Identify the gas produced due to reduction of $NH_4^{+}$ ions at cathode during working of dry cell.

In the electrochemical cell $H_{2(g)}, 1 \ atm \ | \ H^+_{(aq)}, 1 \ M \ || \ Cu^{2+}_{(aq)}, 1 \ M \ | \ Cu_{(s)}$,which of the following statements is true?

Give the cell reaction,cell representation,and the formula for the cell potential of a copper-silver galvanic cell.

Which of the following will be able to react with dilute $HCl$ to give hydrogen gas?

Match List – $I$ (Laws) with the List – $II$ (Mathematical expression):

List – $I$	List – $II$
$(a)$ Henry’s law	$(i)$ $p_1 = x_1 p_1^o$
$(b)$ Raoult’s law	(ii) $p = K_H x$
$(c)$ First law of thermodynamics	(iii) $\Lambda_m^o = \nu_+ \lambda_+^o + \nu_- \lambda_-^o$
$(d)$ Kohlrausch’s law	(iv) $\Delta U = q + w$

In the cell $Zn | Zn^{2+} || Cu^{2+} | Cu$,the negative electrode is