The diameter of colloidal particle ranges from

For the reaction \(\mathrm{A}_2+\mathrm{B}_2 \cdots \rightarrow 2 \mathrm{AB}, \Delta \mathrm{H}_{\mathrm{f}}=-400 \mathrm{~kJ} / \mathrm{mol}\). The bond dissociation enthalpies of \(\mathrm{A}_2\), \(\mathrm{B}_2\) and AB are in the ratio \(1: 0.75: 1\). What is the bond dissociation enthalpy of \(\mathrm{B}_2 \mathrm{in} \mathrm{kJ} / \mathrm{mol}\) ?

Which of the following statements is incorrect?

Which of the following compounds will show geometrical isomerism?

Arrange the following in the decreasing order of their Dipole moments.
a. Chlorobenzene
b. 1,2-Dichlorobenzene
c. 1,3-Dichlorobenzene
d. 1,4-Dichlorobenzene.

The Crystal Field Stabilisation energy of (i) \([\text{CoF}_6]^{3-}\) and (ii) \([\text{Fe}(\text{H}_2\text{O})_6]^{3+}\) are ----- and ------- respectively.

A reaction between a carbonyl compound and a Grignard reagent is termed as

In Young's double slit interference experiment, using two coherent waves of different amplitudes, the intensities ratio between bright and dark fringes is 3 . Then, the value of the ratio of the amplitudes of the wave that arrive there is

What is the dimensional formula for electric flux?

Match the metals in Column II with their characteristic properties given in Column I.
\(\begin{array}{|c|l|c|c|} \hline & \text { Properties } & & \text { Metals } \\ \hline \text { A } & \text { Lanthanoid with low value of } 3^{\text {rd }} \text { ionisation enthalpy. } & P & V \\ \hline \text { B } & \text { f-Block element with electronic configuration }[\mathrm{Rn}] 6 \mathrm{~d}^2 7 \mathrm{~s}^2 & Q & G d \\ \hline \text { C } & 3 \mathrm{~d} \text {-series metal whose } \mathrm{M}^{3+}{ }_{(\mathrm{aq})} \text { is colourless. } & R & T h \\ \hline \text { D } & 3 \mathrm{~d} \text {-series metal with highest } \Delta \mathrm{H}_{(\text {atomisation })} & S & S c \\ \hline \end{array}\)

An artificial radioactive isotope gave \({ }_{7}^{14} \mathrm{~N}\) after two successive \(\beta\)-particle emissions. The number of neutrons in the parent nucleus must be

\(\text { The area (in sq units) enclosed by the parabola } y^2=8 x \text {, its latus-rectum and the } x \text {-axis is }\)

Shortest distance between the lines
\(\vec{r}=(8+3 \lambda) \hat{\imath}-(9+16 \lambda) \hat{\jmath}+(10+7 \lambda) \hat{k}\) and \(\vec{r}=15 \hat{\imath}+29 \hat{\jmath}+5 \hat{k}+\mu(3 \hat{\imath}+8 \hat{\jmath}-5 \hat{k})\) is