Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Chemistry

Methanol and ethanol are miscible in water due to ____________.

If ethanol dissolves in water, then which of the following would be observed:

Which of the following is correct?

The function of glucose is to ____________.

Which of the following condition is not satisfied by an ideal solution?

Which relationship is not correct?

The boiling points of hydrides of group 16 are in the order:

The formation of \[\ce{O^+_2[PtF6]^-}\] is the basis for the formation of first xenon compound. This is because ____________.

Wood spirit is known as acetone:

Which of the following statement is incorrect?

Match the items of Columns I and II and mark the correct option.

Assertion: Presence of a nitro group at ortho or para position increases the reactivity of haloarenes towards nucleophilic substitution.

Reason: Nitro group, being an electron-withdrawing group decreases the electron density over the benzene ring.

Which of the following is an example of a solid solution?

Alkenes decolourise bromine water in presence of CCl₄ due to formation of ______.

Given below are two statements labelled as Assertion (A) and Reason (R).

Assertion (A): Electron gain enthalpy of oxygen is less than that of Flourine but greater than Nitrogen.

Reason (R): Ionisation enthalpies of the elements follow the order Nitrogen > Oxygen > Fluorine.

Select the most appropriate answer from the options given below:

The correct order of the packing efficiency in different types of unit cells is ______.

The edge lengths of the unit cells in terms of the radius of spheres constituting fcc, bcc and simple cubic unit cell are respectively ______.

Assertion: The total number of atoms present in a simple cubic unit cell is one.
Reason: Simple cubic unit cell has atoms at its corners, each of which is shared between eight adjacent unit cells.

If two liquids A and B form minimum boiling azeotrope at some specific composition then ______.

Intermolecular forces between two benzene molecules are nearly of same strength as those between two toluene molecules. For a mixture of benzene and toluene, which of the following are not true?

(i) ∆_mix H = zero

(ii) ∆_mix V = zero

(iii) These will form minimum boiling azeotrope.

(iv) These will not form ideal solution.