Chemistry Paper Class:I X

 CAMPUS: ______________
Name: ____________________ Date: _____________________
Paper: Chemistry Class: IX
Total Marks: 12 Marks Obtained: _______ Time: 15 minutes


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Obtained Marks: _________________ Teacher’s signature: _________________



Time: 2 hrs Total Marks: 60
Name: _____________                      Date: ___________
Subject: Chemistry Class:  10th
Questions
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Marks Obtained





Note:
You have four choices for each objective type question as A, B, C, and D. The choice which you think is correct; fill that box in front of that question number. Use marker or pen to fill the box. Cutting or filling two or more boxes will result in zero in that question.
Objective
Time Allowed: 15 mins Total Marks: 12
Q.1 Questions (A) (B) (C) (D)
__________ is called the equilibrium constant. Kc CO both a and b none of these
When calcium oxide and Calcium dioxide react they produce ___________. calcium suplphide calcium calcium carbonate none of these
Reaction from left to right is __________ reaction. reversible irreversible backward forward
Kc = _______________ dm2 mol-1 dm3 mol-1 dm2 mol-2 dm2 mol-3
NH4+ is called __________ acid of NH3. week strong conjugate all of these
Lower the pH value __________ will be the acid. weaker stronger neutral alkaline
Naphthalene is a/an __________ compound. organic inorganic neutral none of these
C4H10 is a molecular formula of: methane propane n-butane butane
Thiophene is an example of: aromatic compound non-cyclic compound cyclic compound all of these
Effect of acid on blue litmus paper is: turns red turns yellow turns pink no effect
Deficiency of vitamin E causes: rickets scurvy anemia in babies night blindness
Photosynthesis process produces: starch cellulose sucrose glucose
























Subjective Part-I
Time Allowed: 1 hr : 45 min Total Marks: 48
Q.2 Answer any five parts from the following. (2x5=10)
Give the general formula of lipids.
How are proteins formed?
Why hydrocarbons are soluble in organic solvents?
Why the alkanes are used as fuel?
How is coal formed?
Write classification of coal.
What is auto-ionization of water?
Define a salt.
Q.3 Answer any five parts from the following. (2x5=10)
Explain why H3PO4 form three series of salts?
Give four uses of calcium-oxide.
Define the term ‘pH’.
Which type of bond forms between Lewis acid and a base?
Why a salt is neutral. Explain with an example.
How are the soluble salts recovered from water?
Why at equilibrium state reaction does not stop?
Define chemical equilibrium state.
Q.4 Answer any five parts from the following. (2x5=10)
What is relationship between active mass and rate of reaction?
Give the characteristics of reversible reaction.
How direction of a reaction can be predicted?
Why H+ ion acts as Lewis acid?
How are alkyl halides reduced?
What are the addition reactions?
Why colour of bromine water discharges on addition of ethene in it?
State one important use of Acetylene and Chloroform.




Subjective Part-II
Note: Attempt any two questions. (9x2=18)
Q.5. (a) Explain the oxidation of acetylene.         (5)
 (b) Explain briefly ‘there are millions of organic compounds’.         (4)
Q.6. (a) Explain the sources and uses of proteins.         (5)
 (b) Give the importance of vitamins.                 (4)
Q.7. (a) Define acid rain. How it forms and what are its effects?         (5)
 (b) State the characteristics of stratosphere.         (4)


















Answer Key
Q.1. Select the best option and circle it.
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