19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following statements about the interstitial compounds is incorrect? (NEET 2013)
Which of the following processes does not involve oxidation of iron? (NEET 2015)
The electronic configurations of Eu (Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No. 65) are (NEET-I 2016)
Name the gas that can readily decolourise acidified KMnO4 solution. (NEET 2017)
Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code (NEET 2018) Column I Column II A. Co3+ i. 8 B.M. B. Cr…
The catalytic activity of transition metals and their compounds is ascribed mainly to (Mains 2012)
Which one of the following ions exhibits d-d transition and paramagnetic as well? (NEET 2018)
reacts with OH– as CrO 2CrO 2H Cr O H O -> Cr O The change in oxidation number of Cr is
When neutral or faintly alkaline KMnO4 is treated with potassium iodide, iodide ion is converted into ‘X’. ‘X’ is (Odisha NEET 2019)
The calculated spin only magnetic moment o 2+ Cr ion is : (NEET 2020)
Identify the incorrect statement. (NEET 2020)
Identify the incorrect statement. (NEET 2020)
Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of: (NEET 2021)
The incorrect statement among the following is: (NEET 2021)
Give the correct order of initials T or F for the following statements. Use T if the statement is true and F if it is false. (I) Sulphide ions reacts with Na2 [Fe(CN)5(NO)] to form a purple-coloured compound Na4 [Fe(C…
Philosopher’s wool when heated with BaO at 1100ºC gives the compound :
Spiegeleisen is an alloy of :
Sodium thiosulphate, Na2S2O3. 5H2O is used in photography to :
Assertion : The melting point of Mn is more than that of Fe. Reason : Mn has higher number of unpaired e– than Fe in atomic state.
Assertion : Hg is the only metal that is liquid at 0ºC. Reason : It has a very high I.P. and weak metallic bond.
Acidified K2Cr2O7 on treatment with KI produces
Na2CrO4 on treatment with lead acetate gives a precipitate. This precipitate is dried and the solid is used as a pigment for road signs and markings. The solid is known as
When hydrogen peroxide is added to an acidic solution of a dichromate, the most probable product is
CrO3 dissolves in aqueous NaOH to give (a) CrO
reacts with H+ as The change in oxidation number of Cr is