Question

Q3. A white shirt has a yellow stain of curry. When soap is rubbed on this shirt during washing , the yellow stain turns red.
a) Name the natural indicator present in curry stain .
b) What is the nature of the soap ?​

Answer 1

calculate the apparent loss of weight when 150g of marble is heated strongly.b)A white compound A when strongly heated produces a yellow residue B which turns white on cooling. A colourless gas Cis also released which turns freshly prepared lime water milky.

i)Write a balanced chemical equation for the heating of the compound A.

ii)Give a balanced chemical equation when B reacts with sodium hydroxide.

iii)What will you observe when the gas Cis passed in excess through the lime water?

Q3. A white shirt has a yellow stain of curry. When soap is rubbed on this shirt during washing , the yellow stain turns red.

a) Name the natural indicator present in curry stain .

b) What is the nature of the soap ?

Answer 2

Answer:

Hi friend, we know that turmeric is an indicator which changes its yellow colour into reddish brown when come in contact with solution of base.We know that soap solution is base and thus , when turmeric stain is washed with soap a base turns reddish brown.