HARD
7th Foundation
IMPORTANT
Earn 100

Ishaan tested the nature of a few common substances with different indicators and recorded his observations as follows:

Substance P turned methyl orange yellow.

Substance Q turned phenolphthalein colourless.

Substance R did not have any effect on blue or red litmus.

Substance S turned China rose indicator green.

P, Q, R and S could be respectively.

50% studentsanswered this correctly

Important Questions on Acids, Bases and Salts

HARD
7th Foundation
IMPORTANT

A science teacher has arranged the following sets of test tubes as follows. 

Question Image
She asked the students to find out the incorrect statement about the above experimental set-up.

HARD
7th Foundation
IMPORTANT

Consider the following statements (l-l V) and fill in the blanks by selecting the appropriate option.
I. An antacid such as P is used to cure indigestion.
II. Lime water contains Q , which turns milky with carbon dioxide.
III. Soap solution is basic due to the presence of R. It turns the turmeric stain of the shirt to red.
IV. Baking soda is S which reacts with vinegar to evolve carbon dioxide gas.

  P Q R S
(A) Milk of magnesia Calcium hydroxide Sodium hydroxide Sodium hydrogen carbonate
(B) Calcium hydroxide Milk of magnesia Sodium hydroxide Sodium hydrogen carbonate
(C) Sodium hydroxide Sodium hydrogen carbonate Calcium hydroxide Milk of magnesia
(D) Sodium hydrogen carbonate Calcium hydroxide Milk of magnesia Sodium hydroxide