Assertion :The plasmalemma is a differential permeable membrane. Reason: Plasmalemma only allow useful substances to move inside the cell.

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. The lipid molecules give fluidity and elasticity to the membrane and membrane protein gives semi-permeability to the membrane. Plasma membrane is also selectively or differentially permeable. It allows free transport of solvent, i.e., 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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Q. Assertion: The compressibility factor for

H_{2}

and

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(1 + \frac{P b}{R T})

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Assertion (A) All collision of reactant molecules lead to product formation.

Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

(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 of the reaction can be zero or fractional.

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

Assertion (A) Order and molecularity are same.

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