Assertion :Phosphorus cycle is an imperfect cycle as a sufficient amount of phosphorus combines with $A l^{3 +}$ , $F e^{2 +}$ and $C a^{2 +}$ to form insoluble and unavailable salts. Reason: Phosphate circulates in abiotic environment in lithosphere as well as atmosphere.

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 C Assertion is correct but Reason is incorrect
Phosphorus cycle is an example of sedimentary cycle. Greatest reservoir of phosphate in the world is relatively insoluble ferric and calcium phosphate in rocks. Cyclic pool is soil for terrestrial ecosystems(lithosphere) and water for aquatic ecosystem(hydrosphere). Phosphate circulates in the abiotic environment in lithosphere as well as hydrosphere. Atmosphere or gaseous cycle is absent. Inside soil some phosphorus is lost through leaching. Similarly, a sufficient amount of phosphorus combines with calcium, iron or aluminum and becomes insoluble. It settles down at the bottom of lake or ocean as sediment. Bone and teeth may also remain undegraded. Such phosphorus becomes part of lithosphere. It is released after a very long interval when the rocks containing them are exposed to weathering agencies or are mined. Thus, phosphorus cycle is an imperfect cycle.
So, the correct answer is 'Assertion is correct but Reason is incorrect'.

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Similar questions

Q. ASSERTION:

Δ_{f} H^{o}

for white phosphorus has been taken to be zero, whereas black phosphorus is the most stable allotrope of phosphorus and this is the only exception.

REASON:
The reference standard state of white phosphorus is taken despite the fact that this form is not the most stable allotrope but simply the most reproducible form of phosphorus.

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

{SiO}_{2}

to form slag.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(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 – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

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

Q. Assertion: The compressibility factor for

H_{2}

and

H e

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

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

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Assertion :Phosphorus cycle is an imperfect cycle as a sufficient amount of phosphorus combines with Al3+, Fe2+ and Ca2+ to form insoluble and unavailable salts. Reason: Phosphate circulates in abiotic environment in lithosphere as well as atmosphere.

Assertion :Phosphorus cycle is an imperfect cycle as a sufficient amount of phosphorus combines with $A l^{3 +}$ , $F e^{2 +}$ and $C a^{2 +}$ to form insoluble and unavailable salts. Reason: Phosphate circulates in abiotic environment in lithosphere as well as atmosphere.