Which of the following reaction is called redox reaction?
\(CaCO_{3}\rightarrow CaO+CO_{2}\)
\(MgO+2HCl \rightarrow MgCl_{2}+2H_{2}O\)
\(NaOH+HCl \rightarrow NaCl+H_{2}O\)
\(H_{2}+I_{2}\rightarrow 2HI\)

Which of the following reaction show the reducing property of hydrochloricacid? \(ZnCO_{3}+2HCl \rightarrow ZnCl_{2}+H_{2}O+CO_{2}\) \(Mg+2HCl \rightarrow MgCl_{2}+H_{2}\) \(MnO_{2}+4HCl\rightarrow MnCl_{2}+2H_{2}O+Cl_{2}\) \(NH_{4}OH+HCl\rightarrow NH_{4}Cl+H_{2}O\)

Which of the followings are disproportionation reactions? (A) \(2O_{3} \rightarrow 3O_{2}\) (B) \(KClO_{3} \rightarrow 3KClO_{4}+KCl\) (C)\(2H_{2}O_{2}\rightarrow2H_{2}O+O_{2}\) (D) \(2KO_{2}+2H_{2}O\rightarrow4KOH+3O_{2}\)

Which of the following reaction cannot change \(SO_{2}\rightarrow SO_{4}^{2-}\)? \(SO_{2}+MnO_{4}^{-}\rightarrow\) \(SO_{2}+Cr_{2}O_{7}^{2-}\) \(SO_{2}+Fe^{3+}\rightarrow\) \(SO_{2}+Ba(OH)_{2}\rightarrow\)

Which rate equation is correct for reaction \(H_{2}O_{2}\rightarrow H_{2}O+\frac{1}{2}O_{2}\)

Which of the following is a disproportionation reaction \(4Zn+10HNO_{3}\rightarrow4Zn(NO_{3})_{2}+NH_{4}NO_{3}+3H_{2}O\) \(2KBr+3H_{2}SO_{4}\rightarrow2KHSO_{4}+SO_{2}+Br_{2}+2H_{2}O\)\(2KMnO_{4}+5H_{2}S+4H_{2}SO_{4}\rightarrow2KHSO_{4}+2MnSO_{4}+5S+8H_{2}O\),\(S_{8}+NaOH \rightarrow Na_{2}S_{5}+Na_{2}S_{2}O_{3}+H_{2}\)

In the reaction \(2NaOH+H_{3}PO_{4}\rightarrow Na_{2}HPO_{4}+2H_{2}O\) ,the equivalent weight of phosphoric acid \(H_{3}PO_{4}\) is

\(CH_{3}-Mg-Br+CO_{2}\rightarrow X\xrightarrow[]{H_{2}O}\) Y In this reaction "Y' is