Question

SECTION B (40 marks)

(Attempt any 4 questions)

Question 2: Differentiate between the following: [2 X 5 = 10]

i. Mono acidic base and Mono basic acid

ii. Double salt and Complex salt

iii. Relative atomic mass and Relative molecular mass

iv. Electrovalent bond and covalent bond

v. Modern periodic law and Mendeleev’s periodic law



Question 3: Name the following: [10]

i. Two metals that can form bases when treated with water.

ii. Strong acid containing chlorine.

iii. A dibasic acid containing sulphur.

iv. Mono basic acid containing nitrogen.

v. Acid anhydride of sulphuric acid.

vi. Product obtained when lime water is dried up.

vii. A non polar covalent compound formed from two dissimilar atoms.

viii. A polar covalent compound formed from two dissimilar atoms.

ix. Bridge elements belong to which period of periodic table.

x. Number of elements in period three of modern periodic table.

Question 4:

a. A compound of carbon, hydrogen, and oxygen is found to contain 40% of carbon, 6.7% of hydrogen and 53.3% of oxygen. Calculate its empirical formula. If its vapour density is 30, calculate the molecular formula. [5]

b. Describe the law that governs about number of molecules of gases. [2]

c. What is a coordinate bond? Explain the electron dot structure of one compound which has at least one coordinate bond in it. [3]

Question 5:

Explain the formation of following molecules with the help of its orbit structure: [2X5=10]

i. Methane

ii. Magnesium Chloride

iii. Carbon tetra chloride

iv. Ammonium ion

Question 6:

a. Atomic numbers of six elements A,B,C,D,E, and F are given below: [5]

Element Atomic number

A 10

B 11

C 17

D 13

E 16

F 20



Which element will form an ion having-

i. One unit negative charge

ii. Three unit positive charge

iii. Two unit positive charge

iv. Two unit negative charge

v. Having no charge at all

b. Complete the following equation worksheet: [2.5 X 2 =5]

i. NaCl  + 

At Cathode: Na+ +   

At Anode: Cl     +   

ii. H2SO4 ⇋  + 

H2O ⇋   

At Cathode: H+ +   

H + H 

At Anode: OH    

4OH   + 

Question 7:

a. Give the name and formula of: [5]

i. A strong mono acidic base

ii. A weak mono acidic base

iii. Non volatile acid

iv. Weak dibasic acid

v. Volatile acid



b. State the change of colours in the following cases: [5]

i. A base when react with methyl orange solution

ii. A base when reacts with phenolphthalein solution

iii. An acid when reacts with red litmus solution

iv. A base when reacts with methyl orange solution

vi. An acid when reacts with blue litmus solution​

Answer 1

Answer:

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