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Ques. No. 4

Ques. No. 4 Challengers* In each 4 C and 2m'. of was filled pieces in tube A. nail was put in test B. Was cd in C and a Wire placed •n tot tube O. h the following option isjare correct about atRh•e (a) Zinc more reactive than aluminium (b) Copper is more reactive than aluminium Zinc is more reactivc than copper (d) Zinc. iron silver and copper are less reactive than aluminium. 2 On the basis of the sequence of the given reactions identify the most and Jcast reactive elements: 6 7 8 x and z (c) Z and X (b) Y and Z (d) ZandY 3 A metal M has electronic configuration 2.8.3 and occurs in earth's crust and its oxide It is more reactive than zinc. Which of the following options (s) is/are correct? (a) The metal M is iron (b) The metal M is lead (c) Theore from which metal M is extracted in haematite. (d) Theore from which metalMis extracted is bauxite. 4 Metal With oxygen tofor•m metallic oxide MO This oxide reacts with moisture and carbon dioxide of the atmosphere to form a basic carbonate metal M. The (a) Cu 5 BeakersA.BandCcontain zincsulphate. silver nitrate and iron (11) sulphate solutions respectively C.opoer A student puts containing soll sulphate. brown coating nail which w a' (a) zinc sulph (c) copper sul Which of the f (b) cuso.qaq (d) CuSO, Hydrogen beca use (a) hydro temperat (b) riskof (c) hydrog temper (d) many Alloys arc metal or contain (a) Brass (c) Amalg E is an ele affected The eleme (a) coppe (c) alumi

Dear student
Since the metal forms an oxide MO, the metal is divalent. Since it forms a basic carbonate when exposed to moisture and carbon dioxide , therefore it must be copper. Since copper is less electropositive than iron, if iron is covered with copper it can prevent rusting also.
So the metal is Copper

Regards
 

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In my opinion i think the answer is copper.

Because copper reacts with oxygen to form CuO and when it reacts with CO2 and moisture it forms copper carbonate which forms a green coating on copper.
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