arun sir i need your help..please help me..

please please answer this question please please sir

how many ml of 0.150 M Na₂CrO₄ will be required to oxidize 40 ml of 0.5 M Na₂S₂O₃

Cr₂O₄^2- + S₂O₃^2- ------> Cr(OH)₄^- + So₄^2-

^{a. 225 ml}

^{b. 335 ml}

^{c. 455 ml}

d.555 ml

please sir …..request

and thanks for help

Which of the following aqueous solutions remains neutral after
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