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Acids, Bases and Salts – GK Quiz with Answers – Level 3

Hard-level chemistry GK on indicators, acids in foods and stings, pH steps, antacids, acid rain and the preparation and uses of baking soda, washing soda and Plaster of Paris.

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Questions, answer key and solutions.

Questions
50
Duration
35 min
Marks
50

Negative marking

Attempts
100
Access
Free
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Normal practice, or a Simulated test

Both use the same questions. Normal practice is untimed and needs no account: choose an option and the answer and solution appear at once. The Simulated test is the real computer-based format, with one 35-minute clock, a question palette and full screen, and your score, the key and the solutions arrive when you submit.

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How the two modes differ
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Normal

Untimed

Every question on one page, loading as you scroll. Choose an option and see straight away whether it was right.

  • No timer. Nothing to start and nothing to submit. Stop whenever you like.
  • Answered as you choose. Tap an option and it is marked at once, with the correct answer shown.
  • Solutions in place. The explanation, and the video where one has been added, sit under the question.
  • Open to guests. Normal practice needs no sign-in.
Real exam conditions

Simulated

Timed CBT

The computer-based test format: one clock, a question palette, and a score the moment you submit.

  • A clock that does not pause. 35 minutes from the moment you begin, and the paper is submitted for you when it reaches zero.
  • Question palette. Answered, not answered and marked for review, section by section, as the real interface has it.
  • Full screen, proctored. The test takes over the screen; leaving it three times submits the paper.
  • Answers hidden until you submit. The key, the explanations and your score all arrive together at the end.

About this test

Acids, Bases and Salts GK Practice Quiz Level 3: Indicators, pH and Salts

Indicators, the pH scale and everyday salts are the core of this Level 3 Acids, Bases and Salts GK quiz on Aptitude360. The hard-level set also covers natural acids in foods and stings, antacids, tooth decay and acid rain. It also covers the steps for making bleaching powder and Plaster of Paris.

What this Acids, Bases and Salts Level 3 quiz tests

  • Indicators: litmus from lichen, turmeric and synthetic phenolphthalein with their colours in acids and bases
  • Natural acids: acids in vinegar, tomato and ant stings
  • pH scale: meaning of the letter p and the tenfold change per step
  • pH in daily life: stomach acid, milk of magnesia, tooth enamel and decay, and acid rain
  • Chlor-alkali process: brine electrolysis and bleaching powder from chlorine and dry slaked lime
  • Useful salts: names, water of crystallisation and uses of baking soda, washing soda, gypsum and Plaster of Paris

Key concepts for acids, bases and salts

  • Washing soda versus baking soda, a common trap
  • Heating gypsum compared with heating baking soda or limestone
  • Neutralising bee stings with a mild base
  • Colour changes when acid is added to a base containing phenolphthalein

Preparation tips for hard chemistry GK

  • Keep one table of natural source against its acid
  • Multiply by ten for every pH step of difference
  • Learn the tooth decay and acid rain thresholds separately

Who should take this Level 3 set

It is meant for General Awareness aspirants comfortable with the basics who want hard-level revision through statement and match-type questions.

FAQs about Acids, Bases and Salts – GK Quiz with Answers – Level 3

What is the pH of acid rain?
Rainwater is called acid rain when its pH falls below 5.6. It forms when oxides of sulphur and nitrogen dissolve in rainwater.
What is the chemical name of baking soda?
Baking soda is sodium hydrogencarbonate, also called sodium bicarbonate. It is a mild base used in baking powder, antacids and soda-acid fire extinguishers.
How is Plaster of Paris made from gypsum?
Plaster of Paris is made by heating gypsum at 373 K, when it loses part of its water of crystallisation. On mixing with water it sets back into a hard mass of gypsum.
What is the difference between washing soda and baking soda?
Washing soda is sodium carbonate decahydrate and is used for cleaning and removing permanent hardness of water. Baking soda is sodium hydrogencarbonate, a mild base used in cooking and as an antacid.

Test structure

How the paper is split, and how long each part runs. A section you have finished cannot be returned to.

SectionQuestionsTime
Acids, Bases and Salts GK Level 35035 min

Marking & rules

Total marks
50 across 50 questions.
Negative marking
A wrong answer costs marks. Leaving a question unanswered costs nothing.
Attempts
100 in total. An attempt is spent the moment you begin one.

What you get when you submit

The analysis is ready the moment you submit the paper.

Score and accuracy

Marks, percentage, right, wrong and skipped, and the time you took.

Section by section

The same figures for each section, so a weak one cannot hide in an average.

The full answer key

Every question with your answer, the right one, the working, and the video where there is one.

Where you stand

Your score against the spread of everyone else who has sat this test.

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