Assertion :Plasma membrane is selectively permeable. Reason: It allows some solutes to pass through it readily along with solvents.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Plasma membrane is the outer covering of all cells but it is present below the cell wall in plant cells. It is composed of phospholipid bilayer structure with embedded proteins and gives the mosaic-like appearance. Plasma membrane is a semi-permeable. It is also selectively or differentially permeable. Semi permeable means half permeable, i.e., plasma membrane will allow free transport of solvent like water across it but will not allow free transport of solute particles. For solute particles the plasma membrane is selectively or differentially permeable, i.e., it will allow only selected solute particles to pass through and will have differential permeability for different solute particles. Thus, the correct answer is option A.

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Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C H_{2}$ - group.

Assertion (A) Order and molecularity are same.

Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

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