## The Solid State Quiz-11

IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies. Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

Q1.Statement 1: Band gap in germanium is small. Statement 2: The energy spread of each germanium atomic energy level is infinitesimally small.
•  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is False
•  Statement 1 is False, Statement 2 is True
Solution

Q2.Statement 1: Bragg’s equation has no solution if n=2 and Î»=d. Statement 2: Bragg’s equation is : nÎ»=2d sin⁡Î¸ :
•  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is False
•  Statement 1 is False, Statement 2 is True
Solution
(c) If n=2 and Î»>d then sin Î¸ > 1 which is not possible.

Q3.  Statement 1: 6 : 6 co-ordination at normal temperature and pressure changes to 8 : 8 co-ordinations at high pressure. Statement 2: Pressure influences the structure of solids.
•  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is False
•  Statement 1 is False, Statement 2 is True
Solution
(c) Explanation is correct reason for statement.

Q4. Statement 1: Solids having more F-centres possess intense colours. Statement 2: Excess of Na^+ in NaCl solid having F-centres makes it appear to pink.
•  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is False
•  Statement 1 is False, Statement 2 is True
Solution
(a) Excess of Na^+ in NaCl solid at F-centres develops yellow colour.

Q5.Statement 1: The size of a cation is larger in TV than in OV Statement 2: Cations occupy more space than anions is crystal packing
•  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is False
•  Statement 1 is False, Statement 2 is True
Solution
(c) Correct (A): OV is larger in size than TV Correct (R):Cations are generally smaller. They occupy voids instead of lattice points and hence occupy less space

Q6. Statement 1: The close packing of atoms in cubic structure is in the order, fcc > bcc > sc. Statement 2: Packing density = (volumes of unit cell)/a^3
•  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is True; Statement 2 is notcorrect explanation for Statement 1
•  Statement 1 is True, Statement 2 is False
•  Statement 1 is False, Statement 2 is True
Solution
(c) Explanation is correct reason for statement.

Q7.Statement 1: Zinc blende and wurtzite both have fcc arrangement of S^(2-) ions Statement 2: A unit cell of both has four formula units of ZnS
•  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is False
•  Statement 1 is False, Statement 2 is True
Solution
(c) Correct (A):Zinc blende has fcc arrangement of S^(2-)ions while wurtzite has hcp arrangement of S^(2-) ions Correct (R):A unit cell of zinc blende has 4 formula units while that of wurtzite has 6 formula units of ZnS

Q8.Statement 1: Non-stoichiometric compounds are called Bertholide compounds. NaCl and KCl crystal, when heated in an atmosphere of Na and K vapours, respectively, they impart violet and yellow colours to NaCl and KCl, respectively Statement 2: Metal excess defect is due to the presence of extra cations at the interstitial sites. The excess metal ions move to the interstitial sites and the electrons to the neighbouring sites. The colour results by the excitation of these electrons by absorbing suitable energy from visible light. When the excited electron comes back to the ground state, there is emission of radiation in the visible region and gives complimentary colour
•  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is False
•  Statement 1 is False, Statement 2 is True
Solution
(d) Correct (A): NaCl and KCl impart yellow and violet colour, respectively (R) is correct but not correct explanation of (A)

Q9.Statement 1: hcp is more closely packed than ccp Statement 2: hcp has a CN of 12, whereas ccp has a CN of 8
•  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is False/span>
•  Statement 1 is False, Statement 2 is True
Solution
(c) Correct (A):hcp and ccp are equally closest packed since space occupied in both = 74% Correct (R):Both have CN=12

Q10.Statement 1: Solids containing F-centres are paramagnetic. Statement 2: F-centres solids possess holes occupied by unpaired electrons.
•  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is False
•  Statement 1 is False, Statement 2 is True
Solution
(c) Explanation is correct reason for statement.

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