Explore topic-wise InterviewSolutions in Current Affairs.

A
‘thermacole’ icebox is a cheap and efficient method for
storing small quantities of cooked food in summer in particular. A
cubical icebox of side 30 cm has a thickness of 5.0 cm. If 4.0 kg of
ice is put in the box, estimate the amount of ice remaining after 6
h. The outside temperature is 45 °C, and co-efficient of thermal
conductivity of thermacole is 0.01 J s^–1
m^–1
K^–1.
[Heat of fusion of water = 335 × 10³
J kg^–1]

Which among the following is most reactive to give nucleophilic addition?

How many moles of oxygen will react with $1$ mole of an aliphatic compound $C_3{H}_8$? The reaction is given as:

$C_3{H}_8+O_2\left(Excess\right)\to C{O}_2+H_{2}O$

Which of the following pairs of d-orbitals have electron density along the axes ?

Which one of the following statements is not true regarding diborane?

$C{H}_{3}C{H}_{2}OH+HCl\stackrel{ZnC{l}_2}{\to }C{H}_{3}C{H}_{2}Cl+H_{2}O$ In the above reaction, the leaving group is ?

Which
acid of each pair shown here would you expect to be stronger?

(i)
CH₃CO₂H
or CH₂FCO₂H

(ii)CH₂FCO₂H
or CH₂ClCO₂H

(iii)
CH₂FCH₂CH₂CO₂H
or CH₃CHFCH₂CO₂H

(iv)

The equilibrium constants are given for the following reaction,
$A{g}^{+}+N{H}_3$ $\leftrightharpoons$ $\left[Ag\right(N{H}_3){]}^{+}$ ; $K_1=3.5\times {10}^{-3}$

$\left[Ag\right(N{H}_3){]}^{+}+N{H}_3$ $\leftrightharpoons$ $\left[Ag\right(N{H}_3{)}_2{]}^{+}$ ; $K_2=1.7\times {10}^{-3}$

then the formation constant of $\left[Ag\right(N{H}_3{)}_2{]}^{+}$ is:

Which of the following solid is isotropic?

Measuring zeta potential is useful in determining a liquid's

The outer electronic configuration of an element (Z = 90) is $5f^{0}6d^{2}7s^2$. It belongs to

The spin angular momentum for the ${}^{\prime }{s}^{\prime }$ electron in $H-atom$ is:

In which of the following structures the pair of starred carbon atom do not lie in the same plane?

A solution of sodium sulphate in water is electrolysed using inert electrodes. The products at the cathode and anode are respectively
(IIT-JEE, 1987)

For a reaction taking place in three steps, the rate constants are k1,k2,k3.The overall rate constant k=k1k2/k3.If the energy of activation values for the first , second and third stages are respectively 40 , 50 , 60 kJ per mole , then the overall energy of activation in kJ / mol is ??please explain the solution

A solid which floats in $H_{2}O$, sinks in $D_{2}O$. Why?

Total number of monochlorinated products (including stereoisomers) during photochemical chlorination of 2-methylbutane is:

[0.77 Mark]