Chemistry · Science General

Common Chemical Compounds and Reactions

1,204 Questions

Common chemical compounds and reactions questions test your knowledge of everyday chemicals, their formulas, and their interactions. Topics include properties of acids and bases, hard water chemistry, and compounds like baking soda and plaster of paris. This section is essential for general science preparation.

Acids and basesPlaster of parisHard water chemistryCommon chemical formulasEveryday chemical reactions

Common Chemical Compounds and Reactions Questions

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

Metals like K, Na react ______ with cold water whereas Ca reacts_____ with cold water.

  1. Violently, less violently

  2. Mildly, violently

  3. Violently, violently

  4. Mildly, does not react
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Metals like Na, K react violently with cold water to evolve hydrogen gas that catches fire. Ca on other hand, reacts less violently with cold water giving out hydrogen gas which does not catch fire.

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

Which of the following reacts with cold water vigorously?

  1. Carbon

  2. Sodium

  3. Magnesium

  4. Sulphur
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sodium is a light and soft metal that reacts vigorously with cold water. Sodium when dropped in cold water forms a ball and moves on the surface of cold water with sodium hydroxide formation accompanied with the release of hydrogen gas.
$2Na+2H _2O \rightarrow 2NaOH +H _2$

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

Which of the following is added to remove permanent hardness of water?

  1. baking soda

  2. blue vitriol

  3. washing soda

  4. milk of magnesia
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

By adding Na$ _{2} $Co$ _{3} $, all the Ca$ ^{+2} $ and and Mg$ ^{+2} $ ions which causes permanent hardness are replaced by Na$ ^{+} $, which doesn't cause hardness.

Multiple choice

A material used in a footbath for cows with foot rot problems is:

  1. Copper sulfate

  2. Monosodium phosphate

  3. Calcium carbonate

  4. Sodium chloride
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Copper sulfate is a standard chemical used in footbaths to treat and prevent foot rot and digital dermatitis in dairy cattle. It acts as an astringent and antiseptic to harden the hoof tissue.

Multiple choice chemistry water too little to waste pollution of water water pollution planet earth

Permanent hardness of water may be removed by the addition of:

  1. sodium carbonate

  2. alum

  3. potassium permanganate

  4. lime
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sodium carbonate, $Na _2CO _3$, is also known as washing soda. It can remove temporary and permanent hardness from water. Sodium carbonate is soluble but calcium carbonate and magnesium carbonate are insoluble. The water is softened because it no longer contains dissolved calcium ions and magnesium ions.

Multiple choice chemistry chemical reactions effects of oxidation reactions in daily life corrosion of metals electroplating and its application

Calcium hydroxide $\xrightarrow {\Delta}$ Calcium oxide + water. Identify the type of chemical reaction:

  1. Decomposition Reactions

  2. Neutralization Reactions

  3. Displacement Reactions

  4. Combination Reactions
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The reaction Ca(OH)2 -> CaO + H2O is a decomposition reaction where a single reactant breaks down into two or more simpler products upon heating.

Multiple choice chemistry nitrogen and sulfur sulfur and its oxides acid deposition natural resources- air, water and land

Which of the following can be used as dehydrating agents?

  1. Conc. $H _2SO _4$
  2. $POCl _3$
  3. $P _2O _5$

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A dehydrating agent is a substance that dries or removes water from a material. In chemical reactions where dehydration occurs, the reacting molecule loses a molecule of water. Sulfuric acid, concentrated phosphoric acid, hot aluminum oxide, and hot ceramic are common dehydrating agents in these types of chemical reactions. Dehydration reactions in organic synthesis often result in the conversion of the reacting molecule from one type of compound to another, such as the conversion of alcohols to alkene.