During electrolysis of water a few drops of sulphuric acid is added into water. Why?
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A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains
(d) starch,is the correct option.
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Why is it necessary to use acetic acid and not sulphuric acid for acidification of sodium
Although the addition of sulphuric acid will precipitate lead sulphate, the addition of acetic acid will ensure a complete precipitation of sulphur in the form of lead sulphate due to...
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Why can't we prepare HBr by heating KBr with sulphuric acid ?
[Hint : As HBr readily reduces H2SO4 forming Br2.]
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If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done
The hand is washed immediately with plenty of water an a paste of sodium hydrogencarbonate (a base) is applied to neutralise the acid.
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Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then small amount of
(c) both physical change.
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A student adds a few drops of ethanoic acid to test tubes X, Y and Z containing aqueous solutions of sodium chloride,
The correct answer is (D) only Z
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If you add a few drops of acetic acid to a test tube containing (i) distillated water and
No reaction with distilled water. Chemical reaction occurs with solution of NaHCO3 Two Observations: (i) Evolution of a colourless, odourless gas. (ii) The gas is evolved with brisk effervescence
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When a few drops of phenolphthalein are added to a dilute solution of sodium hydroxide,
When excess of HCl is added, the colour of the final mixture will be colourless because the pink colour of sodium hydroxide is neutralised with the acid.
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What do you observe when you add a few drops of acetic acid to a test tube containing:
(i) Acetic acid will remain colourless in phenolphthalein. 22. (ii) Acetic acid will dissolve in distilled water forming a clear solution. (iii) Universal indicator gives orange colour with acetic acid. (iv) Sodium hydrogencarbonate...
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Jhoolan put a few drops of lemon juice in Jhumpa’s mouth. Do you think we can make our the taste with just a few drops.
Yes. A few drops of sour things like lemon is enough to make out the taste.
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