Four students I, II, III and IV were asked to examine the changes for blue and red litmus paper strips with dil. HCl (Solution A) and dil. NaOH (Solutions). The following observations were reported by the 4 students. The sign …………. indicates no colour change
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HCL is acid so blue litmus will change Blue to red
NaOH is base so it will change red to blue
Explanation:
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