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Science [2 Mark Questions]

Acids, Bases and Salts · MP Board (MPBSE) STD 10 (Madhya Pradesh - English Medium). 3 questions.

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[2 Mark Questions]

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Question 12 Marks
Name the acid present in ant sting and give its chemical formula. Also give the common method to get relief from the discomfort caused by the ant sting.
Answer
Acid present in ant sting is formic acid which is also named as Methanoic acid.
Chemical formula for formic acid is HCOOH.
It is acidic in nature, so an alkaline compound like wet baking soda can be used to neutralize its effect to get relief from discomfort.
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Question 22 Marks
A student prepared solutions of (i) an acid and (ii) a base in two separate beakers. She forgot to label the solutions and litmus paper is not available in the laboratory. Since both the solutions are colourless, how will she distinguish between the two?
Answer
Add phenolphthalein to a portion of each solution in separate test tube. If it turns pink, the beaker contains base whereas if it remains colourless, it is an acid.
If phenolphthalein is not available, pH paper can be used. Acid will turn pH paper red base will turn pH paper blue.
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Question 32 Marks
What will be the action of the following substances on litmus paper? Dry HCl gas, Moistened $NH_3$ gas, Lemon juice, Carbonated soft drink, Curd, Soap solution.
Answer
Dry HCl gas will not have any effect on litmus paper. Moistened $NH_3$ gas will turn red litmus blue. Curd, lemon juice, carbonated soft drink will turn blue litmus red. Soap solution will turn red litmus blue.
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[2 Mark Questions] - Science STD 10 Questions - Vidyadip