19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Anodising can be done by electrolysing dilute H₂SO₄ with aluminium as anode. This results in :
Assertion : PbI₄ is a stable compound. Reason : Iodide stabilizes higher oxidation state.
Assertion : SiF - is known but SiCl - is not. Reason : Size of fluorine is small and its lone pair of electrons interacts with d-orbitals of Si strongly.
Assertion : Between SiCl₄ and CCl₄, only SiCl₄ reacts with water. Reason : SiCl₄ is ionic and CCl₄ is covalent.
Assertion : Pb⁴⁺ compounds are stronger oxidising agents than Sn²⁺ compounds. Reason : The higher oxidation states for the group 14 elements are more stable for the heavier members of the group due to ‘inert pair effe…
Assertion : In water, orthoboric acid behaves as a weak monobasic acid. Reason : In water, orthoboric acid acts as a proton donor.
Assertion : Boron is p block element. Reason : Last electron entres in p sub shell.
Assertion : Boron always forms covalent bond. Reason : The small size of B³⁺ favours formation of co- valent bond.
Assertion : AlF₃ is soluble in KF but addition of BF₃ brings its precipitation. Reason BF₃ is more acidic than AlF₃.
Assertion : BF₃ is a weaker Lewis acid than BCl₃. Reason : BF₃ molecule is stabilized to a greater extent than BCl₃ by B—F p-bonding.
Assertion : Al(OH)₃ is amphoteric in nature. Reason : Al—O and O—H bonds can be broken with equal ease in Al (OH)₃.
When an inorganic compound (X) having 3C—2e as well as 2c—2e bonds reacts with ammonia gas at a cer- tain temperature, gives a compound (Y), isostructural with benzene. Compound (X) with ammonia at a high temperature …
A metal X reacts with aqueous NaOH solution to form Y and a highly inflammable gas. Solution Y is heated and CO₂ is poured through it. Z precipitates out and Na₂CO₃ is formed. Z on heating gives Al₂O₃, Identify X, Y a…
NH₄Cl is preferred to NaCl for the preparation of HCl by the action of concentrated H₂SO₄ because
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