19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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.
Which of the following group of transition metals is called coinage metals? (RPMT 2008)
Identify the alloy containing a non-metal as a constituent in it. (AIPMT-2012)
The catalytic activity of transition metals and their compounds is ascribed mainly to (Mains 2012)
Sc (Z = 21) is a transition element but Zn (Z = 30) is not because (NEET 2013)
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)
The transition metals sometimes form nonstoichiometric compounds. These compounds have (a) definite structures and definite proportions
Which of the following compounds is green in colour ?
KMnO4 is manufactured on a large scale by (a)fusing MnO2 with KOH and then oxidizing the fused mixture with KNO3
is prepared by treating a solution containing Mn2+ ions with a very strong oxidizing agent such as
KMnO4 in an acidic medium will not oxidize (a) (b)
Which of the following is an incorrect statement ? (a)In a redox reaction in acidic medium, KMnO4 produces Mn2+ ions. (b)In a redox reaction in strongly alkaline medium, KMnO4produces MnO ions. (c)In a redox reaction …