Which of the following produces nitrogen gas after the reaction with nitrous acid?

Boron halides behave as Lewis acids because of their nature.

At \(300 \mathrm{~K}, \mathrm{~K}_{\mathrm{C}}\) for the reaction.
\(\mathrm{A}_2 \mathrm{~B}_2(\mathrm{~g}) \rightleftharpoons \mathrm{A}_2(\mathrm{~g})+\mathrm{B}_2(\mathrm{~g})\)
is \(100 \mathrm{~mol} \mathrm{~L}^{-1}\). What is its \(\mathrm{K}_{\mathrm{p}}\) (in atm) at the same temperature? \(\left(\mathrm{R}=0.082 \mathrm{~L} \mathrm{~atm}^{-1} \mathrm{~mol}^{-1}\right)\)

Carbohydrates are stored in plants and animals in which of the following forms respectively?

If the bond length and dipole moment of a diatomic molecule are \(1.25 \mathrm{~A}\) and \(1.0 \mathrm{D}\) respectively, what is the per cent ionic character of the bond?

The total number by amino acids present in insulin is

From the following, identify the reactions which are responsible for depletion of ozone layer.
\(\begin{aligned}
& \mathrm{Cl} \dot{\mathrm{O}}(g)+\mathrm{NO}_2(g) \rightarrow \mathrm{ClONO}_2(g) \\
& \mathrm{CF}_2 \mathrm{Cl}_2(g) \xrightarrow{\text { uv }} \mathrm{Cl}(g)+\dot{\mathrm{CF}}_2 \mathrm{Cl}(g) \\
& \dot{\mathrm{Cl}}(g)+\mathrm{CH}_4(g) \rightarrow \mathrm{HCl}(g)+\dot{\mathrm{C}} \mathrm{H}_3(g) \\
& \dot{\mathrm{C}} \mathrm{l}(\mathrm{g})+\mathrm{O}_3(g) \rightarrow \mathrm{Cl} \dot{\mathrm{O}}(g)+\mathrm{O}_2(g) \\
& \mathrm{Cl} \dot{\mathrm{O}}(g)+\mathrm{O}(g) \rightarrow \dot{\mathrm{C}} \mathrm{l}(g)+\mathrm{O}_2(g)
\end{aligned}\)

The lines \(L_1: y-x=0\) and \(L_2: 2 x+y=0\) intersect the line \(L_3: y+2=0\) at \(P\) and \(Q\) respectively. The bisector of the acute angle between \(\mathrm{L}_1\) and \(\mathrm{L}_2\) intersects \(\mathrm{L}_3\) at \(\mathrm{R}\).
Statement 1: PR : RQ \(=2 \sqrt{2}: \sqrt{5}\)
Statement 2: In any triangle, the bisector of an angle divides the triangle into two similar triangles.

Two point sources \(S_1\) and \(S_2\) separated by a distance \(10 \mu \mathrm{m}\) emit light waves of wavelength \(4 \mu \mathrm{m}\) in phase. A circular wire of radius \(40 \mu \mathrm{m}\) is placed around the sources as shown in figure, then ( \(O\) is the centre of the circle and \(O S_1=O S_2\) )

A hydrocarbon containing C and H has \(92.3 \% \mathrm{C}\). When 39 g of hydrocarbon was completely burnt in \(\mathrm{O}_2, x\) moles of water and y moles of \(\mathrm{CO}_2\) were formed. \(x\) moles of water is sufficient to liberate 0.75 moles of \(\mathrm{H}_2\) with Na metal. What is the weight (in g ) of oxygen consumed?
\((\mathrm{C}=12 \mathrm{u} ; \mathrm{H}=1 \mathrm{u})\)

Let \(n\) be a positive integer. If the coefficients of \(2^{\text {nd }}, 3^{\text {rd }}\) and \(4^{\text {th }}\) terms in the expansion of \((1+x)^n\) are in A.P, then the value of \(n=\)

If \(\tan \theta \cdot \tan \left(120^{\circ}-\theta\right) \tan \left(120^{\circ}+\theta\right)=\frac{1}{\sqrt{3}}\), then \(\theta\) is equal to

A car engine has a power of $20 \mathrm{kW}$. The car makes a roundtrip of 1 hour. If the thermal efficiency of the engine is $40\%$ and the ambient temperature is $300 \mathrm{K}$. The energy generated by fuel combustion is