MEDIUM
10th CBSE
IMPORTANT
Earn 100

(i) Why do covalent compounds occur in the form of gases or liquids?

(ii) Why do covalent compounds have low melting and boiling points?

(iii) Why are covalent compounds either bad or poor conductors of electricity?

Important Questions on Carbon and its Compounds

MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 4 - Carbon and its Compounds>EXERCISE 4A>Q 4
Distinguish between ionic and covalent compounds under the following properties:
(i) strength of forces between the constitutional elements.
(ii) solubility of compounds in water.
(iii) electric conduction in substances.
MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 4 - Carbon and its Compounds>EXERCISE 4A>Q 1
 Some information about elements D, E, F, G and H is given below in tabular form :
Element Mass number Atomic number Electronic configuration
D 9 4 2, 2
E 19 9 2, 7
F 23 11 2, 8, 1
G 31 15 2, 8, 5
H 40 18 2, 8, 8

(i) Will the compound formed by E and F have ionic or molecular structure?
(ii) Draw an electron dot diagram of molecule E2 between E and E.
(iii) Which element can form ions with the electronic configuration of noble gas neon?
(iv) Which element can be described as unreactive?
MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 4 - Carbon and its Compounds>EXERCISE 4A>Q 1
Define covalency.
MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 4 - Carbon and its Compounds>EXERCISE 4A>Q 2

Choose from the list below, the substance or substances that have :
(i) Single covalent bond only
(ii) Double covalent bond only
(iii) Single and double covalent bonds
(iv) Triple covalent bond only
(v) Single and triple covalent bonds
List :

Cl2, H2O, C2H6, O2, C2H4, N2, C2H2

MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 4 - Carbon and its Compounds>EXERCISE 4A>Q 3
Classify the following as ionic or covalent compounds :
(i) Hydrogen chloride,
(ii) Sodium chloride,
(iii) Sodium sulphide
(iv) Carbon tetrachloride
(v) Glucose (vi) Methane
(vii) Magnesium oxide
(viii) Magnesium sulphide
(ix) Urea.
(x) Water
MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 4 - Carbon and its Compounds>EXERCISE 4B>Q 1
Organic compounds having the same molecular formula, but different structural formulae are called-
EASY
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 4 - Carbon and its Compounds>EXERCISE 4B>Q 2

The members of same class of organic compounds when arranged in the order of ascending molecular mass, such that they differ from each other by -CH2 group are called :

MEDIUM
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 4 - Carbon and its Compounds>EXERCISE 4B>Q 3
Amongst aC4H10, bC3H8, cC5H12 and dC5H10 the homologues are: