The correct order of atomic radii of \(\mathrm{B}, \mathrm{Be}, \mathrm{N}\) and \(\mathrm{C}\) is

What are the formal charges on terminal oxygens of ozone molecule?

Methane of the polluted air reacts with ozone and forms the compounds.

A 10 L vessel contains 1 mole of an ideal gas with pressure of \(\mathrm{P}(\mathrm{atm})\) and temperature of \(\mathrm{T}(\mathrm{K})\). The vessel is divided into two equal parts. The pressure (in atm) and temperature (in K ) in each part is respectively

Study the following table:
\begin{array}{c|c|c}
\hline \begin{array}{c}\text { Buffer } \\
\text { Solution }\end{array} & \begin{array}{c}\text { Volume (in } \mathrm{mL} \text { ) of } \\
\text { 0.M Weak acid }\end{array} & \begin{array}{c}\text { Volume (in } \mathrm{mL} \text { ) of } \\
0.1 \mathrm{M} \text { sodium salt of } \\
\text { weak acid }\end{array} \\
\hline I. & 4.0 & 4.0 \\
II. & 4.0 & 40.0 \\
III. & 40.0 & 4.0 \\
IV. & 0.1 & 10.0 \\
\hline
\end{array}
Which of the two sets of butter solutions have least \(\mathrm{pH}\) ?

The oxides of nitrogen obtained by the reaction of nitric acid with
(i) \(\mathrm{P}_4 \mathrm{O}_{10}\), (ii) \(\mathrm{P}_4\) respectively are

The number of \(\mathrm{d}\) - electrons in \(\mathrm{Cr}^{3+}\) ion \((\mathrm{Z}=24)\) is

A block of mass \(m=25 \mathrm{~kg}\) sliding on a smooth horizontal surface with a velocity \(v=3 \mathrm{~ms}^{-1}\) meets the spring of spring constant \(k=100 \mathrm{~N} / \mathrm{m}\) fixed at one end as shown in figure. The maximum compression of the spring and velocity of block as it returns to the original position respectively are

\(\mathrm{Me}_3 \mathrm{SiCl}\) is used during polymerisation of organosílicones because

The ion with smallest radius among the following is

Which of the following are correct?
(i) \(\mathrm{V}^{2+}\) liberates hydrogen from a dilute acid
(ii) The earlier members of lanthanide series behave more like aluminium
(iii) The 'silver' UK coins are made of \(\mathrm{Cu} / \mathrm{Ni}\) alloy
(iv) The maximum oxidation state exhibited by Neptunium is +7

Thermodynamically most stable allotrope of carbon is

As shown in the figure, two infinitely long straight parallel wires \(P\) and \(Q\) carrying equal currents in opposite directions are arranged parallel to \(\mathrm{Y}\)-axis. If the magnetic field due to wire \(\mathrm{P}\) at the origin ' \(\mathrm{O}\) ' of the co-ordinate system is B, then match the resultant magnetic fields at various points given in column \(A\) with the points given in column \(B\).
\(\begin{array}{ll}
\text{Column A} & \text{Column B} \\
\text{A)} \frac{B}{4} & \text{i)} (0,0) \\
\text{B)} \frac{B}{2} & \text{ii)} (a, 0) \\
\text{C)} \frac{2 \mathrm{~B}}{3} & \text{iii)} (2a, 0) \\
\text{D)} 2 \mathrm{~B} & \text{iv)} (3 \mathrm{a}, 0) \\
\end{array}\)


The correct answer is