Explore topic-wise InterviewSolutions in Current Affairs.

The reaction of $C_6{H}_{5}CH=CHCHO$ with $LiAl{H}_4$ gives,

For how many of the following ores calcinations is done during extraction of metals?___
(a) Haematite
(b) Calamine
(c) dolomite
(d) bauxite
(e) zinc blende

Molar conductance is used to define as the conducting power of all the ions produced by one mole of the electrolyte in the given solution.
$\Lambda m=\frac{1000\times K}{C}$
Where, K = specific conductance, C = Molar concentration of the solution.
At infinite dilution, each ion makes a definite contribution for the conductance of electrolyte. At infinite dilution, the molar conductance of an electrolyte is the sum of the ionic conductance of constituent ions.
$\Lambda A{B}_m^{\infty }=x{A}_{+}^{\infty }+y{A}_{+}^{\infty }$ where,x and y are the number of cations and anions per formula unit of the electrolyte. By measuring the conductance we can measure degree of dissociation and dissociation constants.
$\alpha =\frac{{\Lambda }^C}{{\Lambda }^{\infty }};K_a=\frac{a^{2}C}{(1-\alpha )};K_b=\frac{{\alpha }^{2}C}{(1-\alpha )}$
By conductance measurements we can calculate the solubility product of a sparingly soluble salt. For a sparingly soluble salt, the saturated solution will be an extremely dilute solution and $A^C$ is taken as $A^{\infty }$. Knowing $A^{\infty }$ (by Kohlrausch’s law) the concentration of saturated solution is calculated from which Ksp is calculated.
The degree of dissociation of water will be
$({\Lambda }_{H^{+}}^0=3.458\times {10}^{-2}S{m}^{2}mo{l}^{-1};{\Lambda }_{O{H}^{-}}^0=1.98\times {10}^{-2}S{m}^{2}mo{l}^{–1};Kaofwater=5.7\times {10}^{-6}S{m}^{-1})$

(a) What is rate of reaction? Write two factors that affect the rate of reaction.

(b) The rate constant of a first order reaction increases from $4\times {10}^{-2}to8\times {10}^{-2}$ when the temperature changes from ${27}^{\circ }C$ to ${37}^{\circ }C$. Calculate the energy of activation $\left(E_a\right)$. (log 2 = 0.301, log 3 = 0.4771, log 4 = 0.6021

What is "R" in the following reaction?

In which of the following reactions diastereomer isomer will formed?

Which of the following compounds gives propyne on treatment with water ?

Question 18

Which of the following metals are obtained by electrolysis of their chlorides in molten state?

(i) $\text{Na}$

(ii) $\text{Ca}$

(iii) $\text{Fe}$

(iv) $\text{Cu}$



(a) (i) and (iv)

(b) (iii) and (iv)

(c) (i) and (iii)

(d) (i) and (ii)

Determine the molecular formula of an oxide of iron in which the mass per cent of iron and oxygen are 69.9 and 30.1 respectively. Given that the molar mass of the oxide is 159.69 g mol^–1.

Value of gas constant, R for one mole of a gas is independent of the

(a) State three features of the nuclear model of an atom put forward by Rutherford.

(b) An atom has atomic number 12, Write the name of the element and its valency.

of a polymer containing 30% molecules with molecular mass 20,000, 40% have 30,000 and the rest have 60,000 is

Which set of quantum numbers is possible for the
last electron of Mg⁺ ion?

Aniline reacts with excess $B{r}_2/H_{2}O$ to give the major product:

Match List I with List II and select the correct answer using the codes given below the lists:-

The intermediate(s) formed during the reaction $C_6{H}_{5}C{H}_{2}COOAg+B{r}_2\stackrel{CC{l}_4}{\to }{C}_6{H}_{5}C{H}_{2}B{r}_2$ is (are)

The experimental data for decomposition of $N_2{O}_5$ $[2N_2{O}_5\to 4N{O}_2+O_2]$ in gas phase at 318 K are given below:

$\begin{array}{cccccccccc}t/s& 0& 400& 800& 1200& 1600& 2000& 2400& 2800& 3200\\ {10}^{-2}\times \left[N_2{O}_5\right]/& 1.63& 1.36& 1.14& 0.93& 0.78& 0.64& 0.53& 0.43& 0.35\\ mol{L}^{-1}& & & & & & & & & \end{array}$

Plot $\left[N_2{O}_5\right]$ against t

$\begin{array}{cccccccccc}t/s& 0& 400& 800& 1200& 1600& 2000& 2400& 2800& 3200\\ {10}^{-2}\times \left[N_2{O}_5\right]/& 1.63& 1.36& 1.14& 0.93& 0.78& 0.64& 0.53& 0.43& 0.35\\ mol{L}^{-1}& & & & & & & & & \end{array}$
Find the half-life period for the reaction

$\begin{array}{cccccccccc}t/s& 0& 400& 800& 1200& 1600& 2000& 2400& 2800& 3200\\ {10}^{-2}\times \left[N_2{O}_5\right]/& 1.63& 1.36& 1.14& 0.93& 0.78& 0.64& 0.53& 0.43& 0.35\\ mol{L}^{-1}& & & & & & & & & \end{array}$
Draw a graph between $log\left[N_2{O}_5\right]$ and t

$\begin{array}{cccccccccc}t/s& 0& 400& 800& 1200& 1600& 2000& 2400& 2800& 3200\\ {10}^{-2}\times \left[N_2{O}_5\right]/& 1.63& 1.36& 1.14& 0.93& 0.78& 0.64& 0.53& 0.43& 0.35\\ mol{L}^{-1}& & & & & & & & & \end{array}$
What is the rate law?

$\begin{array}{cccccccccc}t/s& 0& 400& 800& 1200& 1600& 2000& 2400& 2800& 3200\\ {10}^{-2}\times \left[N_2{O}_5\right]/& 1.63& 1.36& 1.14& 0.93& 0.78& 0.64& 0.53& 0.43& 0.35\\ mol{L}^{-1}& & & & & & & & & \end{array}$
Calculate the rate constant

$\begin{array}{cccccccccc}t/s& 0& 400& 800& 1200& 1600& 2000& 2400& 2800& 3200\\ {10}^{-2}\times \left[N_2{O}_5\right]/& 1.63& 1.36& 1.14& 0.93& 0.78& 0.64& 0.53& 0.43& 0.35\\ mol{L}^{-1}& & & & & & & & & \end{array}$
Calculate the half-life period from k and compare it with (ii)

Which of these are deliquescent salts?

Calculate the pH of $0.05\text{M}$ of $HCl$.

$\left(\text{Use}\log \right[5]=0.7,\log [10]=1)$

The ratio of the radii of the $2^{nd}$ Bohr orbit of hydrogen atom to $3^{rd}$ Bohr orbits of $L{i}^{2+}$ is:

The swimmer is able to cut through water in a swimming pool. Why?

Consider the coordination compound, $N{a}_2\left[Pt\right(CN{)}_4]$. The lewis base is

A sample of 100 ml of 0.10 M acid HA $(K_a=1\times {10}^{-5})$ is titrated with standard 0.10 M KOH.How many ml of KOH will have to be added when the pH in the titration flask will be 5.00 ?

When aq. AgNO₃ is electrolysed using Pt electrodes if 3.2 g of O₂ is liberated at the anode, the amount Ag that will be deposited at the cathode in grams is (at wt. of Ag = 108)