Explore topic-wise InterviewSolutions in Current Affairs.

When 5g of calcium is burnt in 2g of oxygen then 7g of calcium oxide is produced. What mass of calcium oxide will be produced when 5g of calcium is burnt in 20g of oxygen? Which law of chemical combination will govern your answer?

Assertion (A) Raton is a semisynthetic polymer and is taken as better choice than cotton fabric.

Reason (R) Mechanical and aesthetic properties of cellulose can be improved by Acetylation.

(a) Assertion and Reason both are correct statement But reason does not explain Assertion.

(b) Assertion and Reason both are correct statement and Reason explains the Assertion.

(c) Both assertion and reason are wrong statements.

(d) Assertion is correct statement and Reason is wrong statement.

(e) Assertion is wrong statement and reason is correct statement.

PAN is formed through photochemical reactions between

Which of these is not a monomer for a high molecular mass silicone polymer?

The
concentration of sulphide ion in 0.1M HCl solution saturated with
hydrogen sulphide is 1.0 × 10^–19
M. If 10 mL of this is added to 5 mL of 0.04 M solution of the
following: FeSO₄,
MnCl₂,
ZnCl₂
and CdCl₂.
in which of these solutions precipitation will take place?

Which of the following compound is most likely to follow E1cB mechanism when treated with $C_2{H}_{5}ONa$ in ethanol?

In the iso electronic species the ionic radii ($A^O$) of $N^{3-}$, $O^{-2}$, $F^{-}$ are respectively given by

A
mixture of 1.57 mol of N₂,
1.92 mol of H₂
and 8.13 mol of NH₃
is introduced into a 20 L reaction vessel at 500 K. At this
temperature, the equilibrium constant, K_c
for the reaction

Is
the reaction mixture at equilibrium? If not, what is the direction of
the net reaction?

The radius of hydrogen atom in ground state is $0.53\stackrel{\circ }{A}$. The radius of the first orbit of$L{i}^{2+}$ will be:

Which of the following molecules will show both hyperconjugation and mesomeric effect?

One mole of an ideal gas is carried through a thermodynamic cycle as shown in the figure. The cyclic process consists of an isochoric, an isothermal and an adiabatic process. Find adiabatic exponent of the gas

Write the drawbacks in mendeleef's periodic table that led to its modification.

The solubility of $Mg(OH{)}_2$, in pure water is $9.57\times {10}^{-3}g{L}^{-1}$. Calculate its solubility in $g{L}^{-1}$ in $0.02\text{M}Mg(N{O}_3{)}_2.$

What is the use of radius ratios?

Which of the following cannot give benzoic acid on oxidation with alkaline KMnO₄ followed by acidification

Products of the following reaction

$C{H}_{3}C\equiv CC{H}_{2}C{H}_3\underset{\left(2\right)Hydrolysis}{\overset{\left(1\right)O_3}{\to }}$.....are

A mole of $CC{l}_4$ vapours at ${77}^{\circ }C$ occupies a volume of 36.0 L.If vanderwaals constants are $a=20.39L^{2}atmmo{l}^{-2}$ and $b=0.1383Lmo{l}^{-1}$ calculate the compressibility factor Z under (a) low pressure region and (b) high pressure region.
The values of compressibility factor Za and Zb respectively are:

Which of the following is the correct electronic configuration for oxygen according to Hund's rule?

A polymerisation reaction is carried out at $2000K$ and the same reaction is carried out at $4000K$ with catalyst. The catalyst increase the potential barrier by $20kJ$ but the rate of the reaction remains same. The activation energy of the reaction is

( Assuming all other parameter to be same)

For the cell reaction: $Fe\left(s\right)|F{e}^{2+}\left(0.1\text{M}\right)||H^{+}\left(1\text{M}\right)|H_2\left(1\text{atm}\right)|Pt\left(s\right)$

$E_{\left(Fe/F{e}^{2+}\right)}^0=0.44\text{V},$ the cell emf at $298\text{K}$ is:

Which of the following reduction reactions are actually employed in the commercial extraction of metals?

What will be the $E^0$ value for the given half cell reaction?

$S{n}^{4+}\left(aq\right)+4e^{-}\to Sn\left(s\right)$

Given:

$E^0$ value for the half cell reaction,

$S{n}^{4+}\left(aq\right)+2e^{-}\to S{n}^{2+}\left(aq\right);E^0=0.15V$

$S{n}^{2+}\left(aq\right)+2e^{-}\to Sn\left(s\right);E^0=-0.14V$

A typical compound that undergoes aldol condensation is:

Match the following.



$\begin{array}{cc}\text{List - I}& \text{List - II}\\ \text{(I) Ground state energy of}& \\ H{e}^{+}& \text{(P)}6.04eV\\ \text{(II) Potential energy of I}& \\ \text{orbit of H-atom}& \text{(Q)}-27.2eV\\ \text{(III) Kinetic energy of II}& \\ \text{excited state of}H{e}^{+}& \text{(R)}8.7\times {10}^{-18}J\\ \text{(IV) Ionisation energy of}& \\ \text{H}{e}^{+}\text{in ground state}& \text{(S)}-54.4eV\end{array}$