MEDIUM
7th CBSE
IMPORTANT
Earn 100
The substance which can turn blue litmus to red is:
50% studentsanswered this correctly
Important Questions on Acids, Bases and Salts
MEDIUM
7th CBSE
IMPORTANT
A yellow stain of turmeric containing curry on a white shirt turns red when soap solution is scrubbed on it. This shows that soap solution is:
MEDIUM
7th CBSE
IMPORTANT
A certain solution does not change the colour of any indicator. This solution is most likely to be:
MEDIUM
7th CBSE
IMPORTANT
Which of the following does not cause acid rain?
MEDIUM
7th CBSE
IMPORTANT
Which of the following is a mineral acid?
EASY
7th CBSE
IMPORTANT
Which indicator will produce a pink colour on adding a few drops of sodium hydroxide solution?
HARD
7th CBSE
IMPORTANT
Consider the following salts :
Sodium sulphate, Sodium carbonate, Ammonium sulphate
The aqueous solution of which of these salts will :
(a) turn blue litmus to red?
(b) turn phenolphthalein to pink?
(c) turn China rose indicator to green?
(d) have no effect on any indicator?
Give reasons for your answer in each case.
MEDIUM
7th CBSE
IMPORTANT
Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
HARD
7th CBSE
IMPORTANT
If someone is suffering from the problem of acidity after overeating, which of the following would you suggest as remedy?
Lemon juice, Vinegar, Baking soda solution
Give a reason for your choice.
