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If 10^(21) molecules are removed from 20...

If `10^(21)` molecules are removed from 200 mg of `CO_(2),` the number of moles of `CO_(2)` left is

A

`2.88xx10^(-3)`

B

`28.8xx10^(-3)`

C

`0.288xx10^(-3)`

D

`1.66xx10^(-2)`

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The correct Answer is:
A
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NCERT FINGERTIPS ENGLISH-PRACTICE PAPER 3-Practice Paper 3
  1. Which of the following is not the consequence of H-bonding?

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  2. The two equilibrium AB hArr A^(+) + B^(-) and AB+B^(-)hArrAB(2)^(-) ar...

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  3. Consider the following equilibrium in a closed container, N(2)O(4(g)...

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  4. The degree of dissociation alpha of the reaction" N(2)O(4(g))hArr 2N...

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  5. (I) H(2)O(2)+O(3) to H(2)O+2O(2) (II) H(2)O(2)+Ag(2)O to 2Ag+H(2)O+O...

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  6. Which set of quantum numbers is possible for the last electron of Mg^(...

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  7. Which of the following reactions is said to be entropy driven?

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  8. If 10^(21) molecules are removed from 200 mg of CO(2), the number of m...

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  9. The ions O^(-2),F^(-),Mg^(2+) and Al^(3+) are isoelectronic. Their ion...

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  10. The pH of 0.004 M hydrazine solution is 9.7. its ionisation constant (...

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  11. The vapoour density of a mixture containing NO(2) and N(2)O(4) is 38.3...

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  12. An alkane C(7)H(16) is produced by the reaction of lithium di(3-pentyl...

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  13. The enthalpy of neutralisation of NH(4)OH and CH(3)COOH is -10.5 kcal ...

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  14. When LiNO(3) is heated, it gives oxide, Li(2)O whereas other alkali m...

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  15. Which one of the following statements is not true?

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  16. The solubility product of MgF(2) is 7.4xx10^(-11). Calculate the solub...

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  17. The aqueous solution of potash alum [K(2)SO(4)*Al(2)(SO(4))(3)*24H(2)O...

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  18. For reaction, 2NOCl((g))hArr2NO((g))+Cl(2(g)),K(c) at 427^(@)C is 3xx1...

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  19. At a certain temperature, the equilibrium constant K(c) is 16 for the ...

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  20. For which of the following reactions, the degree of dissociation canno...

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