Acid Base & Salt - Class 10th Science

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

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