JEE Main entrance exam Question Bank Solutions

If 10⁻⁴ dm³ of water is introduced into a 1 dm³ flask at 300 K, how many moles of water are in the vapour phase when equilibrium is established?

(Given: Vapour pressure of H₂O at 300 K is 3170 Pa; R = 8.314 JK⁻¹ mol⁻¹)

The exothermic formation of ClF₃ is represented by the equation:

\[\ce{Cl2(g) + 3F2(g) <=> 2ClF3(g)}\]; ΔH = −329 kJ

Which of the following will increase the quantity of ClF₃ in an equilibrium mixture of Cl₂, F₂ and ClF₃?

The conversion of benzene diazonium chloride to bromobenzene can be accomplished by ______.

The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are ______.

In a basic medium, H₂O₂ exhibits which of the following reactions?

(A) \[\ce{Mn^{2+} -> Mn^{4+}}\]

(B) \[\ce{I2 -> I^-}\]

(C) \[\ce{PbS -> PbSO4}\]

Choose the most appropriate answer from the options given below.

The strength of the 11.2 volume solution of H₂O₂ is ______.

[Given that molar mass of H = 1 g mol⁻¹ and O = 16 g mol⁻¹)

Insulin production and its action in human body are responsible for the level of diabetes. This compound belongs to which of the following categories?

Which one of the following class of compounds is obtained by polymerization of acetylene?

Which of the following order is correct:

Alkynes are isomers of ______.

3.5 g of a fuel (with molecular weight 28), was burnt in a calorimeter and raised the temperature of 1 g water from 25° C to 67.3° C. If all the heat generated was used in heating water, the heat of combustion of fuel is ______ k cal.

For micelle formation, which of the following statements are correct?

1. Micelle formation is an exothermic process.
2. Micelle formation is an endothermic process.
3. The entropy change is positive.
4. The entropy change is negative.

20% surface sites have adsorbed N₂. On heating N₂ gas evolved from sites and were collected at 0.001 atm and 298 K in a container of volume is 2.46 cm³. Density of surface sites is 6.023 × 10¹⁴/cm² and surface area is 1000 cm², the no. of surface sites occupied per molecule of N₂ is ______.

Spin only magnetic moment of [MnBr₆]^4- is ______ B.M. (Round off to the closest integer)

The spin-only magnetic moment value for the complex [Co(CN₆)]^4- is ______ BM. [At. no. of Co = 27]

In an ore of iron, iron is present in two oxidation state Feⁿ⁺ and `"Fe"^(("n"+1)+)`. Number of `"Fe"^(("n"+1)+)` is twice the number of Feⁿ⁺. If empirical formula of ore is Fe_xO. The value of [x × 100] is ______.

A is:

A substance was known by its mode of synthesis to contain 10 atoms of carbon per molecule along with unknown number of atoms of chlorine hydrogen and oxygen. Analysis showed 60.5% carbon, 5.55% hydrogen, 16.10%j oxygen and 17.9% chlorine. The Empirical formula of the compound is ______.

In a certain region of space there are only 5 molecules per cm³ on average. The temperature is 3 K. The average pressure of this very dilute gas is ______ × 10^-21 atoms. 

The activating nature of \[\ce{- CH3}\] group linked to benzene ring can be explained with the help of ______.