19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Conversion of oxygen into ozone is non-spontaneous at (AIIPMT 2018)
Which of the following pair behaves as strong and weak base hydride respectively? (JIPMER 2018)
Which of the following chemicals are used to manufacture methyl isocyanate that caused “Bhopal Gas Tragedy” ? (JIPMER 2018) (i) Methylamine (ii) Phosgene (iii) Phosphine (iv) Dimethylamine
The correct order of N-compounds in its decreasing order of oxidation states is (NEET 2018)
Acidity of diprotic acids in aqueous solutions increases in the order (CBSE AIPMT 2014)
The correct arrangement of following acids of phosphorus in the increasing order of oxidation state of phosphorus is (Guj CET 2014)
In which of the following arrangements, the order is not strictly according to the property written against it? (AIIMS 2018)
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
The number of S—S bonds in sulphur trioxide trimer S3O9 is:
Which of the following does not have S—S linkage? (a) S O (b) S O (c) S O (d) S O