Which one of the following complex ions is diamagnetic in nature?

Which of the given atoms has the greatest electron affinity?

Xenon hexafluoride on partial hydrolysis gives ' X ' and HF. The shape of ' X ' is

A solid mixture weighing 5 g contains equal number of moles of \(\mathrm{Na}_2 \mathrm{CO}_3\) and \(\mathrm{NaHCO}_3\). This solid mixture was dissolved in 1 L of water. What is the volume (in mL ) of 0.1 M HCl required to completely react with this 1 L mixture solution?

The most suitable solvent for Wurtz reaction is

The total number of overlapping \(p\)-orbitals present in cycloheptatrienyl cation is

Which one of the following is the mineral for tin?

A value of \(k\) such that the straight lines \(y-3 k x+4=0\) and \((2 k-1) x-(8 k-1) y\) \(-6=0\) are perpendicular is

\[ \begin{aligned} & \text { Given } \mathrm{H}_2(\mathrm{~g})+\frac{1}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{H}_2 \mathrm{O}(l) ; \Delta \mathrm{H}=-285 \mathrm{~kJ} \ & \mathrm{~N}_2 \mathrm{O}_5(\mathrm{~g})+\mathrm{H}_2 \mathrm{O}(l) \rightarrow 2 \mathrm{HNO}_3(l) ; \Delta \mathrm{H}=-76.6 \mathrm{~kJ} \ & \mathrm{~N}_2(\mathrm{~g})+3 \mathrm{O}_2(\mathrm{~g})+\mathrm{H}_2(\mathrm{~g}) \rightarrow 2 \mathrm{HNO}_3(l) ; \Delta \mathrm{H}=-348.2 \mathrm{~kJ} \ & \text { Calculate the } \Delta \mathrm{H} \text { of } 2 \mathrm{~N}_2(\mathrm{~g})+5 \mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{~N}_2 \mathrm{O}_5(\mathrm{~g}) \end{aligned} \] Calculate the \(\Delta \mathrm{H}\) of \(2 \mathrm{~N}_2(\mathrm{~g})+5 \mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{~N}_2 \mathrm{O}_5(\mathrm{~g})\).

If \((2, k)\) is a point on the parabola passing through the points \((1,-3),(-1,5),(0,2)\) and having its axis parallel to the \(Y\)-axis, then \(k\) is equal to

The coefficient of \(x^3 y^4 z^5\) in the expansion of \((x y+y z+x z)^6\) is

At \(300 \mathrm{~K}, 3.0\) moles of an ideal gas at 3.0 atm pressure is compressed isothermally to one half of its volume by an external pressure of 6.0 atm . The work done (in kJ ) is \(\left(\right.\) Given, \(\left.\mathrm{R}=0.082 \mathrm{~L} \mathrm{~atm} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\right)(1 \mathrm{~L} \mathrm{~atm}=101.3 \mathrm{~J})\)

If the distance between \(\mathrm{Na}^{+}\)and \(\mathrm{Cl}^{-}\)ions in sodium chloride crystal is ' \(Y\) ' \(\mathrm{pm}\). The length of the edge of the unit cell will be