19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
A green coloured solution of a salt changes its colour to light pink on passing ozone through it. Which of the following species represent pink and green colour respectively ?
In the presence of water, sulphur is oxidized by ozone to give
The gases absorbed by alkaline pyrogallol and oil of cinnamon are respectively
Group 16 elements (except polonium) are called chalcogens because
The most stable oxidation states of nitrogen are
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
White phosphorus reacts with concentrated HNO3 to give
In NO ion, the number of bond pairs and lone pair of electrons on nitrogen atom are
The bond order in the NO molecule is
A solution of sodium in liquid ammonia is blue due to the presence of
Ammonia, on reaction with excess of chlorine, gives :
Ammonia gas can be dried by
Mg (NH4)PO4 and Na(NH4) HPO4 are heated separately. Which of the following statements is/are completely incorrect regarding the product obtained in the above process? (I) Same gas is evolved (II) Same type of phosphat…
Which of the following fertilizers on repeated application would increase the acidity of the soil?
The reaction between urea and nitrous acid produces
Which of the following compounds does not give N2 on heating?
Small quantities of very pure N2 is obtained by carefully warming