Vardaan Watermark

VARDAAN LEARNING INSTITUTE

Level 0 Worksheet: Acids, Bases & Salts

Class: 10 Science Topic: Basics & Formulae Max. Questions: 50
Name:
Date:
Section A: Indicators & Colors

Q1-10. Complete the table or fill in the blanks:

  1. Blue Litmus turns __________ in Acid.
  2. Red Litmus turns __________ in Base.
  3. Color of Phenolphthalein in Acid is __________.
  4. Color of Phenolphthalein in Base is __________.
  5. Color of Methyl Orange in Acid is __________.
  6. Color of Methyl Orange in Base is __________.
  7. Turmeric solution turns __________ in soap solution.
  8. Litmus is extracted from __________.
  9. Olfactory indicators change their __________ in acidic or basic media.
  10. Vanilla essence smell __________ (remains/vanishes) in NaOH solution.
Section B: Basics & Definitions

Q11-20. Fill in the blanks:

  1. Acids taste __________.
  2. Bases taste __________ and feel __________ to touch.
  3. Water soluble bases are called __________.
  4. Reaction between an Acid and a Base is called __________ reaction.
  5. Metallic oxides are __________ in nature.
  6. Non-metallic oxides are __________ in nature.
  7. All acids contain __________ ion.
  8. All bases contain __________ ion.
  9. Dilution of acid is an __________ (exothermic/endothermic) process.
  10. Curd contains __________ acid.
Section C: Key Reactions

Q21-25. Complete the general word equations:

  1. Acid + Metal $\rightarrow$ Salt + __________
  2. Acid + Metal Carbonate $\rightarrow$ Salt + Water + __________
  3. Acid + Metal Oxide $\rightarrow$ Salt + __________
  4. Base + Non-Metal Oxide $\rightarrow$ Salt + __________
  5. NaOH + HCl $\rightarrow$ __________ + Water
Section D: The pH Scale

Q26-35. Answer briefly:

  1. What is the pH of pure water? __________
  2. Solutions with pH < 7 are __________ (Acidic/Basic).
  3. Solutions with pH > 7 are __________ (Acidic/Basic).
  4. Which is a stronger acid: pH 2 or pH 5? __________
  5. Which is a stronger base: pH 8 or pH 13? __________
  6. Tooth decay starts when pH of mouth falls below __________.
  7. Stinging hair of nettle leaves inject __________ acid.
  8. pH of Acid Rain is less than __________.
  9. Our stomach produces __________ acid to help digestion.
  10. To treat acidity, we use mild bases called __________.
Section E: Common Salts & Formulae

Q36-45. Write the Chemical Formula for:

  1. Common Salt: __________
  2. Caustic Soda: __________
  3. Baking Soda: __________
  4. Washing Soda: __________
  5. Bleaching Powder: __________
  6. Plaster of Paris: __________
  7. Gypsum: __________
  8. Slaked Lime: __________
  9. Quick Lime: __________
  10. Lime Water: __________
Section F: Chemical Names

Q46-50. Write the Chemical Name for:

  1. $NaHCO_3$: __________
  2. $Na_2CO_3 \cdot 10H_2O$: __________
  3. $CaOCl_2$: __________
  4. $CaSO_4 \cdot \frac{1}{2}H_2O$: __________
  5. $CuSO_4 \cdot 5H_2O$: __________