Read the given statements and select the correct option.Statement 1: Phosphorus burns in air at room temperature.Statement 2: It is an example of spontaneous combustion.A) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.B) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.C) Statement 1 is true and statement 2 is false.D) Both statements 1 and 2 are false
Question
Read the given statements and select the correct option.Statement 1: Phosphorus burns in air at room temperature.Statement 2: It is an example of spontaneous combustion.A) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.B) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.C) Statement 1 is true and statement 2 is false.D) Both statements 1 and 2 are false
Solution
The correct option is B) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
Explanation: Statement 1 is true because phosphorus does burn in air at room temperature. This is due to its high reactivity.
Statement 2 is also true. Spontaneous combustion is a type of combustion which occurs by self-heating (increase in temperature due to exothermic internal reactions), followed by thermal runaway (self-heating which rapidly accelerates to high temperatures) and finally, ignition.
However, statement 2 is not the correct explanation of statement 1. The burning of phosphorus in air is not necessarily an example of spontaneous combustion. It is a reaction that requires an ignition source. Once ignited, phosphorus burns vigorously. Spontaneous combustion would not require an ignition source.
Similar Questions
Read the given statements and select the correct option.Statement 1: Phosphorus burns in air at room temperature.Statement 2: It is an example of spontaneous combustion.
Assertion (A): In case of burning, air and moisture are necessary.Reason(R): Oxygen is a supporter of combustion.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not the correct explanation of A(c) A is true but R is false(d) A is false but R is true
Statement 1: A chemical change may be accompanied by evolution of a gas and changein colour. Statement 2 : Photosynthesis and digestion are chemical changes.A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.B.Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.C. Statement 1 is false and statement 2 is true.D. Both statements 1 and 2 are incorrect
Statement I: If heat is added to a system, its temperature must increase.Statement II: If positive work is done by a system in a thermodynamic process, its volume must increase.In the light of the above statements, choose the correct answer from the options given belowStatement I is true but Statement II is falseBoth Statement I and Statement II are falseBoth Statement I and Statement II are trueStatement I is false but Statement II is true
Assertion (A): LPG can catch fire easily.Reason(R): LPG has low ignition temperature.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not the correct explanation of A(c) A is true but R is false(d) A is false but R is true
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.