Acids Bases and Salts MCQ

Acids Bases and Salts MCQ/Objective Questions Class 10 Science Chapter 2

Which constituent gives a Sour taste to the pickle?

  • a. Acids
  • b. Bases
  • c. Salts
  • d. None
Answer
  • a. Acids

Which component gives a bitter taste to bitter gourd?

  • a. Acids
  • b. Bases
  • c. Salts
  • d. None
Answer
  • b. Bases

Which litmus paper will you use to check where the substance is acidic or not?

  • a. Blue 
  • b. Red
  • c. Both
  • d. None
Answer
  • a. Blue 
Explanation
Acid changes blue litmus to red

Yellow curry of turmeric also act as an indicator. It changes to reddish brown in the presence of:

  • a. Acids
  • b. Bases
  • c. Salts
  • d. All three
Answer
  • b. Bases

What is the color of litmus when the paper is in neutral PH?

  • a. Blue
  • b. Red
  • c. Purple
  • d. Orange
Answer
  • c. Purple
Explanation
Litmus is a solution extracted from lichens. In its natural state it is purple.

Which among these is not an acid base indicator

  • a. Cabbage leaves
  • b. Turmeric
  • c. Papaya
  • d. Petunia flower
Answer
  • c. Papaya
Explanation
A b and d are natural indicator. Papaya donot show such property.

Red litmus paper in acidic solution will be:

  • a. Red
  • b. Blue
  • c. Purple
  • d. Violet
Answer
  • a. Red
Explanation

If you have been given three solution: one acidic, one basic and the last one neutral. Can you indentify them with blue litmus paper?

  • a. Yes
  • b. No
  • c. Partially
Answer
  • a. Yes
Explanation
Blue litmus will turn red with acidic solution. Now we have both blue as well as red litmus paper.

Which of the following indicator will work at basic PH?

  • a. Blue litmus paper
  • b. Methyl orange
  • c. Phenolphthalein
  • d. a and c
Answer
  • c. Phenolphthalein
Explanation
methyl orange is a narrow indicator. It works in the range of PH 3.1 to 4.4. At PH 3.1 it is red. At 4.4 PH it is yellow.

Phenolphthalein changes to pink in basic condition.

To know more see activity 2.1.

Onion can be used as an olfactory indicator. As its smell vanishes in:

  • a. Acid
  • b. Bases
  • c. Both
  • d. None
Answer
  • b. Bases
Explanation
Acidic allium present in onion react with base to give odourless compound. See activity 2.2

Which among these will produce hydrogen gas with zinc?

  • a. HCL
  • b. NaOH
  • c. H2S
  • d. a and b
Answer
  • d. a and b
Explanation
acids and bases both produce hydrogen gas with metals.

Reaction between acid and base forms:

  • a. Acid
  • b. Base
  • c. Salt
  • d. Hydrogen
Answer
  • c. Salt

What is the nature of metallic oxide?

  • a. Basic
  • b. Acidic
  • c. Neutral
  • d. None
Answer
  • a. Basic
Explanation
Metal oxide reacts with acids and give salt and water. This reaction is similar to a reaction of a base with acid. So, we can conclude that metal oxide is basic in nature.

Why we should not keep curd, pickle, and sour substance in a metal container?

  • a. Metals react with acidic substances.
  • b. Metal does not react with acidic substances
  • c.  Metals have an antibiotic property which kills fermenting bacteria
  • d. None
Answer
  • a. Metals react with acidic substances.

Which among these in distilled water will not conduct electricity?

  • a. Acids
  • b. Bases
  • c. Salts
  • d. Ethanol
Answer
  • d. Ethanol
Explanation
Acids, bases and salts remain in ionic form in water thus it conducts electricity.

  • a. 
  • b. 
  • c. 
  • d. 
Answer
Explanation

Ph of 1M NaCl is:

  • a. Acidic
  • b. Basic
  • c. Neutral
  • d. None
Answer
  • c. Neutral
Explanation
Salts of strong base and strong acids are neutral.

Salts formed by the combination of strong base e.g. NAOH and weak acid viz CH3COOH is:

  • a. Acidic
  • b. Basic
  • c. Neutral
  • d. None
Answer
  • b. Basic
Explanation
Salts dissociate in water fully and form their basic and acidic counterpart. For example here CH3COONa will form CH3COOH and NAOH with water. Since NaOH is highly basic, the solution will be basic.

N.b. the reverse of this also applies. For example, a solution of a salt of a strong acid and weak base will be acidic.

Which option shows the formula of bleaching powder?

  • a. NaHCO3
  • b. CaOCl2
  • c. Na2CO3.10H2O
  • d. Ca(OH)2
Answer
  • b. CaOCl2
Explanation

NaHCO3: baking soda

Na2CO3.10H2O: washing soda

Ca(OH)2: Slaked lime

See also:

Acids Bases and Salts MCQ/Objective Questions Class 10 Science Chapter 2

Ref: ch2

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