Explore topic-wise InterviewSolutions in Current Affairs.

If 'I' is the intensity of absorbed light and 'c' is the concentration of AB for the photochemical process AB + hvà AB*, the rate of formation of AB* is directly proportional to:

Consider the following gaseous equilibria with equilibrium constants $K_1$ and $K_2$ respectively.
$S{O}_2\left(g\right)+\frac{1}{2}{O}_2\left(g\right)\rightleftharpoons S{O}_3\left(g\right)2S{O}_3\left(g\right)\rightleftharpoons 2S{O}_2\left(g\right)+O_2\left(g\right)$
The equilibrium constants are related as :

A dye emits $50\%$ of the absorbed energy as fluorescence. If the number of quanta absorbed and the emitted out are in ratio $1:4$. Find the wavelength of emitted radiation if the absorbed radiation has a wavelength of $x\stackrel{o}{\text{A}}$.

Which of the following can be called as a conjugate acid - base pair?

The $xz$ plane separates two media $A$ and $B$ with refractive indices ${\mu }_1$ and ${\mu }_2$ respectively. A ray of light travels from $A$ to $B$. Its directions in the two media are given by the unit vectors, $\overrightarrow{r_A}=a\hat{i}+b\hat{j}$ & $\overrightarrow{r_B}=\alpha \hat{i}+\beta \hat{j}$ respectively where $\hat{i}$ & $\hat{j}$ are unit vectors in the $x$ & $y$ directions. Then:

(correct answer + 2, wrong answer - 0.50)

A $0.60g$ sample consisting of only $Ca{C}_2{O}_4$ and $Mg{C}_2{O}_4$ is heated at $500{}^{o}C,$ converting the two salts of $CaC{O}_3$ and $MgC{O}_3.$ The sample then weighs $0.465g$. If the sample had been heated to $900{}^{o}C$ and the products are $CaO$ and $MgO$, what would the mixtures of oxides have weighed?

Pick out the wrong statement

Calculate the number of photons emitted per second by a $10\text{W}$ sodium vapour lamp. Assume that $60\%$ of the consumed energy is converted into light. Wavelength of sodium light is $662\text{nm}$.
(Given that $h=6.62\times {10}^{-34}\text{J s}$)

Arrange the following steps according to the adsorption theory

Selenious acid $\left(H_{2}Se{O}_3\right),$ a diprotic acid has $K_{a1}=3.0\times {10}^{-3}$ and $K_{a2}=5.0\times {10}^{-8}.$ What is the $\left[O{H}^{-}\right]$ of a $0.30M$ solution of a selenious acid?

Which of the following are properties of an amorphous solid?

The average velocity of a gas is $400m{s}^{-1}$.Find the rms velocity of the gas.

Different forms of silica such as quartz, tridymite and cristobalite are as follows:
Quartz $\stackrel{{870}^{\circ }C}{⟶}$ Tridymite $\stackrel{{1470}^{\circ }C}{\rightleftharpoons }$ Cristobalite

$\left(Si{O}_2\right)$ $\left(Si{O}_2\right)$ $\left(Si{O}_2\right)$

The structure possessed in them is:

What is the order of resistance in the following materials?

Explain the following with an example.
Kolbe's reaction

Reimer-Tiemann reaction

Williamson ether synthesis

Unsymmetrical ether

$A+2H_{2}O\overrightarrow{-2HCl}HO-\stackrel{R}{\stackrel{|}{\underset{R}{\underset{|}{Si}}}}-OH$

$HO-\stackrel{R}{\stackrel{|}{\underset{R}{\underset{|}{Si}}}}-OH+HO-\stackrel{R}{\stackrel{|}{\underset{R}{\underset{|}{Si}}}}-OH\to B$

Identify A and B

Which of the following processes involves absorption of energy?

Unidentate ligands with more than one co-ordinating atoms are called as

What is the order of acidic strength in O- Fluoro Phenol, m-Fluoro Phenol and p-Fluoro Phenol ? Please specify whether Ortho effect is considered in o-Fluoro phenol or not.

Which of the reaction defines $\Delta H_f^0$ ?

Lead is formed from its ore by the following reactions: $2PbS\left(s\right)+3O_2\left(g\right)\to 2PbO\left(s\right)+2S{O}_2\left(g\right)\text{(Yield = 40 \%)}$
$PbO\left(s\right)+C\left(s\right)\to Pb\left(s\right)+CO\left(g\right)\text{(Yield = 80 \%)}$
If $550\text{kg}$ of $PbS$ was initially taken, find the amount of $Pb$ in kg formed.
(Molar mass of $Pb=207\text{g/mol}$)

The amount of workdone in an adiabatic expansion from temperature T to $T_1$ is

The value of $\Delta H-\Delta U$ for the following reaction at ${27}^{\circ }$ will be : $2N{H}_{3\left(g\right)}\to N_{2\left(g\right)}+3H_{2\left(g\right)}$

Explain effective nuclear charge

Compound A on sulphonation with oleum forms benzene sulphonic acid, which on heating with NaOH and acidification yields phenol. What is Compound A?

What is the hybridization of P in $PC{l}_5\left(\text{s}\right)$ ?

Which equation do not represent enthalpy change of reaction which correspond to the standard enthalpy change of atomisation of chlorine?

Sort the following on the basis of reactivity toward nucleophilic addition reaction.

Match the coordination compounds given in Column I with the central metal atoms given in Column II and assign the correct code.

$\begin{array}{cc}\text{Column~I}& \text{Column~II}\\ \left(Coordinationcompound\right)& \left(Centralmetalatom\right)\\ A.Chlorophyll& 1.Rhodium\\ B.Bloodpigment& 2.Cobalt\\ C.Wilkinsoncatalyst& 3.Magnesium\\ D.Vitamin{B}_{12}& 4.Iron\end{array}$

Codes

$\begin{array}{ccccc}& A& B& C& D\\ \left(a\right)& 3& 4& 1& 2\\ \left(b\right)& 3& 4& 5& 1\\ \left(c\right)& 4& 3& 2& 1\\ \left(d\right)& 3& 4& 1& 2\end{array}$

According to Le-Chatelier's principle, adding heat to a solid to liquid in equilibrium will causes the -

Assertion : Mass or bulk flow is the movement of substance en masse from one point to another, as a result of pressure difference between the two points.

Reason: It can be achieved only through positive hydrostatic pressure.

M of HCl is 0.1,find volume of HCl required to completely react with 1g mixture of Na_{​​​​​2}​​​​CO_​​3 and NaHCO_​​3 containing equimolars amount of the two

All elements in 3rd period have

Which of the following gas has $\gamma$-value equal to 1.4?

What do we mean by radius ratio?

Which of the following when reacted with acetamide would give methylamine:

Write the cell reaction of the following cell

Pt, H2/H+(C1M)(aq) || H2(C2M)(aq)/H2(g) , Pt

H2SO2O7[i]+h2o(1)gives h2so4(1) balance the equation step wise