Explore topic-wise InterviewSolutions in Current Affairs.

The correct order of atomic radii for the following species $S,P,Se$ and $Cl$ is:

When a certain metal was irradiated with light of frequency $1.6\times {10}^{16}Hz$, the photoelectrons emitted had twice the kinetic energy as the photoelectrons emitted when the same metal was irradiated with light of frequency $1.0\times {10}^{16}Hz$. Calculate the threshold frequency ($v_0$) for the metal.

The major product formed when excess of $HCl$ reacts with 2-Butyne?

The chlorobenzene is generally obtained from a corresponding diazonium salt by reacting it with

Which of the following reaction is correct for a given electrochemical cell at ${25}^{\circ }C$ ?

$Pt\left(s\right)|B{r}^{-}\left(aq\right)|B{r}_2\left(g\right)||C{l}_2\left(g\right)|C{l}^{-}\left(aq\right)|Pt\left(s\right)$

The plot depicts the behaviour of the mean free time $\tau$ (time between two successive collisions) for the molecules of an ideal gas, as a function of temperature $\left(T\right)$, qualitatively, is: (Graphs are schematic and not found to scale)

Which of the following heterocyclic compounds would have aromatic character?

42. A colourless gas G, produced on with common salt is introduced into one end of a glass tube. Through the other end, another pungent smelling colourless gas, $G_2$ of molecular mass 17 is introduced. A white sublimate, S is produced inside the tube. Which of the following statements is wrong?

(a) Both the gases Gi and G, are water soluble.

(b) Sublimate S, contains covalent bond and ionic bond.

(c) Sublimate, S when treated with caustic soda liberates $G_2$ treating conc. $H_{2}S{O}_4$ gas.

(d) Aqueous solution of each G, and G, gas is acidic in nature.(Odisha)

Question 11

Which of the following represents a correct chemical formula? Name it



$\left(a\right)$ $CaCl$

$\left(b\right)$ $BiP{O}_4$

$\left(c\right)$ $NaS{O}_4$

$\left(d\right)$ $NaS$

Use the data given in the following table to calculate the molar mass of naturally occurring argon isotopes:

Calculate the work done when $10$ moles of ideal gas expand isothermally and reversibly from a pressure of $10\text{atm}$ to $1\text{atm}$ at $300\text{K}$.

(Given : $R=2{\text{cal K}}^{-1}{\text{mol}}^{-1}$)

An energy of $68\text{eV}$ is required to excite a hydrogen like atom from its second Bohr orbit to the third Bohr orbit. If atomic number of atom is $Z$ and energy required to excite from 1st Bohr orbit to 3rd Bohr orbit is $K,$ then value of $K$ and $Z$ respectively are

Suggest a way to determine the
value
of water.

Which one is a chain growth polymer

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

Which compound act as oxidising agent only.

(1)$S{O}_2$

(2)$H_{2}S$

(3)$H_{2}S{O}_4$

(4)$HN{O}_2$

How would you explain the following observations?

(i) BeO is almost insoluble but BeSO₄ in soluble in water,

(ii) BaO is soluble but BaSO₄ is insoluble in water,

(iii) LiI is more soluble than KI in ethanol.

Which of the following compounds exist?

The vapour pressure of water at room temperature is lower by $5\%$ by dissolving a solute in it, then the approximately molality of solution is

Discuss
the general characteristics and gradation in properties of alkaline
earth metals.

The minimum amount of $A{g}_{2}C{O}_3\left(s\right)$ required to produce sufficient oxygen for the complete combustion of $C_2{H}_2$ which produces $11.2\text{L}$ of $C{O}_2$ at STP after combustion is:
(Molar mass of $Ag=108\text{g/mol}$)
$A{g}_{2}C{O}_{3\left(s\right)}\to 2A{g}_{\left(s\right)}+C{O}_{2\left(g\right)}+\frac{1}{2}{O}_{2\left(g\right)}$
$C_2{H}_2+\frac{5}{2}{O}_2\to 2C{O}_2+H_{2}O$

Which of the following crystal has a unit cell such that $a\ne b\ne c$ and $\alpha \ne \beta \ne \gamma \ne {90}^{\circ }$?

The radius ratio of $C{s}^{+}$ to $C{l}^{-}$ is 0.90. If the radius of $C{l}^{-}$ ion is $1.80\stackrel{\circ }{A}$, the false statement regarding the CsCl structure is ?