19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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
Solid PCl5 exists as
PH3 and NH3 on separate reaction with bleaching powder produce respectively
Which of the following statements is correct regarding the behaviour of white phosphorus?
PCl5 on hydrolysis gives
White phosphorus reacts with NaOH to give PH3 and NaH2PO2. This reaction involves
FeSO4 is a very good absorber for NO. The number of unpaired electrons in the new compound formed by this process is
White phosphorus is more reactive than N2 because
Which of the following oxides of nitrogen is a mixed anhydride of two acids?
Liquid N2O4 self-ionizes as
Which of the following reactions gives reasonably pure NO?
At present, HNO3 is industrially prepared by the
Phosphorus reacts with concentrated HNO3 to produce
Iodine reacts with concentrated HNO3 to produce
Gold reacts with aqua regia forming
Platinum reacts with aqua regia to produce chloroplatinic acid represented by the formula
Which one of the following is not an ore of phosphorus?
Which of the following forms strong p - p bonding
N2 is commercially prepared by
Which of the following reactions is used in the preparation of N2?
Small quantities of very pure N2 is obtained by carefully warming