Litmus Action on Substances

Q.

Ammonia is found in many household products, such as window cleaners. It turns red litmus to blue. What is its nature?

1. Acidic

2. Neutral

3. Basic

4. Can't say

Q.

Methyl orange is a natural indicator.

1. True

2. False

Q.

Litmus, a natural dye is an extract of which of the following?

1. China rose

2. Beetroot

3. Lichen

4. Blueberries

Q.

Is litmus a natural indicator?

Q.

Beetroot turns ___ when dipped inside a basic solution.

Q.

Nitric acid turns red litmus solution blue.

1. True

2. False

Q.

Why litmus paper consider as a indicator?

Q.

What is a litmus paper? What would happen when a red litmus paper is treated with a solution containing NaOH? [2 MARKS]

Q.

What happens to blue litmus paper when you put it in vinegar?

1. Blue litmus paper turns red.

2. Blue litmus paper turns black.

3. No change will occur.

4. Blue litmus paper turns dark blue.

Q.

If the given solution turns blue litmus paper red, then the solution is

1. acidic

2. basic

3. neutral

4. red

Q. Name three plants from which indicators can be prepared.

Q.

‘Litmus’, a natural dye is an extract of which of the following?

1. China rose (Gudhal)

2. Beetroot

3. Lichen

4. Blueberries (Jamun)

Q.

Acid-base Indicators are substances which show whether the substance is basic or acidic.

1. True

2. False

Q. Turmeric strip do not show any color change in acid. So how we would know that the given substance is acid or neutral

Q.

Acids have no effect on red litmus.

Say True or False.

1. True

2. False

Q.

Question 6

Litmus, a natural dye is an extract of which of the following?
(a) China rose (Gudhal)
(b) Beetroot
(c) Lichen
(d) Blueberries (Jamun)

Q.

Which of the following has no effect on red litmus?

1. Salt

2. Acid

3. Base

4. Can’t be said

Q.

Which of the following substance turns blue litmus red?

1. Acid

2. Salt

3. Base

4. Can’t be said

Q.

Is the distilled water acidic, basic or neutral? How would you verify it? [3 MARKS]

Q. 1. Name the substance that undergoes chemical change.
2. Toilet cleaners use which of the following property of acids?
3. Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature? [3 MARKS]

Q. <!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> (a) Name one indicator which turns red on adding an acid.
(b) Name one indicator which turns red on adding a base.

Q. Identify us.
"I convert blue litmus into red."
"I convert red litmus into blue."
"I do not change colour of any litmus."

1. Vinegar, Salt, Toothpaste
2. Vinegar, Toothpaste, Salt
3. Salt, Vinegar, Toothpaste
4. Toothpaste, Vinegar, Salt

Q. Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?

Q. solutions turn red litmus blue.

1. Acidic
2. Basic
3. Neutral

Q.

Answer the following questions:
(a) Name three acids used in the laboratory.

(b) Name one indicator that turns red on adding a base.

(c) Write the name of two indicators that occur naturally.

Q. Litmus is naturally extracted from _____.

1. Virus

2. Bacteria

3. Lichen

4. Fungus

Q. The nature of solution which turns blue litmus paper red is ......... .

1. acidic
2. basic
3. neutral
4. none of these

Q.

A strong acid has the following characteristics-

1. 
   

   Completely gets ionized in water

2. 
   

   Partially gets ionized in water

3. 
   

   Do not get ionized in water

4. 
   

   All the these

Q. Write True (T) or False (F) against the following statements in the given brackets:
1. Acids corrode metals. ( )
2. Distilled water is a neutral substance. ( )
3. Sodium hydroxide turns blue litmus red. ( )
4. The stings of bees contain an acid. ( )
5. Milk of magnesia is used in antacids. ( )

Q. Litmus papers are available in _____ and ______ colours.

1. red, pink
2. blue, black
3. blue, pink
4. red, blue