JAWAHAR NAVODAYA VIDYALAYA, अलीराजपुर
                                                             PWT-II ( 2021-22)                              
 CLASS -X                            Sub. - Chemistry(science)              Marks- 14             Time-90min.              
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Q.1. What happens when a solution of an acid is mixed with a solution of a base in a test tube? (i) Temperature of the solution decreases(ii) Temperature of the solution increases(iii) Temperature of the solution remains the same(iv) Salt formation takes place
1 point
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Q.2 . __________is a natural indicator *
1 point
Q.3.  Lemmon  is a natural source of which acid? *
1 point
Q.4. Sodium hydroxide turns phenolphthalein solution *
1 point
Q.5. Zinc granules on treating with an acid X, form the zinc sulphate (ZnSO4) salt along with the evolution of a gas Y which burns with a pop sound when brought near to a burning candle. Identify the acid X and gas evolved Y. *
2 points
Q.6. Assertion (A) : HCl gas does not change the colour of dry blue litmus paper. Reason (R) : HCl gas dissolves in the water present in wet litmus paper to form H+ ions. *
1 point
Q7. Assertion (A): Pure water is neither acidic nor basic. Reason (R) :In pure water, the hydrogen ion concentration, [H +] equals to the hydroxide ion concentration, [OH-] *
1 point
Q.8. Assertion (A) : The aqueous solutions of glucose and alcohol do not show acidic character. Reason (R) : Aqueous solutions of glucose and alcohol do not give H+ ions. *
1 point
Q. 9.Reaction of an acid with a base is known as- *
1 point
Q. 10. Match the following Items *
4 points
Base
Ascorbic Acid
Onion
Sulphuric Acid
Olfactory indicators
Organic Acid
Inorganic Acid/Mineral Acids
Bathing Soap made up of
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