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Permanent hardness is due to presence of...

Permanent hardness is due to presence of soluble salts of Mg and Ca in the form of chlorides and sulphates in `H_(2)O`. It can be removed by

A

boiling

B

Clark's method

C

treatment with `Na_(2)CO_(3)`

D

all of these

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The correct Answer is:
C
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NCERT FINGERTIPS-PRACTICE PAPER 2-Practice Paper 2
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  2. The bond order of a molecule is given by

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  3. Permanent hardness is due to presence of soluble salts of Mg and Ca in...

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  4. Mark out the correct increasing order of radius.

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  5. DeltaH("neutralisation") is always

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  6. The pH of blood is

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  7. Which of the following is according to Boyle's law?

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  8. pH of a 1.0xx10^(-8) M solution of HCl is

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  9. The substance used as a adsorbentt in the column

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  10. Elements of group 14 exhibit oxidation state of

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  11. With rise in temperature, viscosity of a liquid

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  12. Air contains 21% of oxygen by volume. The number of moles of O(2) pres...

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  13. The ratio of average speed of an oxygen molcule to the RMS speed of a ...

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  14. The kinetic enerrgy of 4 mole sof nitrogen gas at 127^(@)C is (R=2" ca...

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  15. Out off N(2)O,SO(2),I(3)^(+),I(3)^(-),H(2)O,NO(2)^(-),N(3)^(-), the li...

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  16. In which of the following ionisation processes, the bond order has inc...

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  17. Which of the following structure is correctly drawn according to funda...

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  18. Back bonding in BF(3) does not afect

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  19. Ammonium carbamate when heated tto 200^(@)C gives a mixture of NH(3) a...

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  20. For the reaction, A((g))+2B((g))hArr 3C((g))+3((g)),K(p)=0.05" atm at ...

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