Litmus

Q.

What is a self indicator?

Q.

An aqueous solution ‘A’ turns phenolphthalein solution pink. In addition of an aqueous solution ‘B’ to ‘A’, the pink color disappears. The following statement is true for solution ‘A’ and ‘B’.

1. A is strongly basic and B is a weak base.

2. A is strongly acidic and B is a weak acid.

3. A has pH greater than 7 and B has pH less than 7.

4. A has pH less than 7 and B has pH greater than 7.

Q. Which of the following substance turns blue litmus red?

1. Base
2. Acid
3. Salt
4. Alkali

Q.

Sodium hydroxide turns blue litmus red.

1. True

2. False

Q.

Q. What happens to blue litmus paper when it is dipped in vinegar?

1. Blue litmus paper turns red

2. Blue litmus paper turns dark blue

3. Blue litmus paper turns black

4. No change will occur

Q. Litmus is naturally extracted from _____.

1. Fungus

2. Virus

3. Bacteria

4. Lichen

Q.

Question 6 (i)
Mark ‘T’ if the statement is true and ‘F’ if it is false:

(i) Nitric acid turn red litmus blue.

Q. A base turns litmus solution .

1. red
2. green
3. yellow
4. blue

Q.

Will Ethanol solution turn blue litmus paper to red? Explain.

Q.

Will Ethanol solution turn red litmus paper blue? Explain.

Q.

What is the effect of an acid on blue litmus, red litmus, and methyl orange?

Q.

What is the source of litmus solution? What colour does it exhibit in acidic and basic solution? [2 MARKS]

Q. Give examples of indicators which are used to check neutralisation.

Q.

Name an acid that is used to preserve pickles and Chinese food?

Q.

Rearrange the jumbled letter to obtain the name of an indicator.

MUSLIT
___

Q.

A few drops of aqueous NaOH are dropped on a pH paper. The color of the pH paper will turn to:

1. blue

2. green

3. yellow

4. violet

Q. If we have reactants vinegar , water, lime juice and boil it what will be the product ? Present it in chemical reaction with chemical symbols.

Q. What is the actual definition of acids.
can you please send the answer in priyam.sarkarmsd @gmail.com
I have tomorrow exam please send fast.😀

Q.

From what source do we obtain litmus solution? [2 MARKS]

Q. Phenolphthalein gives _____ colour in basic medium.

1. Yellow
2. Pink
3. Black
4. Green

Q.

Roshni uses a solution of ammonia and water to clean tiles in the kitchen. What would happen to the cleaning action if vinegar is used in place of water?

1. Improves the cleaning action
2. Reduces the cleaning action
3. No change in the cleaning action
4. Shouldn't be mixed as the product formed is toxic

Q. An acid turns litmus solution .

1. red
2. green
3. yellow
4. blue

Q.

You find a substance that is bitter in taste. When you rubbed its solution on your fingers, it felt soapy. What is this substance most likely? [2 MARKS]

Q. On washing with soap, a turmeric stain on the cloth turns to red because
A. soap solution is alkaline.
B. soap solution is acidic.
C. turmeric contains a natural indicator.
D. turmeric contain litmus.
Select the correct alternative.

1. A and D
2. B and D
3. A and C
4. C and B

Q.

Definition of acid.

Q. Carbon dioxide gas turns moist blue litmus red.

1. True
2. False

Q. Dry ammonia has no action on litmus paper but a solution of ammonia in water turns red litmus paper blue. Why is it so?

Q.

Describe the two color changes which take place when moist Blue litmus is placed in a gas jar of chlorine.

Q.

Question 9

Which of the following set of substances contain acids?
(a) Grapes, lime water
(b) Vinegar, soap
(c) Curd, milk of magnesia
(d) Curd, vinegar