91Ó°ÊÓ

Which of the following alloy contains \(\mathrm{Cu}\) and \(\mathrm{Zn}\) ? (a) bell metal (b) aluminium bronze (c) brass (d) bronze

Bell metal is an alloy of (a) \(\mathrm{Cu}+\mathrm{Sn}\) (b) \(\mathrm{Cu}+\mathrm{Zn}\) (c) \(\mathrm{Cu}+\mathrm{Ni}\) (d) \(\mathrm{Cu}+\mathrm{Pb}\)

An extremely hot copper wire reacts with steam to give (a) \(\mathrm{Cu}_{2} \mathrm{O}\) (b) \(\mathrm{CuO}_{2}\) (c) \(\mathrm{Cu}_{2} \mathrm{O}_{2}\) (d) \(\mathrm{CuO}\)

Which of the following is produced, when copper reacts with chlorine? (a) \(\mathrm{CuCl}_{4}\) (b) \(\mathrm{Cu}_{2} \mathrm{Cl}\) (c) \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}^{4}\) (d) \(\mathrm{CuCl}_{2}\)

Which of the following metal does not react with the solution of copper sulphate? (a) \(\mathrm{Fe}\) (b) \(\mathrm{Zn}\) (c) \(\mathrm{Ag}\) (d) \(\mathrm{Mg}\)

Which of the following metal is present in brass, bronze and german silver? (a) \(\mathrm{Mg}\) (b) \(\mathrm{Cu}\) (c) \(\mathrm{Al}\) (d) \(\mathrm{Na}\)

Which of the following gas is evolved when cupric sulphide (CuS) is dissolved in dilute hydrochloric acid \((\mathrm{HCl}) ?\) (a) \(\underline{\mathrm{S}}\) (b) \(\mathrm{Cl}_{2}\) (c) \(\mathrm{H}_{2} \mathrm{~S}\) (d) \(\mathrm{H}_{2}\)

On strongly heating copper nitrate, we get (a) copper metal (b) cuprous oxide (c) cupric oxide (d) copper sulphate

What is formed when \(\mathrm{H}_{2} \mathrm{~S}\) is passed through acidified solution of \(\mathrm{CuSO}_{4} ?\) (a) \(\mathrm{CuSO}_{4}\) (b) \(\mathrm{CuS}\) (c) \(\mathrm{CuHSO}_{4}\) (d) \(\mathrm{Cu}_{2} \mathrm{~S}\)

What is produced when cuprous oxide reacts with HCl? (a) \(\mathrm{CuCl}\) (b) \(\mathrm{CuO}\) (c) \(\mathrm{HCuCl}_{2}\) (d) \(\mathrm{CuCl}_{2}\)