Some Chemical Reactions MCQs with Answers

A red-brown gas is released on heating lead nitrate. It is an example of:

• A.Displacement reaction
• B.Combination reaction
• C.Decomposition reaction
• D.Neutralization reaction

Dry Ice is directly converted into gas is an example of _?

• A.Evaporation
• B.Condensation
• C.Sublimation
• D.Deposition

Which statement is incorrect about chemical reactions?

• A.New substances are formed during chemical reactions
• B.States of matter does not change during chemical reactions
• C.Energy is either absorbed or released during chemical reactions
• D.Chemical bonds are broken and formed during chemical reactions

If one mole of gaseous hydrogen is mixed with one mole of gaseous iodine in an empty container, then with the passage of time, the rate of _?

• A.Forward reaction decreases
• B.Forward reaction increases
• C.Reverse reaction decreases
• D.Both forward and reverse reactions increase

What is produced when fuel is burned?

• A.Oxygen gas
• B.Nitrogen gas
• C.Carbon dioxide gas
• D.Hydrogen gas

There is a chemical under consideration. We do not know if it is HCl or H₂SO₄. Which of the following compounds will react with the chemical under consideration to produce a precipitate and hence confirm that the chemical is H₂SO₄?

• A.NaCl
• B.Ba(NO₃)₂
• C.AgNO₃
• D.NaOH

Which is the best indication that a chemical reaction has taken place?

• A.Change in color of the solution
• B.Formation of a precipitate
• C.Metal budding when placed in an unknown liquid
• D.Evolution of gas bubbles

The identification test for the Aldehydes includes ?

• A.Iodine test
• B.Biuret test
• C.Fehling's test
• D.Benedict's test

Single displacement reaction involves?

• A.Neutralization Reaction
• B.Precipitation Reaction
• C.Redox Reaction
• D.Decomposition Reaction

Which one among the following is an example of decomposition reaction?

• A.Formation of carbon dioxide from carbon and oxygen
• B.Formation of water from hydrogen and oxygen
• C.Formation of sodium chloride from sodium and chlorine
• D.Formation of hydrogen and oxygen from water