Synthetic Indicators

Q.

What are synthetic indicators? Give two examples of synthetic indicators.

Q.

You are provided with four test tubes containing sugar solution, baking soda solution, tamarind solution, salt solution. Write down activity to find nature (acidic/basic/neutral) of each solution.

Q. Choose the incorrect statement about acids.

1. They give $H^{+}$ ions in water.
2. They turn blue litmus paper red.
3. They give pink colour with phenolphthalein.
4. They are sour in taste.

Q.

What will be the colour change when methyl orange is added to sodium hydroxide?

1. Blue

2. Yellow

3. Pink

4. Green

Q.

What are synthetic indicators? Give two examples of synthetic indicators.

Q. <!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Between phenolphthalein and methyl orange, which will not indicate acids?

Q. What is the effect of potassium hydroxide solution on litmus paper?

1. Turns blue litmus to green
2. Turns blue litmus to red
3. Turns red litmus to green
4. Turns red litmus to blue

Q. What will be the colour change when methyl orange is added to sodium hydroxide?

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

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

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

Q. Methyl red turns _____ in basic solution.

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

Q.

Which of the following is a laboratory indicator?

1. Turmeric

2. Phenolphthalein

3. Hibiscus

4. Red cabbage

Q. Methyl orange turns _____ colour in basic solution.

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

Q. Methyl orange turns _____ colour in basic solution.

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

Q. Which of the following indicator gives pink colour in a basic solution?

1. Methyl orange
2. Turmeric
3. Phenolphthalein
4. Litmus paper

Q. What is the effect of potassium hydroxide solution on litmus paper?

1. Blue litmus to light blue.

2. Blue litmus to red.

3. Red litmus to light pink

4. Red litmus to blue.

Q.

Identify the change in colour, when curd is tested with litmus paper.

1. Red to green

2. Blue to green

3. Blue to red

4. Red to blue