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Solids: MCQs, FAQs and Answers with Explanation

1. The temperature at which two or more types of crystals exist in equilibrium is called





... Answer is b)
Explanation: Option b is correct. The transition temperature is the temperature at which two substances co-exist and above or below of this temperature, only one substance exists.

2. The solids in which atoms, ions or molecules have random and non-repetitive three dimensional arrangments are termed as





... Answer is b)
Explanation: Amorphous solids are the solids which have particles without organized pattaren. Glasses are called amorphous solids because when they do not solidify even below the melting point or transition temperature and further cooled to achieve disorderd arrangments of particles.

3. The nature of bond in diamond is





... Answer is b)
Explanation: In diamond, carbon is sp3 hybridized. sp3 hybridized orbitals of carbon atoms overlap to form covalent bonds. Hence, diamond is covalent solids.

4. Crystal lattic is an arrangment of particles in





... Answer is c)
Explanation:Arrangment of particles crystal lattic is in three dimensions.

5. lattice energy is called





... Answer is a)
Explanation: Lattice energy also knwon as crystal energy is defined as the amount of energy released when one mole of ionic solid is formed from gaseous ions.

6. When gaseous ions are allowed to form a crystal, energy





... Answer is a)
Explanation: During the formation of crystal, energy is released due to formation of ionic bonds.

7. NaF and MgO have both atomic ratio 1:1 in their crystals such property is





... Answer is b)
Explanation: The phenomenon in which different substances have same crystalline form is called isomorphism.

8. Electric current can pass through graphite in one direction but not through other direction of crystals, such property is called





... Answer is b)
Explanation: A substance that shows different intensity of properties in different directions is called anisoptropic substance and this property called anisotropy.

9. Iron acts as an electrical conductor due to





... Answer is a)
Explanation: According to electron gas theory, metals have electron sea or gas or electron cloud in which positive metals ions are held together due to force of attractions among electron and positively charged ions. This theory successfuly explain the conductance of metals.

10. An insoluble solid was dropped into a measuring cylinder containing 50 cm3 of water. What will be the effect on volume of water?





... Answer is d)
Explanation: The volume of water is increased when insoluble solid is dropped int it.
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