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

Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?

The correct options for the products A and B of the following reactions are:

The ratio of number of water molecules in Mohr's salt and potash alum is ______ × 10^-1.

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 ______.