Question

(i) Define the following with one example each (3 x 2 = 6)

(a) Direct combination (b) Decomposition reaction (c) Double decomposition reaction

(ii) Name or state the following with reference to the elements of the first three periods of

the periodic table (4)

(a) The noble gas having an electronic configuration 2,8,8.

(b) A metal in period 3 having valency 3

(c) A non-metal in period 2 which is tetravalent

(d) The periods which contain the inner transition elements.

SECTION B

Question No:5

(i) Differentiate between the following: (3)

(a) Octet and Duplet rule

(b) Lone pair and Bond pair

(c) Atomic number and Mass number

(ii) Write the main postulates Rutherford’s atomic model? (2)

(iii) Write the two properties of Cathode rays ? (2)

(iv) Draw the atomic orbit structure of carbon tetrachloride and state the type of bond

present in it. (2)

(v) Draw the atomic structure to show the formation of ammonia (1) .

Question No:6

(i) Complete the table using correct salt / formula (5)

SALTS FORMULA

1. Washing soda 1. ?

2. ? 2.Na2SO4.10H20

3. Gypsum salt 3.?

4. Green vitriol 4.?

5. ? 5.NaCl

(ii) differentiate between 1. exothermic and endothermic reaction (4)

2. photochemical and electrochemical reaction

3. Synthesis and precipitation

4. oxidation and reduction

(iii) Calculate the relative molecular mass of the following (1)


please help me​

Answer 1

Answer:

sorry i have no idea