19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following complexes is responsible for the brown colour of the ring formed in the ring test for the nitrates? (a)[Fe(CN)5NO]3+ (b)[Fe(H2O)4NO]2+NO+
FeSO4 is a very good absorber for NO. The number of unpaired electrons in the new compound formed by this process is
Which statement is wrong for NO ?
Which of the following oxides of nitrogen is solid?
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
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.
White phosphorus is kept under
Which of the following statements is correct?
Which one of the following is not an ore of phosphorus?
Platinum reacts with aqua regia to produce chloroplatinic acid represented by the formula
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)
When iodine is treated with a mixture of NaF, NaBr and NaCl in water, it gives