Everyday Science · Atoms, Elements & Compounds · page 13 of 13

Some Important Compounds MCQs with Answers

Includes 8 past paper MCQs (marked).

Timed quizzes, instant results, track your progress — free

Some Important Compounds MCQs (121–127)

7 MCQs with answers and a short one-liner. Hide answers to test yourself.

Answers and one-liners are hidden. Tap an option to check that question, or show all.

121.
Washing soda (compound) has the following constituent elements?
Correct Answer: D. Na, C, O
One-liner
Washing soda is chemically sodium carbonate (Na₂CO₃), so its constituent elements are Na, C, O (sodium, carbon, and oxygen).
122.
Carbohydrates contain H & O at the ratio of _?
Correct Answer: C. 2 : 1
One-liner
Carbohydrates contain hydrogen and oxygen in the ratio of 2 : 1, the same ratio as in water (H₂O).
123.
Farming salt is _?
Correct Answer: C. NaCl
One-liner
Farming salt is NaCl (sodium chloride), which is common table salt.
124.
Al₂O₃.2SiO₂.2H₂O is the formula of _?
Correct Answer: B. Clay
One-liner
Al₂O₃.2SiO₂.2H₂O is the chemical formula of Clay (Kaolinite), a hydrated aluminium silicate mineral.
125.
Percentage of nitrogen in ammonium nitrate is?
Correct Answer: C. 33.5%
One-liner
The percentage of nitrogen in ammonium nitrate (NH₄NO₃) is 33.5%.
126.
The oxidation states of Nitrogen in NH4NO3 are _?
Correct Answer: A. -3 and +5
One-liner
The oxidation states of Nitrogen in NH4NO3 are -3 and +5.
127.
Which compound is known as lunar caustic?
Correct Answer: A. AgNO3
One-liner
Lunar caustic is the common name for silver nitrate (AgNO₃).