Chemical Reactions and Equations: Expression that Gives the Identities and Quantities of the Substances Involved in a Reaction

In this quiz, you will find questions related to chemicals, chemical equations, and Chemical Reactions.

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Which reactant is reduced in given reaction CuO + H2 → Cu + H2O

Hydrogen Oxygen Copper Oxide none of the above.

A substance x is an oxide of an group 2 element is used in cement industry. On treatment with water it forms solution which turns red litmus to blue. Identify X ?

Slaked lime Limestone Quicklime Silver sulphide

Which of the following does not involve a chemical reaction?

Digestion of food in our body Process of respiration Burning of candle wax when heated Melting of candle wax on heating

Which of the following is Not True with respect to the neutralisation reaction?

Salt is formed. Reaction occurs between an acid and a base. Reactive element displaces less reactive element. Reactants are in gaseous state.

The following reaction is used for the preparation of oxygen gas in the laboratory: Which of the following statement about the reaction is correct?

It is a decomposition reaction and endothermic in nature. It is a combination reaction. It is a decomposition reaction and accompanied by release of heat. It is a photochemical decomposition reaction and exothermic in nature.

Which option denotes a double displacement reaction?

A + B + C A + B → C AC + BD → AD + BC AC + B → AB + C

Which of the following is not physical change?

Boiling of water to give water vapour Melting of ice to give water Dissolution of salt in water Combustion of Liquefied Petroleum Gas (LPG)

A teacher gave two test tubes to the students, one containing water and the other containing sodium hydroxide. She asked them to identify the test tube containing sodium hydroxide solution. Which one of the following can be used for the identification?

Blue litmus

Red litmus

Sodium carbonate solution

Dilute hydrochloric acid

Which of the following is an endothermic process?

Dilution of sulphuric acid Sublimation of dry ice Condensation of water vapours Respiration in human beings

What type of chemical reactions take place when electricity is passed through water?

Displacement Combination Decomposition Double displacement

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is:

1:1 2:1 4:1 1:2

The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called:

Antioxidation Reduction Rancidity Corrosion

Oxidation is a process which involves

Addition of oxygen

Addition of hydrogen

Removal of oxygen

Removal of hydrogen

Consider the following statements, choose the incorrect one(s):

The chemical equation is balance to satisfy the law of conservation of mass in chemical reaction. We should never change the formula of an element or compound to balance and equation. Those reaction in which heat is evolved are known as exothermic reactions. When Methane (CH4) burns in oxygen of air it forms carbon monoxide and water vapour.

The following reaction is used for the preparation of oxygen gas in the laboratory. Which of the following statements (s) is/are correct about the reaction? 2KClO3 (s) + Heat/ Catalyst → 2KCl(s) + 302 (g)

Which of the following processes involve chemical reactions?

A storing of oxygen gas under pressure in a gas cylinder. Liquefaction of air. Keeping petrol in china dish in an open. Heating copper wire in the absence of air at high temperature.

The following reaction is an example of : 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)

Displacement reaction and Neutralisation reaction Combination reaction and Redox reaction Displacement reaction and Redox reaction Neutralisation reaction and Redox reaction

When S02 gas is passed through a saturated solution of H2S, which of the following reaction occurs?

SO2 + 2H2S → 2H20 + 3S

SO2 + 2H2S → H20 + 3S

SO2 + H2S → H2O + S

SO2 + H2O → SO3 + H2

Which of the following is not a physical change?

Boiling of water to give water vapour

Melting of ice to give water

Dissolution of salt in water

Combustion of Liquefied Petroleum Gas (LPG)

Color of magnesium oxide is

White