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Two vessels contain equal quantities of 40% alcohol. Sachin changed the concentration of the first vessel to 50%' by. Adding extra quantity of pure alcohol. Vivek changed the concentration of the second vessel to 50% replacing a certain quantity of the solution with pure alcohol. By what percentage is the quantity of alcohol added by Sachin more/less than that replaced by Vivek? 11 1/9% b. 11 1/9% c. 16 2/3% d. 20 % more

The current in amperes when 11.74 g of nickel is deposited from a nickel(II) ion solution in 1000 second is ________ (At. Mass of Ni = 58.7)

A test for complete removal of Cu^(2+) ions from a solution of Cu^(2+) (aq) is to add NH_3 (aq). A blue colour signifies the formation of complex [Cu(NH_3)_4]^(2+) having K_f = 1.1 xx 10^13 and thus confirms the presence of Cu^(2+) in solution. 250 mL of 0.1 M CuSO_4 (aq.) is electrolysed by passing a current of 3.512 ampere for 1368 second. After passage of this charge sufficient quantity of NH_3 (aq) is added to electrolysed solution maintianing [NH_3] = 0.10 M. If [Cu(NH_3)_4]^(2+) is detectable upto its concentration as low as 1 xx 10^(–5) , would a blue colour be shown by the electrolysed solution on addition of NH_3 ?

Amongst the following, the total number of compounds whose equesous solution turns red litmus paper blue is: {:(NaCN,KCl,CH_(3)COONH_(4),NaH_(2)PO_(4),ZnCl_(2), Na_(3)PO_(4)),(Fe(NO_(3))_(3),Na_(2)CO_(3),NH_(4)Cl,NaHCO_(3),Na_(2)C_(2)O_(4),Na_(2)HPO_(4)):} Given: {:("Acid",ka_(1),ka_(2),ka_(3)),(H_(3)PO_(4),10^(-3),10^(-8),10^(-12)),(H_(2)CO_(3),10^(-6),10^(-11),-),(H_(2)CO_(3),10^(-2),10^(-5),-):}