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Arrange the chemicals in sequence for th...

Arrange the chemicals in sequence for the removal of impurities `H_2S, SO_2, PH_3` and `H_2O`, respectively, in the purification of hydrogen gas.
( 1) phosphorus pentoxide (2) lead nitrate solution
(3) silver nitrate solution (4) caustic potash

A

1 2 3 4

B

2 3 1 4

C

2 4 3 1

D

1 4 2 3

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(i) lead nitrate solution
(ii) caustic potash
(iii) silver nitrate solution
(iv) phosphorus pentoxide
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