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(A) K2Cr2O7 is used as primary standard ...

(A) `K_2Cr_2O_7` is used as primary standard in volumetric analysis.
(R) It has a good solubility in water.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

Verified by Experts

The correct Answer is:
C
(A) is true but (R) is false
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AAKASH SERIES-D-BLOCK ELEMENTS-OBJECTIVE EXERCISE-4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS )
  1. (A) The free gaseous Cr atom has six unpaired electrons. (R) Half fi...

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  2. (A) E^(@) for Mn^(+3)//Mn^(+2) is more positive than Cr^(3+)//Cr^(+2) ...

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  3. (A) K2Cr2O7 is used as primary standard in volumetric analysis. (R) ...

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  4. (A) Solution of Na2CrO4 in water is intensely coloured. (R) Oxidatio...

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  5. (A) Elements of 4f sries are called Lanthanides (R) Lanthanum Belong...

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  6. (A) Silver. Gold and platinum are precious metals. (R) Silver glod a...

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  7. (A) Zn,Cd^(-) and Hg of group 12 are transition metals (R) Partiall...

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  8. (A) Mn & Hg exist in simple crystal structures. (R) Both Mn & Hg are...

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  9. (A) Metals of 4d and 5d series have greater enthalpies of atomization ...

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  10. (A) The enthalpy of atomization of zinc is the highest in 3d series. ...

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  11. (A) Second ionization enthalpies of Cr and Cn are very low (R) Both ...

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  12. (A) The calculated spin only magnetic moment of Ti^(+2) is 1.73 BM. ...

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  13. (A) Ni^(+2) salts are pink in colour (R) Ni^(+2) absorb light in IR ...

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  14. (A) Cu^(+) is highly stable in aqueous solution (R) E.C of Cu^(+) is...

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  15. (A) Chromates and dichromates are not interconvertible in aqueous solu...

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  16. (A) Cu has a unique behavior having a positive SRP. (R) Cu is unabl...

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  17. (A) Although fluorine is more electronega-tiye than oxygen, but the ab...

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  18. (A) Cr^(2+) is reducing while Mn^(3+) is oxidizing when both have d^4 ...

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  19. (A) Cr^(+3) and Co^(2+) ions have same number of unpaired electrons bu...

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  20. (A) +3 oxidation states is characteristic property of lanthanoids but ...

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