The dipole moments of \(\mathrm{CCl}_{4}, \mathrm{CHCl}_{3}\) and \(\mathrm{CH}_{4}\) are in the order 

The standard electrode potential \(\left( M ^{3+} / M ^{2+}\right)\) for \(V\), \(Cr , Mn\) and \(Co\) are \(-0.26\,V ,-0.41\,V ,+1.57\,V\) and \(+1.97\,V\), respectively. The metal ions which can liberate \(H _2\) from a dilute acid are

Consider the following reactions. From these reactions which reaction will give carboxylic acid
as a major product ?
(A) \(\mathrm{R}-\mathrm{C} \equiv \mathrm{N} \xrightarrow[\text { mild condition }]{\text { (i) } \mathrm{H}^{+} / \mathrm{H}_2 \mathrm{O}}\)
(B) \(\mathrm{R}-\mathrm{MgX} \xrightarrow[\text { (ii) } \mathrm{H}_3 \mathrm{O}^{+}]{\text {(i) } \mathrm{CO}_2}\)
(C) \(\mathrm{R}-\mathrm{C} \equiv \mathrm{N} \xrightarrow[\text { (ii) } \mathrm{H}_3 \mathrm{O}^{+}]{\text {(i) } \mathrm{SnCl}_2 / \mathrm{HCl}}\)
(D) \(\mathrm{R} \cdot \mathrm{CH}_2 \cdot \mathrm{OH} \xrightarrow{\mathrm{PCC}}\)
(E)

Choose the correct answer from the options given below:

The number of geometric isomers that can exist for square planar complex \([Pt\, (Cl)\, (py)\, (N H_3) \,(NH_2O H)]^+\) is (\(py=\)pyridine) :

\(X Y\) is the membrane / partition between two chambers 1 and 2 containing sugar solutions of concentration \(c_1\) and \(c_2\left(c_1 \gt c_2\right) \mathrm{mol} \mathrm{L}^{-1}\). For the reverse osmosis to take place identify the correct condition
(Here \(p_1\) and \(p_2\) are pressures applied on chamber 1 and 2)

(A) Membrane/Partition; Cellophane, \(\mathrm{p}_1 \gt \pi\)
(B) Membrane/Partition ; Porous. \(\mathrm{p}_2 \gt \pi\)
(C) Membrane/Partition ; Parchment paper, \(\mathrm{p}_1 \gt \pi\)
(D) Membrane/Partition : Cellophane, \(\mathrm{p}_2 \gt \pi\)
Choose the correct answer from the option given below :

The correct order of \(\left[\mathrm{FeF}_6\right]^{3-},\left[\mathrm{CoF}_6\right]^{3-},\left[\mathrm{Ni}(\mathrm{CO})_4\right]\) and \(\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}\) complex species based on the number of unpaired electrons present is which?

\(4.5\) moles each of hydrogen and iodine is heated in a sealed ten litre vessel. At equilibrium, \(3\) moles of HI were found. The equilibrium constant for \(H _2( g )+ I _2( g ) \rightleftharpoons 2 HI ( g )\) is .......

The direction ratios of normal to the plane through the points \((0, -1, 0)\) and \((0, 0, 1)\) and making an angle \(\frac {\pi }{4}\) with the plane \(y -z + 5 = 0\)

Class \(XII\) students were asked to prepare one litre of buffer solution of \(pH\,8.26\) by their chemistry teacher. The amount of ammonium chloride to be dissolved by the student in \(0.2\,M\) ammonia solution to make one litre of the buffer is \(.....\,g\) (Given \(pK _{ b }\left( NH _{3}\right)=4.74\); Molar mass of \(NH _{3}=17\,g\,mol ^{-}\) ; Molar mass of \(NH _{4} Cl =53.5\,g\,mol ^{-1}\) )

The remainder when \((2021)^{2023}\) is divided by \(7\) is

A block of mass \(m = 10\,kg\) rests on a horizontal table. The coefficient of friction between the block and the table is \(0.05.\) When hit by a bullet of mass \(50\,g\) moving with speed \(v,\) that gets embedded in it, the block moves and comes to stop after moving a distance of \(2\,m\) on the table. If a freely falling object were to acquire speed \(\frac {v}{10}\) after being dropped from height \(H,\) then neglecting energy losses and taking \(g = 10\,ms^{-2},\) the value of \(H\) is close to ................. \(\mathrm{km}\)

\(1.80\,g\) of solute \(A\) was dissolved in \(62.5\,cm ^{3}\) of ethanol and freezing point of the solution was found to be \(155.1\,K\). The molar mass of solute \(A\) is \(..........g\,\,mol ^{-1}\). [Given: Freezing point of ethanol is \(156.0 K\) Density of ethanol is \(0.80\,g\,cm ^{-3}\). Freezing point depression constant of ethanol is \(\left.2.00\,K\,kg\,mol\,m ^{-1}\right]\)

The ionic radii of \(\mathrm{K}^{+}, \mathrm{Na}^{+}, \mathrm{Al}^{3+}\) and \(\mathrm{Mg}^{2+}\) are in the order: