Acid, Base & Salt

MCQs: 4

Question: 31. What happens when a base is added to vanilla?

1. Color of vanilla changes into red
2. Vanilla becomes colorless
3. Vanilla loses its smell
4. Nothing happens

Answer: (c) Vanilla loses its smell

Question: 32. What happens when an acid is added to vanilla?

1. Color of vanilla changes into red
2. Vanilla becomes colorless
3. Vanilla loses its smell
4. Nothing happens

Answer: (d) Nothing happens

Question: 33. What is the original color of phenolphthalein solution which is an indicator?

1. Colorless
2. Red
3. Pink
4. Violet

Answer: (a) Colorless

Question: 34. Phenolphthalein exhibits which color with a base?

1. Remains colorless
2. Pink
3. Red
4. Green

Answer: (b) Pink

Question: 35. Phenolphthalein exhibits which color with an acid?

1. Remains colorless
2. Pink
3. Red
4. Green

Answer: (a) Remains colorless

Question: 36. Methyl orange which is an indicator turns into which color with an acid?

1. Red
2. Yellow
3. Pink
4. No color

Answer: (a) Red

Question: 37. Methyl orange which is an indicator turns into which color with a base?

1. Red
2. Yellow
3. Pink
4. No color

Answer: (b) Yellow

Question: 38. What the original color of methyl orange solution which is an indicator?

1. Yellow
2. Orange
3. Pink
4. Red

Answer: Orange

Question: 39. Which of the following compound is formed when zinc reacts with hydrochloric acid?

1. Zinc sulphate
2. Zinc chloride
3. Zinc carbonate
4. Zinc hydroxide

Answer: (b) Zinc chloride

Question: 40. Which of the following compound is formed when zinc reacts with sodium hydroxide?

1. Zinc hydroxide
2. Sodium zincate
3. Zinc hydrogenate
4. No reaction takes place

Answer: (b) Sodium zincate