Science Practice Quiz 12

Q1.Which of the following is an example of a synthetic indicator mentioned in the text?

A. Litmus B. Turmeric C. Methyl orange D. Red cabbage leaves

Q2.What is the primary characteristic by which indicators help identify whether a substance is acidic or basic?

A. By changing their physical state B. By changing their colour C. By changing their density D. By changing their temperature

Q3.What are substances called whose odour changes in acidic or basic media?

A. Colour indicators B. Litmus indicators C. Olfactory indicators D. Synthetic indicators

Q4.Which substance is specifically mentioned in Activity 2.2 as being used to prepare an olfactory indicator?

A. Red litmus paper B. Phenolphthalein C. Finely chopped onions D. Methyl orange

Q5.According to the provided text, which of the following is NOT listed as an acid to be collected from the science laboratory?

A. Hydrochloric acid (HCl) B. Sulphuric acid (H2SO4) C. Sodium hydroxide (NaOH) D. Nitric acid (HNO3)

Q6.Which of the following is listed as a base to be collected from the science laboratory in the given text?

A. Acetic acid (CH3COOH) B. Potassium hydroxide (KOH) C. Sulphuric acid (H2SO4) D. Nitric acid (HNO3)

Q7.Which of the following is NOT mentioned as an indicator that changes colour to identify acids and bases in Activity 2.1?

A. Red litmus B. Blue litmus C. Phenolphthalein D. Onion extract

Q8.The cloth strips prepared with finely chopped onions in Activity 2.2 are primarily used for what purpose?

A. To measure the pH of solutions B. To test for the presence of salts C. To test for acids and bases using odour change D. To determine the concentration of solutions

Q9.What is the chemical formula for hydrochloric acid as explicitly mentioned in the provided text?

A. H2SO4 B. HNO3 C. HCl D. CH3COOH

Q10.What is the chemical formula for sodium hydroxide as explicitly mentioned in the provided text?

A. KOH B. Ca(OH)2 C. NaOH D. NH4OH

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Science Practice Quiz 12