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Water has maximum density at 4°C....

Water has maximum density at 4°C.

A

If both `(A)` and `(R )` are correct and `(R )` is the correct explanation of `(A)`

B

If both `(A)` and `(R )` are correct and `(R )` is the correct explanation of `(A)`

C

If `(A)` is correct but `(R )` is incorrect

D

If `(A)` is incorrect but `(R )` is correct

Text Solution

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The correct Answer is:
D

Due to H-bonding ice forms cage like structure Thus ice occupies more volume add `4^(@)C` molecules come closer Hence density of water is highest at `4^(@)C` Therefore ice floats over water .
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CENGAGE CHEMISTRY ENGLISH-CHEMICAL BONDING AND MOLECULAR STRUCTURE-Exercises Assetion Reasoning
  1. Assertion Carbon tetrachloride dose not form a precipitate of AgCI wit...

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  2. Assertion Both NO(3)^(Theta) and CO(3)^(2-) ions are triangular planar...

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  3. Water has maximum density at 4°C.

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  4. Assertion Boiling point of halogen acids are in the order HF gtHBr gt ...

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  5. Assertion Ionic compounds tend to be non-volatile Reasoning Intermol...

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  6. Assertion : Water is a good solvent for ionic compounds but poor for c...

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  7. Assertion : The atoms in a covalent molecule are said to share electro...

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  8. Assertion : Na(2)SO(4) is soluble in water while BaSO(4) is water inso...

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  9. Assertion : The dipole moment helps to predict whether a molecule is ...

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  10. Assertion BF(3) is a weaker Lewis acid than BCI(3) Reasoning In BF(3...

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  11. Assertion Bond order for N(2)^(o+) and N(2)^(Theta) are same (i.e2.5) ...

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  12. Assertion Among two cations of similar size the polarising power of ca...

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  13. Assertion BF(3) has greater dipole momnet than H(2)S Reasoning Fluor...

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  14. Assertion Both pi(2P(x)) and pi^(**)(2P(x))MO's have one nodal plane e...

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  15. Assertion H(2),Li(2),B(2) each has a bond order of 1 and hence are equ...

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  16. Assertion : Bond order can assume any value including zero. Reason :...

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  17. Assertion : N(2) and NO^(+) both are diamagnetic substances. Reason ...

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  18. Assertion B(2) molecule is diamagnetic Reasoning The highest occupie...

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  19. Asseration: SeCl(4), does not havea tetrahedral structure. Reason: S...

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  20. Assertion : All F - S - F angle in SF(4) are greater than 90^(@) but ...

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