Effect on Indicators by Acids, Bases

Q.

What is an indicator?

Q.

What is an acid base Indicator?

Q.

What is an indicator?

Q.

When blue litmus paper was dipped into the water, the colour of litmus paper remained the same. Similarly, when red litmus paper was dipped into water, the colour remained the same. By above observation we can concluded that:

1. Water is acidic

2. Water is basic

3. Water is neither acidic nor basic

4. No conclusion can be made

Q.

Identify the properties of a base

1. Sour, ablitity to change colors in an indicator, shiny.

2. Slippery, shiny, bitter.

3. Bitter, ablitity to change colors in an indicator, and slippery.

4. Shiny, ablitity to change colors in an indicator, and slippery.

Q.

Substances that are used to determine whether a particular substance is an acid or a base are called ___.

Q.

Identify the properties of a base

1. Bitter, ablitity to change colors in an indicator, and slippery.

2. Slippery, shiny, bitter.

3. Sour, ablitity to change colors in an indicator, shiny.

4. Shiny, ablitity to change colors in an indicator, and slippery.

Q. Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution.

1. True
2. False

Q. In what condition do vanilla, onion and clove lose their smell?

1. Acidic
2. Basic
3. Neutral
4. Never

Q.

What are pH indicators?

1. Aqueous solution of either salts of strong acids or strong bases.

2. Aqueous solution either salts of weak acids or weak bases.

3. Aqueous solution of either weak acids or weak bases.

4. Aqueous solution of either strong acids or strong bases.

Q.

Acids change the colour of blue litmus to:

1. Stays blue

2. Red

3. Black

4. Blueish black

Q.

Which of the following are used as an indicator for identifying acids and bases:

1. Litmus paper

2. Tumeric

3. Methyl orange

4. All are examples of indicators.

Q.

Vanilla, clove and onion are __ indicators.

Q. Which of the following is true about anthocyanin pigments in red cabbage and rose petals?

1. They can't be used as indicators.
2. They are blue in acidic and red in basic solutions.
3. They are made artificially.
4. They can act as indicators.

Q.

If a blue litmus paper remains blue after dipping into a solution, then that:

1. Solution is acidic

2. Solution is basic

3. Solution is neither acidic nor basic

4. Solution is either basic or neutral.