Which acid gives vinegar its sour taste? a. Citric acid b. Lactic acid c. Acetic acid d. None of these Ans: c
Curd is sour due to the presence of: a. Citric acid b. Lactic acid c. Acetic acid d. Oxalic acid Ans: b
Which acid is commonly known as the ‘King of Chemicals’? a. Hydrochloric acid (HCl) b. Sulphuric acid (H₂SO₄) c. Nitric acid (HNO₃) d. Phosphoric acid (H₃PO₄) Ans: b
What is the chemical formula of acetic acid? a. CH₃COH b. CH₃COOH c. CH₂COOH d. CH₃COCH₃ Ans: b
Which acid is found in grapes? a. Lactic acid b. Formic acid c. Acetic acid d. Tartaric acid Ans: d
Which acid is also called carbolic acid? a. Phenol b. Acetic acid c. Ethanol d. Oxalic acid Ans: a
Blue vitriol is another name for: a. Copper sulphate b. Copper c. Magnesium oxide d. Oxygen Ans: a
Which acid is found in the largest quantity in vinegar? a. Hydrochloric acid b. Sulphuric acid c. Acetic acid d. Nitric acid Ans: c
2. Strength & Classification of Acids and Bases
Which of the following is the strongest acid? a. CF₃COOH b. CH₃COOH c. CBr₃COOH d. CCl₃COOH Ans: a
Which among the following is the strongest acid? a. Acetic acid b. Monochloroacetic acid c. Dichloroacetic acid d. Trichloroacetic acid Ans: d
Sulphuric acid is: a. Monobasic b. Dibasic c. Tribasic d. Tetrabasic Ans: b
Which element is common to all acids? a. Hydrogen b. Oxygen c. Nitrogen d. Sulphur Ans: a
Which of the following substances can displace hydrogen from acids to form salts? a. Phosphorus b. Sodium c. Silver d. Sulphur Ans: b
Choose the acid salt from the following: a. Na₂S b. Na₂SO₃ c. Na₂SO₄ d. NaHSO₃ Ans: d
Ammonium chloride is an acidic salt because it is a salt of: a. Weak acid and weak base b. Weak acid and strong base c. Strong acid and weak base d. Strong acid and strong base Ans: c
3. Indicators, Reactions & Chemical Behavior
Acids turn __________ litmus __________. a. Red to blue b. Green to yellow c. Yellow to green d. Blue to red Ans: d
When vinegar reacts with baking soda, the gas released is: a. Copper b. Carbon dioxide c. Copper sulphate d. Magnesium oxide Ans: b
Which base is present in washing soda solution? a. It is acidic b. Neutral c. Bleaching d. Alkaline Ans: d
The chemical formula of sulfurous acid is: a. H₂SO₄ b. H₂SO₃ c. H₃SO₄ d. H₃SO₃ Ans: b
Which of the following is incorrect about acids? a. They give H⁺ ions in aqueous solution b. Most acids contain hydrogen c. They turn litmus red d. They are poor conductors of electricity in aqueous solution Ans: d
Which of the following metal behaves as a non-metal with concentrated nitric acid? a. Copper (Cu) b. Iron (Fe) c. Tin (Sn) d. Lead (Pb) Ans: c
The yellowing of skin by concentrated nitric acid is due to: a. Conversion of proteins to xanthoproteins b. Dehydration effect of HNO₃ c. Formation of nitrocellulose d. Oxidation reaction Ans: a
When copper sulphate reacts with iron, the products formed are: a. Vinegar and iron sulphate b. Ash and iron c. Iron sulphate and copper d. Baking soda and iron Ans: c
Crystallisation is an example of: a. Physical change b. Chemical change c. Chemical reaction d. Galvanization Ans: a
Concentrated nitric acid is stored in containers made of: a. Copper b. Zinc c. Aluminium d. Silicon Ans: c
4. Special Reactions & pH Concepts
The pH of pure water at 25°C is 7. What happens to pH when the water is heated to 100°C? a. Increases b. Decreases c. Remains the same d. First decreases then increases Ans: b
A solution with pH = 2 is how many times more acidic than a solution with pH = 6? a. 4 times b. 12 times c. 400 times d. 10,000 times Ans: d
Which group of ions is responsible for the buffer action in blood? a. HCl and NaCl b. Cl⁻ and HCl c. Cl⁻ and HCO₃⁻ d. HCO₃⁻ and H₂CO₃ Ans: d
Which of the following reagents is used to replace the –OH group in carboxylic acids with a chlorine atom? a. PCl₅ b. HOCl c. Cl₂ d. HCl Ans: a
Select the correct order of basic strength: a. HCO₃⁻ > CH₃COO⁻ > Cl⁻ > OH⁻ b. Cl⁻ < CH₃COO⁻ < HCO₃⁻ < OH⁻ c. OH⁻ < HCO₃⁻ < Cl⁻ < CH₃COO⁻ d. Cl⁻ > CH₃COO⁻ > OH⁻ > HCO₃⁻ Ans: b
