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Test: Acids Bases & Salts - UPSC MCQ


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10 Questions MCQ Test Science & Technology for UPSC CSE - Test: Acids Bases & Salts

Test: Acids Bases & Salts for UPSC 2024 is part of Science & Technology for UPSC CSE preparation. The Test: Acids Bases & Salts questions and answers have been prepared according to the UPSC exam syllabus.The Test: Acids Bases & Salts MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Acids Bases & Salts below.
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Test: Acids Bases & Salts - Question 1

What does phenolphthalein indicate when the solution is basic?

Detailed Solution for Test: Acids Bases & Salts - Question 1

When phenolphthalein is added to a basic solution, it changes its color to dark pink. This change helps us know if a solution is basic or not. So, when you see the pink color, you can tell that the solution is basic.

Test: Acids Bases & Salts - Question 2

“Litmus” natural dye in an extract of which of the following:

Detailed Solution for Test: Acids Bases & Salts - Question 2

Litmus paper is used as an indicator to check acids and bases. Acids turn blue litmus red.
Litmus is a mauve (purple) colour pigment obtained from Lichens. It turns red when added to acidic solution and blue when added to a basic solution.

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Test: Acids Bases & Salts - Question 3

State whether the following statement is True or False

Acids taste sour and bases taste bitter.

Detailed Solution for Test: Acids Bases & Salts - Question 3
  • True! Acids like curd, lemon juice, orange juice, and vinegar taste sour because they contain acids.
  • On the other hand, bases like baking soda taste bitter.
  • So, acids usually have a sour taste, while bases have a bitter taste.
  • When you taste something sour like lemon juice, it might have acids in it.
  • And if something tastes bitter like baking soda, it could be a base.
  • Remember, sour for acids and bitter for bases!
Test: Acids Bases & Salts - Question 4

What new substance is formed as a result of a neutralization reaction between hydrochloric acid and sodium hydroxide?

Detailed Solution for Test: Acids Bases & Salts - Question 4

In the neutralization reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH), the new substance formed is sodium chloride (NaCl), commonly known as table salt. This salt is produced along with water (H2O) as the products of the reaction, highlighting the typical outcome of a neutralization process between an acid and a base.

Test: Acids Bases & Salts - Question 5

Which of the following is a natural indicator?

Detailed Solution for Test: Acids Bases & Salts - Question 5

Turmeric is a natural acid-base indicator. It turns yellow in an acidic medium and changes its colour to red in a basic medium.

Test: Acids Bases & Salts - Question 6

What color does litmus paper turn when added to an acidic solution?

Detailed Solution for Test: Acids Bases & Salts - Question 6

Litmus paper turns red when added to an acidic solution. This color change is a result of the acidic nature of the solution, which causes the litmus paper to shift its color to red. It is a simple and effective way to test for acidity using a natural indicator like litmus.

Test: Acids Bases & Salts - Question 7

Which acid is commonly found in vinegar?

Detailed Solution for Test: Acids Bases & Salts - Question 7

Acetic acid is the acid commonly found in vinegar. It is a weak acid that gives vinegar its characteristic sour taste and pungent smell. Acetic acid is also widely used in the food industry for pickling and preserving food items.

Test: Acids Bases & Salts - Question 8
What is the pH nature of distilled water?
Detailed Solution for Test: Acids Bases & Salts - Question 8
Distilled water is neutral, with a pH of around 7. It does not change the color of either blue or red litmus paper, which signifies its neutral nature.
Test: Acids Bases & Salts - Question 9
What happens in a neutralization reaction?
Detailed Solution for Test: Acids Bases & Salts - Question 9
In a neutralization reaction, an acid reacts with a base to form salt and water. This process is characterized by the combination of H⁺ ions from the acid and OH⁻ ions from the base to form water (H₂O), and the remaining ions form a salt.
Test: Acids Bases & Salts - Question 10
What is the final color of lemon juice when tested with China rose indicator?
Detailed Solution for Test: Acids Bases & Salts - Question 10
Lemon juice is acidic, so when tested with China rose indicator, it will turn dark pink (magenta). This color change indicates the acidic nature of the solution, as China rose turns acidic solutions to dark pink.
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