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    Exploring

                                                                           Substances: Acidic,

                                     2                                     Basic, and Neutral

                                               computational thinking quest

                    Tick ( ) the correct option.
                      1.  A student  observes  that  a liquid  turns blue        What do the red colour in test tube A and the
                         litmus paper red. Without knowing its name,          green colour in test tube B indicate?
                         how should the student classify it?                                          (Abstract Thinking)
                                                  (Abstract Thinking)
                                                                                    (a)  B is an acid and A is a base.
                                (a)  Base           (b)  Neutral
                                                                                    (b)  A is an acid and B is a base.

                                (c)  Acid           (d)  Salt
                                                                                    (c)  Both A and B are acids.
                      2.  If  a substance  shows no change with any
                         indicator, what can we conclude?                           (d)  Both A and B are bases.
                                                  (Abstract Thinking)      4.  Observe the pattern:

                                (a)  It is acidic.                            Lemon   Acidic
                                                                              Soap   Basic
                                (b)  It is basic.                             Sugar solution   ?    (Pattern Recognition)

                                (c)  It may be neutral.                             (a)  Acidic

                                (d)  It is harmful.                                 (b)  Basic
                      3.  A student  performed  an experiment  to                   (c)  Neutral
                         identify  the  nature  of two  solutions  using  a
                         red rose indicator  and obtained  the  results             (d)  Both acidic and basic
                         shown in the image below.                         5.  Observe the pattern:

                                                                              Lemon juice   Citric acid
                                                                              Vinegar   Acetic acid
                                                                              Curd   X

                                      A           B                           What does 'X' represents?
                                                                                                     (Pattern Recognition)

                                                                                    (a)  Oxalic acid     (b)  Tartaric acid

                                                                                    (c)  Lactic acid     (d)  Citric acid

                                                                        Exploring Substances: Acidic, Basic, and Neutral  59

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