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Assertion :- Australian marsupials can b...

Assertion :- Australian marsupials can be taken as an example of adaptive radiation.
Reason :- A number of marsupials, evolved from an ancestral stock, but all within the Australian island continent.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

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The correct Answer is:
A
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Read the passage given below and answer the following questions: Within the 3d series, manganese exhibits oxidation states in aqueous solution from +2 to +7, ranging from Mn^(2+)(aq) to MnO_(4)^(-) (aq). Likewise, iron forms both Fe^(2+)(aq) and Fe^(3+)(aq) as well as the FeO_(4)^(2-) ion. Cr and Mn form oxyions CrO_(4)^(2-) , MnO_(4)^(-) , owing to their willingness to form multiple bonds . The pattern with the early transition metals-in the 3d series up to Mn, and for the 4d, 5d metals up to Ru and Os—is that the maximum oxidation state corresponds to the number of ‘‘outer shell’’ electrons. The highest oxidation states of the 3d metals may depend upon complex formation (e.g., the stabilization of Co^(3+) by ammonia) or upon the pH (thus MnO_(4)^(2-) (aq) is prone to disproportionation in acidic solution). Within the 3d series, there is considerable variation in relative stability of oxidation states, sometimes on moving from one metal to a neighbor, thus, for iron, Fe^(3+) is more stable than Fe^(2+) , especially in alkaline conditions, while the reverse is true for cobalt. The ability of transition metals to exhibit a wide range of oxidation states is marked with metals such as vanadium, where the standard potentials can be rather small, making a switch between states relatively easy. (Cotton, S. A. (2011). Lanthanides: Comparison to 3d metals. Encyclopedia of inorganic and Bioinorganic Chemistry.) In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage. Assertion: The highest oxidation states of the 3d metals depends only on electronic configuration of the metal. Reason: The number of electrons in the (n-1)d and ns subshells determine the oxidation states exhibited by the metal.

MOTION-EVOLUTION-Exercise - 4
  1. Assertion :- Birds and dinosaurs are close relatives to each other. ...

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  2. Assertion :- In England, before industrialisation, it was observed tha...

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  3. Assertion :- In a mixed population those that can better-adapt, surviv...

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  4. Assertion :- Australian marsupials can be taken as an example of adapt...

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  5. Assertion :-Tasmanian wolf and Placental wolf are the good example of ...

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  6. Assertion :- The rate of appearance of new forms is liked to the life ...

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  7. Assertion :- According to Lamarck, evolution of life forms had occured...

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  8. Assertion :- According to Hugo de Vries , it is mutation which causes ...

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  9. Assertion : Due to continental drift, when South America joined North ...

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  10. Assertion :- Big-Bang theory lalks of a singular huge explosion unimag...

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  11. Assertion :- All mammals like whales, bats cheetah and human etc. shar...

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  12. Assertion :- Branching descent and Natural selection are the two key c...

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  13. Assertion :- Analogous structures are a result of convergent evolution...

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  14. Assertion :- The original drifted population in new habitat becomes fo...

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  15. Assertion :- Homologous organs suggest same origin. Reason :- Organs...

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  16. Assertion : Origin of virus like structure is an example of retrogress...

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  17. Assertion:- The aquatic mammals like Dolphins whales etc. do not conta...

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  18. Assertion :- Dog fish and Whale are example of Homology. Reason : An...

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  19. Assertion :-Analogous organs show common ancestory. Reason :-Analogo...

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  20. Assertion :- Darwin's finches are calssical example of natural selecti...

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