Back to: MBOSE Science Class 7

Name the acid present in lemon and tomato?

The acid present in tomato is acetic acid

Name the base present in soap and lime water?

The base presents in soap are sodium hydrochloride potassium hydroxide. Base present in lime water is calcium hydroxide.

Name the natural indicator other than turmeric?

Turmeric is used in the kitchen for preparing our food is also a natural indicator.  Petrol an acidic solutions other then turmeric.  

Name the acid present in bees sting?

Acid present in bee’s sting is formic acid.

What is the difference between an acid and base?

The difference between an acid and base are as follows.

ACID	BASE
Acid the sour taste of the item is due to the presence of a substance called acid.	The substances which are bitter in taste and Soapy to touch is called a base.

Window cleaners turn red litmus blue, what is its nature?

Neutral nature of distilled water can be verified by the use of blue and red litmus paper.

Write the reaction between Sodium Hydroxide and hydrochloric acid?

The reaction between Sodium Hydroxide and hydrochloric acid is :- HCI + NaOH -> NaCI + H2O

What is an indicator?  Give two examples

The indicators of the substances, that can be found naturally  and can determine whether the substance is an acidic or basic substance by changing the colour of a substance.  Example Litmus and turmeric.

Name two fruits and the acids present in them.

Apple-> malic acid

Oranges-> citric acid.

What is the original colour of methyl orange, China rose and Phenolpholein indicator?

Methyl orange= orange

Phenolpholein = colourless

China rose= light pink