Chemistry Question Bank

Standard sodium thiosulphate solution is used in the estimation of iodine present in a solution. The equivalent weight of sodium thiosulphate which is required to make the standard solution is

When SO2 gas is passed into an acidified solution of K2Cr2O7, the oxidation state of chromium changes

Which of the following ions does not have an S—S linkage?

H2SO4 is manufactured from SO2(g) by the

Group 16 elements (except polonium) are called chalcogens because

The number of P—O—P bonds in cyclic metaphosphoric acid is

The number of P–O–P bonds in the structure of phosphorus pentoxide and phosphorus trioxide are respectively (2005)

Which of the following compounds consists of a P–P linkage?

Which of the following oxoacids of phosphorus is a reducing agent and a monobasic acid as well?

The true statement for the acids of phosphorus, H3PO2, H3PO3 and H3PO4 is

Which of the following structures represents hypophosphoric acid? (a) (b) (c) (d)

Which of the following statements is true for the H3PO3 molecule?

The reaction of white phosphorus with aqueous NaOH gives phosphine and another phosphorus containing compound. The reaction type, the oxidation states of phosphorus in phosphine and other product are respectively:

Syrupy H3PO4 is viscous due to

Solid PCl5 exists as

PH3 and NH3 on separate reaction with bleaching powder produce respectively

PCl5 on hydrolysis gives

White phosphorus reacts with NaOH to give PH3 and NaH2PO2. This reaction involves

On boiling phosphorus with KOH solution, product formed is

The reaction of P4 with X leads selectively to P4O6. The X is:

The percentage of p-character in the orbitals forming P–P bonds in P4 is:

Which of the following statements is correct regarding the behaviour of white phosphorus?

Red phosphorus is less reactive than white phosphorus because (a)the P—P bond length is greater in red phosphorus

The most stable allotropic form of phosphorus is

White phosphorus is more reactive than N2 because