hybridization state of Carbon in fullerene is:

Which one of the following is the major product of the given reaction?

Zirconium or Titanium is refined by which process

What are A, B, C in the following reaction?

I. $(C{H}_{3}COO{)}_{2}Ca\stackrel{△}{\to }$ A II. $C{H}_{3}C{O}_{2}H\underset{RedP}{\overset{HI}{\to }}$ B III. $2C{H}_{3}C{O}_{2}H\stackrel{P_4{O}_{10}}{\to }$ C

Which of the following compounds has been incorrectly matched?

Electrical energy produced by a reversible electrochemical cell is given by the free energy decrease $(–\Delta G)$ of the reaction occurring in the cell. According to Gibbs- Helmholtz equation, decrease in free energy is given by $–\Delta G=–\Delta H–T{\left[\frac{\delta \left(\Delta G\right)}{\delta T}\right]}_P$ where $–\Delta H$ is the decrease in enthalpy of the cell reaction at constant pressure. EMF of the cell, $E=\frac{-\Delta H}{nF}+T{\left[\frac{\delta E}{\delta T}\right]}_P$. By measuring the emf of the cell and its temperature co-efficient, thermodynamic quantities like $\Delta H,\Delta G$ and $\Delta S$ can be determined. Standard emf of the cell is related to equilibrium constant of the cell reaction as $E^0=\frac{2.303RTlogk}{nF}$.

EMF of the cell, $\begin{array}{ccccc}A& A^{2+}& & B^{+}& B\\ \left(S\right)& \left(aq\right)& & \left(aq\right)& \left(s\right)\\ & 1M& & 0.1M& \end{array}$ is found to be 1.475 Volt. The equilibrium constant of the cell reaction at ${25}^{\circ }$ C is (approximately)

Molecular wt of mohr’s salt is 392. Its equivalent weight, when it is oxidized by $KMn{O}_4$ in acidic medium is

Find the dissociation constant $K_a$ of a weak monobasic acid which is 3.5% dissociated in a $\frac{M}{10}$ solution at ${25}^{\circ }C$

The average speed of a snail is 0.020 miles/ hour and that of a leopard is 70 miles/ hour. Convert these speeds in SI units.

Consider the cyclic process $abca$ performed on a sample of $2$ mole of an ideal gas. A total of $1000cal$ of heat is withdrawn from the sample in the process. Find the work done by gas during the part $bc$. (Assume $ab$ to be isobaric process and take $R=2cal{/}^{\circ }C/mol$)

For an FCC structure and a BCC structure having equal edge length ‘a’ and equal radius for anion, then the difference between cationic radius of BCC and FCC lattice is

Phenol reacts with methyl chloroformate in the presence of $NaOH$ to form product A. A reacts with $B{r}_2$ to form product B. A and B respectively are:

The electron in hydrogen atom makes a transition from $n=n_1\text{to}n=n_2$ state. The time period of the electron in the initial state is eight times that in the final state. The possible values are

The density d of nuclear matter varies with nucleon number A as

Which of the following is an electrophillic reagent?

Total no. of halogens present in one molecule of organic product formed___

Which of the following reaction does not occur?

Calculate $\left[O{H}^{-}\right]$ of 0.01 M ammonium hydroxide solution. The ionization constant for $N{H}_{4}OH$ is $1.8\times {10}^{-5}M$.

If a plasmid vector is digested with EcoR I, then

Dual behavior of matter proposed by de Broglie led to the discovery of electron microscope often used for the highly magnified images of biological molecules and other type of material. If the velocity of the electron in this microscope is 1.6 × ${10}^{6}m{s}^{–1}$, calculate de Broglie wavelength associated with this electron.

The bond order is maximum in

[AIIMS 1983, 85; CBSE PMT 1994; MP PET 2002]

In the formation of adduct from ammonia and boron trifluoride.

If $C_v=4.96cal/mol.K$ then increase in internal energy when temperature of 2 moles of this gas is increased from $340K$ to $342K$

According to Einstein's photoelectric equation, the graph between the kinetic energy of the photoelectrons ejected and the frequency of the incident radiation is:

The oxidation state of oxygen in Hydrogen peroxide is

The ratio of the maximum to the minimum wavelengths of an electron that emits radiation is 1.8. What energy level (n) will its first excited state be at?

The formation of the oxide ion, $O_{\left(g\right)}^{2-}$ from oxygen atom requires first an exothermic and then an endothermic step as shown below:
$O_{\left(g\right)}+e^{-}\to O_{\left(g\right)}^{-};{\Delta }_f{H}^{\circ }=-141kJmo{l}^{-1}{O}_{\left(g\right)}^{-}+e^{-}\to O_{\left(g\right)}^{2-};{\Delta }_f{H}^{\circ }=+780kJmo{l}^{-1}$
Thus, process of formation of $O^{2-}$ in gas phase is unfavourable even though $O^{2-}$ is isoelectronic with neon. It is due to the fact that,

The degree of dissociation of I₂ molecule at 1000⁰C and under atmospheric pressure is 40% by volume. The total pressure on the gas at equilibrium so that the dissociation is reduced to 20% at the same temperature, will be

Which of the following conditions favours the existence of a substance the solid state ?

(a) Hight temperature (b) Low temperature

(c) High thermal energy (d) Weak cohesive forces

Choose the pair of chain isomer:

Oxygen atom in ether is

What will be the oxidation number of underlined element : $KAl(\underset{–}{S}{O}_4{)}_2.12H_{2}O$