CHEMISTRY PAPER 10TH CLASS 2018 SARGODHA BOARD GROUP 1

CHEMISTRY PAPER 10TH CLASS 2018 SARGODHA BOARD GROUP 1 OBJECTIVE

CHEMISTRY	Sargodha Board 2018	GROUP 1
Maximum Marks: 12	OBJECTIVE TYPE	Time Allowed: 15 Minute

Q.1. (A) Choose the correct option from the columns A, B, C and D and fill up the bubbles: 12

1.      Potable water on earth is only ____ of total water.
0.6%	0.2%	4.0%	2.1%
2.      The boiling range of petroleum ether is:
170-250o C	30-80o C	20-170o C	80-170o C
3.      Kc is always equal to:
Kf/Kr	Kr/Kf	Rf/Rr	Kf/Kf
4.      The given reaction goes to completion because of CaCO3----CaO+CO2
High temperature	CaO is more stable than CaCO3	CO2 escapes continuously	CaO is not dissociated
5.      KCI is an example of
Double salt	Normal salt	Mixed salt	Complex salt
6.      pH of neutral solution is:
6	7	8	14
7.      Amount of carbon in anthracite coal is:
60%	70%	80%	90%
8.      Which one of the following is an unsaturated hydrocarbons?
CH4	C2H6	C2H4	C3H8
9.      Water soluble vitamin is:
Vitamin B	Vitamin A	Vitamin D	Vitamin E
10.  The formula of stearic acid is:
C17H35COOH	C17H33COOH	C17H37COOH	C17H31COOH
11.  Which gas protects the earth’s surface from ultraviolet radiations?
CO2	CO	N2	O3
12.  Which disease causes severe diarrhea and can be fatal.
Jaundice	Cholera	Typhoid	Hepatitis

CHEMISTRY PAPER 10TH CLASS 2018 SARGODHA BOARD GROUP 1 SUBJECTIVE

CHEMISTRY	Sargodha Board 2018	Group 1
Maximum Marks: 48	SUBJECTIVE TYPE	Time Allowed: 1.45 hours

SUBJECTIVE TYPE

(PART-1)

Q2. Write short answers to any FIVE (5) questions:                                             (5x2=10)

(i)           Define reversible reaction and given an example.

(ii)         What is relationship between active mass and rate of reaction?

(iii)       How can we predict the direction of a reversible reaction?

(iv)       Differentiate between reactants and products.

(v)         Define pH. What is the pH of pure water?

(vi)       Write down two uses of sodium chloride.

(vii)     Write the chemical formula of Mohr’s salt.

(viii)   Describe Bronsted Lowry concept of acids and bases.

Q3. Write short answers to any FIVE (5) questions:                                             (5x2=10)

(i)           Define aromatic compounds, give example.

(ii)         Give two uses of coke.

(iii)       How are alkyl radicals formed? Give example.

(iv)       What are addition reactions? Give example.

(v)         Write down the formula of oxalic acid.

(vi)       Define carbohydrates.

(vii)     Give the general formula of amino acids.

(viii)   Write down the sources of vitamin A.

Q4. Write short answers to any FIVE (5) questions:                                             (5x2=10)

(i)        Write two effects of SO₂.

(ii)         Define pollutants. Give two example of air pollutants.

(iii)       Define ozone and ozone hole.

(iv)       Write the cause and effect of fluorosis.

(v)         How temporary hardness is removed by boiling?

(vi)       Write two uses of petroleum ether.

(vii)     How granulation of liquid urea is done?

(viii)   Define minerals and gangue.

(PART-1I)

Note: Attempt any TWO questions.                                                                        (2x9=18)

Q5.      (a)        State the law of mass action and derive equilibrium constant expression for a general reaction.

            (b)       What is salt? Explain with examples the following salts.

(i) Double salts           (ii) Complex Salts

Q6.      (a)        Write five sources of alkanes.

            (b)       Write note on oligosaccharides and polysaccharides.

Q7.      (a)        Write down the procedure for manufacturing of sodium carbonate by Solvay’s process.

            (b)       Write two methods for removal of temporary hardness of water.