19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The gases absorbed by alkaline pyrogallol and oil of cinnamon are respectively
At room temperature, O3 is absorbed by
A gas ‘X’ is used in filling balloons for meteorological observations. It is also used in gas-cooled nuclear reactors. Here, the gas X is (AIIMS 2018)
Ozone is an extremely powerful oxidizing agent. It is
Which of the following statements is correct?
Ozonized oxygen is a mixture of
Ozone is prepared by the action of silent electric discharge upon oxygen in an apparatus called ozonizer. The reaction
In ozone, the central oxygen atom uses
Which of the following has pπ – dπ bonding ? (a) NO (b) SO (c) BO (d) CO
The number of lone pairs and the number of S—S bonds in S8 molecules are respectively:
Which of the following statements regarding sulphur is incorrect?
The stability of the hydrides of oxygen, sulphur, selenium and tellurium decreases in the order
Oxygen is more electronegative than sulphur, yet H2S is acidic in nature while H2O is neutral because:
In which of the following species, S-atom assumes sp3 hybrid state? (I) SO3 (II) SO2 (III) H2S (IV) S8
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
White phosphorus reacts with concentrated HNO3 to give