WBJEE: Important Questions and Preparation Tips – Solid State

This article brings to you the chapter notes of Solid State including important concepts, formulae and previous year solved questions for WBJEE Entrance Examination 2018.  About 1-2 questions are always asked from this topic in WBJEE entrance examination. These notes will help all WBJEE aspirants to prepare well for the examination.

Created On: Oct 25, 2017 12:09 IST
Modified On: Oct 25, 2017 18:00 IST
WBJEE 2018: Soild State

The chapter Solid State is a very important part of Physical Chemistry in the syllabus of West Bengal Joint Entrance Examination (WBJEE) 2018.

After the detailed analysis of previous year papers and the latest syllabus of WBJEE Examination, our Subject Experts have prepared these notes including all the important topics like classification of solids, unit cell, primitive unit cell, centered unit cell, types of centered unit cell, crystal system etc.

These notes also contain some previous year solved questions which will help students to understand the type and difficulty level of the questions which can be asked in coming WBJEE Examination 2018.

These notes will help students to save their precious time and to cover maximum syllabus in minimum time just before the examination. These notes can be used as a quick revision material just before few days of the examination.

WBJEE Chemistry Syllabus: 2017 - 2018

Important Concepts:

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Some previous years solved questions are given below:

Question 1:

Suppose the mass of a single Ag atom is ‘m’. Ag metal crystallizes in fcc lattice with unit cell of length ‘a’. The density of Ag metal in terms of ‘a’ and ‘m’ is

Solution 1:

We know that in FCC lattice the coordination number is 12 and it contains 4 atoms per unit cell.

Mass of one atom = m

Mass of unit cell = 4m

Volume of unit cell = a3

So, the density of unit cell is given as:

Hence, the correct option is (a).

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Question 2:

Ionic solids with Schottky defect may contain in their structure

(a) cation vacancies only

(b) cation vacancies and interstitial cations

(c) equal number of cation and anion vacancies

(d) anion vacancies and interstitial anions

Solution 2:

Ionic solids with Schottky defect contain equal number of cation and anion vacancies.

Hence, the correct option is (c).

Question 3:

Solution 3:

Hence, the correct option is (a).

WBJEE Solved Sample Paper

Question 4:

Solution 4:

Hence, the correct option is (a).

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