Pick out the incorrect statement:

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(D) $1$. $MnO_2$ reacts with conc. $HCl$ to form $MnCl_2$,$Cl_2$ gas,and $H_2O$. It does not form $Mn^{4+}$ ions because $Mn^{4+}$ is unstable in the

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Decomposition of acidic $KMnO_4$ is not catalysed by sunlight.

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(D) $1$. $MnO_2$ reacts with conc. $HCl$ to form $MnCl_2$,$Cl_2$ gas,and $H_2O$. It does not form $Mn^{4+}$ ions because $Mn^{4+}$ is unstable in the presence of $Cl^-$ ions. This statement is correct.$2$. $MnO_2$ reacts with hot conc. $H_2SO_4$ to produce $MnSO_4$,$O_2$ gas,and $H_2O$. This statement is correct.$3$. When $MnO_2$ is fused with $KOH$ in the presence of an oxidizing agent like air,$KNO_3$,$PbO_2$,or $NaBiO_3$,it forms green potassium manganate $(K_2MnO_4)$. This statement is correct.$4$. The decomposition of $KMnO_4$ is indeed catalyzed by light (sunlight). Therefore,the statement that it is 'not catalysed by sunlight' is incorrect.

Column $A$	Column $B$
$(1)$ Brass	$(a)$ $Ni$ $(60\%)$,$Cr$ $(40\%)$
$(2)$ Bronze	$(b)$ $Cu$ $(80\%)$,$Sn$ $(20\%)$
$(3)$ Cupronickel	$(c)$ $Cu$ $(90\%)$,$Sn$ $(10\%)$
$(4)$ Nichrome	$(d)$ $Cu$ $(70\%)$,$Zn$ $(30\%)$
	$(e)$ $Cu$ $(75-85\%)$,$Ni$ $(15-25\%)$

List-$I$ (Aquated Ion)	List-$II$ (Colour)
$A. Ni^{2+}$	$I. \text{Violet}$
$B. Fe^{3+}$	$II. \text{Blue}$
$C. Mn^{3+}$	$III. \text{Yellow}$
$D. V^{4+}$	$IV. \text{Red}$
	$V. \text{Green}$

Similar Questions

Match Column $A$ with Column $B$:

Column $A$ Column $B$

$(1)$ Brass $(a)$ $Ni$ $(60\%)$,$Cr$ $(40\%)$

$(2)$ Bronze $(b)$ $Cu$ $(80\%)$,$Sn$ $(20\%)$

$(3)$ Cupronickel $(c)$ $Cu$ $(90\%)$,$Sn$ $(10\%)$

$(4)$ Nichrome $(d)$ $Cu$ $(70\%)$,$Zn$ $(30\%)$

$(e)$ $Cu$ $(75-85\%)$,$Ni$ $(15-25\%)$

In ruby and emerald,the metal ion$(s)$ present is/are

Fusion of $MnO_2$ with $KOH$ in the presence of air or an oxidizing agent like $KNO_3$ forms a colored compound. Identify the product and its color.

Match the following:

List-$I$ (Aquated Ion) List-$II$ (Colour)

$A. Ni^{2+}$ $I. \text{Violet}$

$B. Fe^{3+}$ $II. \text{Blue}$

$C. Mn^{3+}$ $III. \text{Yellow}$

$D. V^{4+}$ $IV. \text{Red}$

$V. \text{Green}$

Which transition metal compound is used in a dry battery cell?

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