Question

Anyone plz ask any difficult question from the practical based questions for sci board exam class X

Answer 1

hey what you're saying

Answer 2

1. A student adds a spoon full of powdered sodium hydrogen carbonate to a flask containing ethanoic acid. List two main observations that he/she must note in his/her notebook about the reaction that takes place. Also, write chemical equation for the reaction
2. Mention the essential material (chemicals) to prepare soap in the laboratory. Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of saponification reaction.
3. . A student focuses the image of a candle flame, placed at about 2 m from a convex lens of focal length 10 cm, on a screen. After that he moves gradually the flame towards the lens and each time focuses its image on the screen.
4. . A student dropped few pieces of marble in dilute hydrochloric acid contained in a test tube. The evolved gas was then passed through lime water. What change would be observed in lime water? Write balanced chemical equation for both the change observed?
5. What happens when ethanol is heated with acidified potassium dichromate solution? Write the chemical equation.
6. 5% alkaline potassium permanganate solution is added drop by drop in a test tube containing warm ethanol. Write your observation and chemical equation of the reaction taking place.

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