Page 1 - 4. HOME ASSIGNMENT-(CH-2-WASHING SODA & PLASTER OF PARIS)
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SAI International School
                                                       Class-X

                                               Subject_ Chemistry
                                          Topic- Acids, Bases & Salts
                               Sub Topic- Study of Salts – 4. Washing Soda

                                                                              5. Plaster of Paris
                                               HOME ASSIGNMENT
               OBJECTIVE:
               MCQs
                 Q.1
                       When aqueous sodium carbonate (Na2CO3) reacts with HCl(aq), it gives
                                 (a) NaOH, H2(g) and CO2(g)
                                 (b) NaCl, H2O and CO2(g)
                                 (c) NaHCO3 , H2(g) and CO2(g)
                                            (d) NaHCO3 , H2O and CO2(g)

                 Q.2   Plaster of pairs is made from-
                       (a) lime stone  (b) slaked lime  (c) quick lime   (d) gypsum
                 Q.3
                       Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which
                       of the following statements are true about the gas evolved?

                       (i)  It turns lime water milky

                       (ii)  It extinguishes a burning splinter

                       (iii) It dissolves in a solution of sodium hydroxide

                       (iv) It has a pungent odour

                       (a) (i) and (ii)

                       (b) (i), (ii) and (iii)

                       (c) (ii), (iii) and (iv)

                       (d) (i) and (iv)


                    ➢  For Assertion& Reason question follow the following directions.
                 DIRECTION:   Each of these questions contains an Assertion followed by Reason.
                 Read them carefully and answer the question on the basis of following options.
                 You have to select the one that best describes the two statements.
                 (a) If both Assertion and Reason are correct and Reason is the correct explanation
                 of Assertion.
                 (b) If both Assertion and Reason are correct, but Reason is not the correct
                 explanation of Assertion.
                 (c) If Assertion is correct but Reason is incorrect.

                 (d) If Assertion is incorrect but Reason is correct.
                 (e) If Assertion & Reason both are incorrect.

                 Q.4  Assertion : Plaster of Paris is used by doctors by setting fractured bones.


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