Q1. Calcium hydroxide is written as:
Q2. Which of the following is an acid?
Q3. Which indicator works by smell change?
Q4. Acids and bases neutralise each other because:
Q5. Magnesium hydroxide is represented as:
Q6. Acids and bases cancel each other’s effect by the process of:
Q7. Which substance is used as an olfactory indicator?
Q8. The colour of neutral litmus solution is:
Q9. Acids generally have:
Q10. Indicators tell whether a substance is acidic or basic by:
Q11. Litmus is a:
Q12. Bitter taste in food is due to the presence of:
Q13. Clove oil can act as a/an:
Q14. Natural substances that indicate acids or bases are called:
Q15. Litmus solution is naturally:
Q16. Red litmus paper turns blue in:
Q17. The cloth strips soaked with onion are used to test:
Q18. Which indicator is purple in neutral solution?
Q19. Litmus solution is extracted from:
Q20. Distilled water is:
Q21. Lichen belongs to the division:
Q22. Onion smell disappears in:
Q23. Ammonium hydroxide has the formula:
Q24. Which flower petals can act as natural indicators?
Q25. A curry stain turns reddish-brown when scrubbed with soap because soap is:
Q26. Which of the following is the correct remedy for acidity after overeating?
Q27. Which of the following is a base?
Q28. If red litmus shows no change, the solution may be:
Q29. Sour taste in food is due to the presence of:
Q30. Baking soda solution is used as a remedy because it is:
Q31. Substances whose odour changes in acidic or basic media are called:
Q32. Bases change red litmus to:
Q33. The smell of vanilla essence disappears in:
Q34. To test acids and bases in lab, substances are placed on:
Q35. Indicators help us identify whether a substance is:
Q36. Turmeric is an example of a:
Q37. Phenolphthalein remains colourless in:
Q38. Which is NOT an indicator?
Q39. Red cabbage leaves can act as:
Q40. Neutralisation is useful in treating:
Q41. Bases generally have:
Q42. Another synthetic indicator used to test acids and bases is:
Q43. Which of the following is a synthetic indicator?
Q44. Onion strips are stored overnight in a fridge to:
Q45. Acetic acid is represented by the formula:
Q46. Soap is basic in nature because it:
Q47. Methyl orange turns red in:
Q48. The reddish-brown turmeric stain turns yellow again after washing with water because:
Q49. Onion can be used as a:
Q50. Acids change blue litmus to: