Question Text
Question 1 :
Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are ___.
Question 3 :
What is used to test whether a substance is acidic or basic?
Question 4 :
The correct way of making a solution of acid in water is to ___.
Question 9 :
Name a natural indicator which gives pink colour in basic solution.
Question 10 :
A compound if acidic will turn all indicators red. True or False?
Question 11 :
‘Litmus’, a natural dye is an extract of which of the following?
Question 12 :
Look at the given reaction. $Hydrochloric acid + Sodium hydroxide (base) \rightarrow Sodium chloride (salt) + Water$. Sodium chloride formed in this reaction remains in solution form. Can we get solid sodium chloride from this solution? Suggest a method (if any).
Question 15 :
Name the solution which does not change the colour of either
red or blue litmus.
Question 17 :
Calamine can be used to treat ant’s sting. True or False?
Question 20 :
Common salt dissolved in water turns blue litmus red. True or False?