A brief description of four substances is given asW: It can react with both acids and bases, used to make aircrafts.X: It reacts with boiled water and not with cold water.Y: It does not react with acids and water, used to make computer chips. It is a metalloid.Z: It can displace silver from silver nitrate solution but it can not react even with steam.W, X , Y and Z respectively.(1) Zn, Mg, Si, C (2) Fe, Cu, Si, Al (3) Al, Mg, Si, C (4) Al, Mg, Si, Cu

Metal X forms an oxide that reacts with acids but not with strong alkalis .  Metal y forms an oxide that reacts with acids and strong alkalisMetal Z forms a hydroxide that is not decomposed by heating Which combination BEST identifies X , Y and Z ? AX= calcium , Y = zinc , Z = magnesium BX= iron , Y = aluminium , Z = sodiumCX= aluminium , Y = sodium, Z = calcium DX= magnesium , Y = copper , Z = potassium

t can react with both acids and bases, used to make aircrafts.

When a metal X is treated with cold water, it gives a basic salt Y with molecular formulaXOH (Molecular mass = 40) and liberates a gas Z which easily catches fire. Identify X, Y andZ and also write the reaction involved.

List one metal which reacts very slowly in water

Match the elements Hydrogen, Germanium, Bromine, Mercury and Sodium with the corectstatements (i) to (v).i) It is a diatomic gasii) It is a metallic liquidiii) It is a non metallic liquidiv) It is a very reactive metalv) It is a metalloid