Subject :NSO Class : Class 7
Fill in the blanks by choosing the correct option.Turmeric is one of the most commonly used spices in
our kitchen. It leaves a yellow stain on white clothes.
On rubbing with soap which is p in nature, the yellow
stain changes to q colour. Now, if we pour some
r containing s over this stain, it again becomes
yellow in colour due to t .
| P | Q | R | S | T | |
| A | Alkaline | Red | Lemon juice | Acetic acid | Formation of water |
| B | Acidic | Green | Lime Lime | Sodium hydroxide | Neutralisawatertion reaction |
| C | Neutral | Dark pink | Lime water | Potassium hydroxide | Formation of water |
| D | Alkaline | Red | Lemon juice | Citric acid | Neutralisation reaction |
Ans 1:
Class : Class 7
answer is D ) this is because soap is alkaline in nature so p is alkaline then we can cancel out b or c then basic or alkaline substances turn red when rubbed on turmeric paper. hen they have mentioned in the answer that it has to be lemon juice and it contains citric acid or vitamin c the reaction turns it back to yellow that reaction is known as neutralization reaction