of the following metals is the least reactive? A. Pb B. Ca C. Cu D. Au 21. Which of the following metals is more reactive based on the reaction: Rb+Fe(NO_(3))_(2)arrow Rxn A. Rb B. Fe C. NO_(3) D. Fe(NO_(3))_(2) 2. Which of the following metals is more reactive based on the reaction: ScSO_(4)+Nbarrow NoRxn A. Nb B. Sc C. SO_(4) D. ScSO_(4) Determine whether the following reaction will occur: Pb(OH)_(2)+Niarrow A. Rxn will occur B. Rxn will not occur etermine whether the following reaction will occur and if it will, p Ag+Sn(NO_(3))_(2)arrow A. Rxn will not occur B. Rxn will occur; AgSn+NO_(3) C. Rxn will occur; Ag(NO_(3))_(2)+Sn D. Rxn will occur; AgNO_(3)+Sn

1. The least reactive metal among the options is Au (Gold). Gold is a noble metal and is known for its low reactivity.<br /><br />2. In the reaction $Rb+Fe(NO_{3})_{2}\rightarrow Rxn$, Rb (Rubidium) is more reactive. This is because Rubidium is an alkali metal and is more reactive than transition metals like Iron (Fe).<br /><br />3. In the reaction $ScSO_{4}+Nb\rightarrow NoRxn$, Nb (Niobium) is more reactive. This is because Niobium is a transition metal and is more reactive than Scandium (Sc).<br /><br />4. The reaction $Pb(OH)_{2}+Ni\rightarrow$ will not occur. This is because Lead (Pb) is less reactive than Nickel (Ni), so Nickel cannot displace Lead from its compound.<br /><br />5. The reaction $Ag+Sn(NO_{3})_{2}\rightarrow$ will occur. This is because Silver (Ag) is less reactive than Tin (Sn), so Silver can displace Tin from its compound. The products of the reaction will be $AgNO_{3}+Sn$.