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

What is not produced by the galvanic modality?

  1. lye

  2. chemicals

  3. heat

  4. sodium hydroxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The galvanic modality uses direct current to create a chemical reaction (electrolysis) that produces sodium hydroxide (lye). It does not produce heat; heat is the primary product of the thermolysis (high frequency) modality.

Multiple choice

In galvanic electrolysis, the chemical agent the destroys hair is

  1. Sodium Hydroxide

  2. Hydrochloric Acid

  3. HCl

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

Galvanic electrolysis uses direct current to cause a chemical reaction in the follicle. This reaction produces sodium hydroxide (lye), which is the caustic agent that destroys the hair root.

Multiple choice

The negative pole produces

  1. Sodium Hydroxide

  2. Hydrochloric acid

  3. HCl

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

In galvanic electrolysis, the negative pole (cathode) is responsible for the chemical reaction that creates sodium hydroxide. The positive pole (anode) produces hydrochloric acid.

Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

Gypsum is added to cooled clinker during cement manufacture:

  1. because gypsum permits formation of fine powder

  2. to delay the initial setting time of cement

  3. to increase the hardening of cement

  4. to increase the strength of set concrete
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gypsum is a mineral and is hydrated calcium sulfate in chemical form. Gypsum plays a very important role in controlling the rate of hardening of the cement. During the cement manufacturing process, upon the cooling of clinker, a small amount of gypsum is introduced during the final grinding process.

Gypsum is added to control the “setting of cement”. If not added, the cement will set immediately after mixing of water leaving no time for concrete placing.

Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

Gypsum is added to cement because:

  1. it makes the cement very hard

  2. it increases the pace of setting of cement

  3. it slows down the initial setting of cement when water is added

  4. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Gypsum plays an important role in controlling the rate of hardening of the cement. During cement manufacturing process upon cooling of clinker a small amount of gypsum is added during the final grinding process. Gypsum controls the setting of the cement and if not added the cement will set immediately leaving no time for concrete placing.

Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

Which of the following is not an ingredient of clinker?

  1. Calcium silicate

  2. Aluminium silicate

  3. Calcium aluminium silicate

  4. Gypsum
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the manufacture of Portland cement, clinker occurs as lumps or nodules, usually $3: mm \ (0.12: in)$ to $25\ mm (0.98: in)$ in diameter, produced by sintering (fused together without melting to the point of liquefaction) limestone and alumino-silicate materials such as clay during the cement kiln stage. Gypsum is not present in it. 

Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

Sodium hydroxide is used in the manufacture of:

  1. pulp and paper

  2. textiles

  3. soap and detergents

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

Sodium hydroxide is used in many industries, mostly as a strong chemical base in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents and as a drain cleaner.

Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

Which of the following is used in the manufacture of gun powder?

  1. Chile saltpetre

  2. Nitre

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chile saltpetre(Sodium nitrate), is a deliquescent crystalline sodium salt. Nitre is potassium nitrate. They are used in the manufacture of gun powder, nitric acid etc. It is a mixture of sulfur, charcoal, and potassium nitrate (saltpeter).

Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties

Common salt besides being used in kitchen can also be used as the raw material for making:
(i) washing soda
(ii) bleaching powder
(iii) baking soda
(iv) slaked lime

  1. (i) and (ii)

  2. (i), (ii) and (iv)

  3. (i) and (iii)

  4. (i), (iii) and (iv)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A. Baking soda is sodium hydrogen carbonate which is prepared by Solvay process which is the reaction of sodium chloride,ammonia and carbon dioxide in water. The calcium carbonate is used in the reaction to get carbon dioxide gas.
${ CaCO } _{ 3 }\rightarrow CaO+{ CO } _{ 2 }\ { 2NH } _{ 3 }+{ CO } _{ 2 }+{ H } _{ 2 }O\rightarrow \left( { NH } _{ 4 } \right) _{ 2 }{ CO } _{ 3 }+{ CO } _{ 2 }+{ H } _{ 2 }O\rightarrow { NH } _{ 4 }{ HCO } _{ 3 }\ { NH } _{ 4 }{ HCO } _{ 3 }+NaCl\rightarrow { NaHCO } _{ 3 }+{ NH } _{ 4 }Cl$
B. Washing soda is sodium carbonate which is prepared from the sodium chloride.
$2NaCl+{ CaCO } _{ 3 }\rightarrow { Na } _{ 2 }{ CO } _{ 3 }+Ca{ Cl } _{ 2 }$

Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties
 Column A  Column B
 A. Bleaching powder  i. Preparation of glass
 B. Baking soda  ii. Production of $H _2$ and $Cl _2$
 C. Washing soda  iii. Decolourisation
 D. Sodium chloride  iv. Antacid

Match the chemical substances given in Column (A) with their appropriate application given in Column (B).

  1. A(ii), B(i), C(iv), D(iii)

  2. A(iii), B(ii), C(iv), D(i)

  3. A(iii), B(iv), C(i), D(ii)

  4. A(ii), B(iv), C(i), D(iii)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A. Bleaching powder is calcium hypochlorite
${ 2CaOCl } _{ 2 }+{ H } _{ 2 }{ SO } _{ 4 }\rightarrow { CaCl } _{ 2 }+{ CaSO } _{ 4 }+2HClO\ HClO\rightarrow HCl+\left[ O \right] \xrightarrow { Coloured\quad matter } Colourless\quad product$
B. Baking soda is sodium bicarbonate which is basic in nature and used as an antacid.
${ NaHCO } _{ 3 }$
C. Sodium carbonate which has a common name washing soda, a monohydrate which is used in the preparation of glass. It is used to flux silica by lowering down the temperature.
Two forms of sodium carbonate are used i.e heavy and light. The light form is obtained first and is converted to heavy form. The heavy form is is used as a solid in making glass where it is used as flux in the melting of silica.${ Na } _{ 2 }{ CO } _{ 3 }\cdot { H } _{ 2 }O$
D. The electrolysis of aqueous solution of sodium chloride gives hydrogen at the cathode and chlorine at the anode. This solution is called as the brine solution. It helps in the evolution of hydrogen gas and chloride gas.

Multiple choice chemistry chemistry in everyday life common salt some useful compounds in everyday life salts and their properties
State True or False.
Decomposition of calcium phosphate present in bone ash with concentrated sulphuric acid produces phosphoric acid.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bone ash is Tricalcium phosphate in the form of hydroxyapatite ${ Ca } _{ 5 }\left( OH \right) { \left( P{ O } _{ 4 } \right)  } _{ 3 }$. Phosphoric acid is obtained from hydroxyapatite when treated with sulphuric acid.
$2{ Ca } _{ 5 }{ \left( P{ O } _{ 4 } \right)  } _{ 3 }OH+10{ H } _{ 2 }S{ O } _{ 4 }+18{ H } _{ 2 }O\longrightarrow 6{ H } _{ 3 }P{ O } _{ 4 }+10CaS{ O } _{ 4 }.2{ H } _{ 2 }O$

Multiple choice chemistry organic compounds containing nitrogen chemical reactions of diazonium salts chemical properties of diazonium salts diazonium salts

The reagent commonly used to determine hardness of water titrimetrically is:

  1. Oxalic acid

  2. Disodium salt of EDTA

  3. Sodium citrate

  4. Sodium thiosulphate

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The total hardness of water (i.e. the concentration of dissolved cations such as $Ca^{2+}, Mg^{2+}, Fe^{3+}$ etc.) is commonly determined by the titration of a water sample with a standardized solution of the disodium salt of ethylenediaminetetraacetic acid (EDTA) using eriochrome black T or calmagite as an indicator. Calmagite has the advantage of forming indefinitely stable solutions and will be substituted without any other modification to the procedure.
Hence option B is correct.