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
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