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Answer:

The answer is (a) because oxalic acid is a weak acid with low ph 4 to 4.2 hence it will turn the blue litmus red while sodium carbonate is a strong base having ph 14 hence it turned the red litmus paper blue..

When a pH strip is dipped in each bottle, the color shown by bottle A and B will be respectively:

(a) blue, orange

• Oxalic acid (A) is acidic and sodium carbonate solution (B) is basic. An acidic solution has a pH less than 7 and basic solution has a pH greater than 7.
• The pH strip will change color to indicate the pH of the solution.
• The color blue is usually associated with basic solutions, and the color orange is usually associated with acidic solutions, so when the pH strip is dipped in bottle A (Oxalic acid) it will turn orange and when dipped in bottle B (Sodium Carbonate solution) it will turn blue.

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