A substance Z reacts with NaOH to give salt and water only. When Z is treated with dilute HCl, a gas is evolved which gives a yellow suspension on passing into concentrated H2SO4. Substance Z is?
NaHS
Na2SO3
Na2S
NaHSO3
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lol, i can use elimination method for this question
first of all, the substance is acid because it react with base to give salt and water
from options, we have option A and D as been acidic
option A can only be the answer because there's a colour change
the solution would have remained same if it option D
My apologies for the oversight. Let's reconsider option A, NaHS.
When NaHS reacts with dilute HCl, hydrogen sulfide gas (H2S) is evolved:
NaHS + HCl -> H2S + NaCl
When this H2S gas is passed into concentrated H2SO4, it forms a yellow suspension due to the production of sulfur:
H2S + H2SO4 -> S + H2O + SO2
Given that NaHS fits the given reactions, it is also a possible candidate for substance Z. So, both option A (NaHS) and option C (Na2S) could be correct.
When Brine (sodium chloride solution)was electrolyzed using copper electrodes, 1.5dm³ of chlorine was evolved at STP. Calculate the mass of sodium hydroxide produced at the same time.
(Molar volume = 22.4dm³; NaOH= 40 g/mol
A and D are the only things that can react with a base to form a salt if D that is NaHSO3 reacts with HCL it will yield SO2 gas and SO2 gas can't react with sulphuric acid its impossible that leaves option A NaHS which will react with HCl to yields hydrogen sulphide H2S if hydrogen sulphide reacts with sulphuric acid it yields solid sulphur which causes the yellow suspension
