19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which one of the statements is incorrect for aluminium metals?
Aluminium exhibits +3 oxidation state. As we move down the group, +1 oxidation state gets more stable. This is a consequence of
Group 13 elements show +1 and +3 oxidation states. Relative stability of +3 oxidation state may be given as (a) Tl Ga Al B In + + + + + > > > > (b) B Al Ga In Tl + + + + + > > > > (c) Al Ga Tl In B + + + + + > > > > (…
The stability of +1 oxidation state increases in the se- quence:
Ionisation enthalpy i ( H kJ mol ) - D for the elements of Group 13 follows the order
Trimethylammonia is pyramidal whereas trisilylammonia is a planar molecule. Why ?
Specify the coordination geometry around and hybrid- ization of N and B atoms in 1:1 complex of BF3 and NH3:
Which of the following is a Lewis acid ?
The correct arrangement of following acids of phosphorus in the increasing order of oxidation state of phosphorus is (Guj CET 2014)
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
Liquid I2 Cl6 has the structure (a)
The property of halogens, that indicated incorrect is:
NH4Cl is preferred to NaCl for the preparation of HCl by the action of concentrated H2SO4 because
When H2S gas is passed into aqueous sulphur dioxide
Na2SO3 on being heated with sulphur produces