Question

Q) Consider the following statements, Choose the incorrect one: A)The chemical equation is balance to satisfy the law of conservation of mass in chemical reaction B)We should never change the formula of an element or compound to balance and equation. C)Those reaction in which heat is evolved are known as exothermic reactions. D)When Methane (CH4) burns in oxygen of air it forms carbon monoxide and water vapour.

Answer 1

Answer:

ans4

Explanation:

when methane (ch4) burns in oxygen of air it forms carbon monoxide and water vapour

Answer 2

The incorrect option is option(D) D)When Methane (CH4) burns in the oxygen of air it forms carbon monoxide and water vapor.

• The first statement is true. A chemical reaction is balanced to obey the law of conservation of mass which states that the mass or energy can neither be created nor be destroyed in a closed system.
• The second statement is true - while balancing chemical reactions only the coefficient should be changed to balance the number of molecules on both sides.
• If we change the subscript it changes the chemical formula rendering the reaction wrong.
• The third statement is correct. Exo means external and thermic means heat. Those reactions which produce heat are known as an exothermic reactions.
• The fourth statement is incorrect - methane burns in oxygen to produce carbon dioxide and water vapor and not carbon monoxide.

The reaction is as follows -

CH4 + O2 -----------> CO2 + 2H2O

Hence The incorrect option is option(D) When Methane (CH4) burns in the oxygen of air it forms carbon monoxide and water vapor.

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