How many numbers of P-0H and P-0-P bonds are present in pyrophosphoric acid respectively?

Identify chiral molecule from following.

Select the catalyst used in hydrogenation of ethene.

Which of the following molecules shows intramolecular hydrogen bonding?

Which among the following is NOT a feature of \(\mathrm{S}_{\mathrm{N}} 1\) mechanisms?

How many electrons flow when a current of 5 amp is passed through a cell for 200 sec?

Which of the following amines forms a clear solution when treated with benzene sulphonyl chloride and excess of potassium hydroxide?

A coil having effective area ' \(\mathrm{A}\) ' is held with its plane normal to a magnetic field of induction ' \(\mathrm{B}\) '. The magnetic induction is quickly reduced to \(25 \%\) of its initial value in 1 second. The e.m.f. induced in the coil (in volt) will be

Carbon monoxide combines with haemoglobin to form ___________ .

If \(\overline{\mathrm{a}}, \overline{\mathrm{b}}, \overline{\mathrm{c}}\) are non-coplanar vectors and \(\overline{\mathrm{p}}=\frac{\overline{\mathrm{b}} \times \overline{\mathrm{c}}}{[\overline{\mathrm{a}} \overline{\mathrm{b}} \overline{\mathrm{c}}]}, \overline{\mathrm{q}}=\frac{\overline{\mathrm{c}} \times \overline{\mathrm{a}}}{[\overline{\mathrm{a}} \overline{\mathrm{b}} \overline{\mathrm{c}}]}, \overline{\mathrm{r}}=\frac{\overline{\mathrm{a}} \times \overline{\mathrm{b}}}{[\overline{\mathrm{a}} \overline{\mathrm{b}} \overline{\mathrm{c}}]}, \quad\) then \(2 \overline{\mathrm{a}} \cdot \overline{\mathrm{p}}+\overline{\mathrm{b}} \cdot \overline{\mathrm{q}}+\overline{\mathrm{c}} \cdot \overline{\mathrm{r}}=\)

If the excess pressure inside a soap bubble of radius \(3 \mathrm{~mm}\) is equal to the pressure of a water column of height \(0.8 \mathrm{~cm}\), then the surface tension of the soap solution is ( \(\rho_{\text {water }}=1000 \mathrm{~kg} / \mathrm{m}^3, g=9.8 \mathrm{~m} / \mathrm{s}^2\) )

Heat engine operating between temperature \(T_1\) and \(T_2\) has efficiency \(\frac{1}{6}\). When \(T_2\) is lowered by 62 K , its efficiency increases to \(\frac{1}{3}\). Then \(\mathrm{T}_1\) and \(\mathrm{T}_2\) respectively are

A box contains 9 tickets numbered 1 to 9 both inclusive. If 3 tickets are drawn from the box one at a time, then the probability that they are alternatively either {odd, even, odd} or {even, odd, even} is