19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following gases is the least reactive?
An aqueous solution of ammonia consists of
Which of the following oxides is the most acidic?
Among the following compounds of nitrogen and hydrogen, the most acidic compound is
Which of the following is the increasing order of enthalpy of vaporization?
Which one of the following compounds is most explosive?
The tendency of nitrogen halides to act as Lewis bases decreases in the order
Which of the following halides of nitrogen is stable?
Among the following, the element that does not show allotropy is
The element which forms oxides in all oxidation states +I to + V is :
The most stable oxidation states of nitrogen are
Which of the following elements can have both positive and negative oxidation states?
Assertion: The electronic structure of O3 is Reason: The following structure is not allowed because the octet around O cannot be expanded.
Assertion: O3 has a fishy smell. Reason: It absorbs red part of the visible light.
Assertion: Although PF5, PCl5 and PBr5 are known, the pentahalides of nitrogen have not been observed. Reason: Phosphorous has a lower electronegativity than nitrogen.
Assertion: HNO3 is a stronger acid than HNO2. Reason: In HNO3 there are two nitrogen to oxygen bonds whereas in HNO2 there is only one.
The shape of XeO2F2 molecule is:
The oxidation state of xenon atom in XeF4, HXeO and Na4XeO6 are respectively:
When F2 reacts with hot and conc. alkali, then following will be obtained: (i) OF2 (ii) O2 (iii) H2O (iv) NaF
Dry Cl2 reacts with dry SO2 to form:
Which of the following oxides of chlorine is obtained by passing dry chlorine over silver chlorate at 900C?
HClO4 + P2O5 -> (A) + (B)
Urea reacts with water to form A which will decomposes to form B. B when passed through Cu2+ (aq), deep blue color solution C is formed. What is the formula of C from the following. (NEET 2020)
In which of the following, oxidation state of phosphorus is +3? (JIPMER 2019)
Which of the following oxoacids of phosphorus has strongest reducing property? (NEET (Odisha)2019)