JEE Main entrance exam Question Bank Solutions for Chemistry (JEE Main)

Given, that `"E"_("O"_2//"H"_2"O")^circ` = + 1.23 V;

`"E"_("S"_2"O"_8^{2-}//"SO"_4^(2-))` = 2.05 V;

`"E"_("Br"_2//"Br")^circ` = 1.09 V;

`"E"_("Au"^{2+}//"Au")^circ` = + 1.4 V

The strongest oxidizing agent is:

In which of the following reaction, H₂O₂ is behaving as a reducing agent:

The missing structures A and B in the reaction sequence:

\[\ce{R-CH2-CH2OH ->[Al2O3][350°C] R-CH=CH2 ->[(i) O3][(ii) ZnH3O^⊕] RCHO + A;}\]

\[\ce{RCHO ->[Reduce] B;}\]

are:

Boron compounds behave as Lewis acids because of their ______.

In which delocalization of positive charge is possible:

Ge (II) compounds are powerful reducing agents, whereas Pb (IV) compounds are strong oxidants. It can be due to ______.

If there were 10 periods in a periodic table then maximum number of elements it can have is ______.

Which of the following reactions of alkanols does not involve \[\ce{C - O}\] bond breaking?

Oxidizing agent (A) used is ______.

\[\ce{Phenol ->[(i) NaOH][(ii) CO2/140°C] A ->[H+/H2O] B ->[Al2O3][CH3COOH] C}\]

In this reaction, the end product C is ______.

Sea water is found to contain 5.85% NaO and 9.50% MgCl₂ be weight of solution. The normal boiling point of sea water is ______°C assuming 80% ionisation for NaO and 50% ionisation of \[\ce{MgCl2 [Kb(H2O)}\] = 0.51 kg mole^-1 K].

In the following pairs, the one in which both transition metal ions are colourless is ______.

The transition metal ions responsible for colour in ruby and emerald are, respectively:

To prepare 3-ethylpentane-3-ol, the reactants needed are ______.

Hydrogen has three isotopes: protium (¹H), deuterium (²H or D) and tritium (³H or T). They have nearly the same chemical properties but different physical properties. They differ in ______.

Similarity in chemical properties of the atoms of elements in a group of the periodic table is most closely related to ______.

The correct decreasing order for the metallic character is ______.

The compound that cannot act both as oxidizing and reducing agent is ______.

Copper becomes green when exposed to moist air for a long period. This is due to ______

A group 13 element ‘X’ reacts with chlorine gas to produce a compound XCl₃. XCl₃ is electron deficient and easily reacts with NH₃ to form \[\ce{Cl3X –> NH3}\] adduct; however, XCl₃ does not dimerize X is ______.