Solid State

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Solid State - 05

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Q1. When an element of group 14 is doped with an element of group 15 *

1 point

Electrolytes are formed

p-type of semi-conductors are formed

Zeolites are formed

n-type of semi-conductors are formed

Q2. Antiferromagnetic property is given as *

1 point

Q3. Substances which are magnetic but having less magnetic moment than theoretically calculated value arecalled *

1 point

Antiferromagnetic

Ferrimagnetic

Diamagnetic

Ferromagnetic

Q4. In antiferromagnetism *

1 point

Alignments of magnetic moments varies with the nature of the material

Alignments of magnetic moments does not take place

Alignments of magnetic moments in one direction is compensated by alignments in the opposite directions

Alignments of magnetic moments is additive

Q5. Which is true about Piezoelectric crystals? *

1 point

They produce an electric current on heating

They produce an electric current when a mechanical stress is applied

They are magnetic in nature

They are insulators

Q6. When a crystal having rock salt type geometry is heated in the presence of it’s metal vapour then defect init will be *

1 point

Stoichiometric defect

Anion excess defect

Metal excess defect

Frenkel defect

Q7. The mass percentage of Fe3+ ion present in Fe0.93 O1.00 is *

1 point

5.5 %

11.5 %

10 %

15 %

Q8. If 1 mole of NaCl is doped with 10–3 mole of SrCl2. What is the number of cationic vacancies per mole of NaCl? *

1 point

10^50 mole–1

10^–3 mole–1

6.02 × 10^18 mole–1

6.02 × 10^20 mole–1

Q9. Tungsten crystallizes in a body-centred cubic lattice. Calculate the number of unit cells in 1.5 g of tungsten(W = 184U.) *

1 point

2.45 x 10^21 atoms

5.40 x 10^23 atoms

9.81 x 10^21 atoms

6.47 x 10^23 atoms

Q10. Three elements X, Y and Z crystallise into a cubic solid lattice. Atoms A occupy the corners, B occupy the cube centres and C occupy the edges centre. What is the formula of the compound? *

1 point

A2BC

ABC3

AB2C3

ABC

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