(A) In $KO_{2}$,potassium $(K)$ is an alkali metal and always exhibits an oxidation state of $+1$. The superoxide ion is $O_{2}^{-}$,where the oxidati

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The oxidation number of $K$ in $KO_{2}$ is $+4$.

(A) In $KO_{2}$,potassium $(K)$ is an alkali metal and always exhibits an oxidation state of $+1$. The superoxide ion is $O_{2}^{-}$,where the oxidation state of oxygen is $-1/2$. Therefore,the statement that the oxidation number of $K$ in $KO_{2}$ is $+4$ is incorrect. The correct oxidation number of $K$ is $+1$.

Class 11 Chemistry s-Block Elements Alkali metals

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Identify the incorrect statement from the following.

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A
The oxidation number of $K$ in $KO_{2}$ is $+4$.
B
Ionisation enthalpy of alkali metals decreases from top to bottom in the group.
C
Lithium is the strongest reducing agent among the alkali metals.
D
Alkali metals react with water to form their hydroxides.

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Match List-$I$ with List-$II$:

List-$I$ (Salt) List-$II$ (Flame colour wavelength)

$(a)$ $LiCl$ $(i)$ $455.5 \text{ nm}$

$(b)$ $NaCl$ $(ii)$ $670.8 \text{ nm}$

$(c)$ $RbCl$ $(iii)$ $780.0 \text{ nm}$

$(d)$ $CsCl$ $(iv)$ $589.2 \text{ nm}$

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List-$I$ (Salt)	List-$II$ (Flame colour wavelength)
$(a)$ $LiCl$	$(i)$ $455.5 \text{ nm}$
$(b)$ $NaCl$	$(ii)$ $670.8 \text{ nm}$
$(c)$ $RbCl$	$(iii)$ $780.0 \text{ nm}$
$(d)$ $CsCl$	$(iv)$ $589.2 \text{ nm}$

Identify the incorrect statement from the following.

Similar Questions

Baking soda is

Which metal does not react with cold water but evolves $H_2$ gas when reacted with steam?

$A$ metal $X$ on heating in nitrogen gas gives $Y$. $Y$ on reaction with ${H_2}O$ produces a colourless gas. When this gas is passed through $CuSO_4$ solution,it gives a blue colour. What is $Y$?

Match List-$I$ with List-$II$: List-$I$ (Salt) List-$II$ (Flame colour wavelength) $(a)$ $LiCl$ $(i)$ $455.5 \text{ nm}$ $(b)$ $NaCl$ $(ii)$ $670.8 \text{ nm}$ $(c)$ $RbCl$ $(iii)$ $780.0 \text{ nm}$ $(d)$ $CsCl$ $(iv)$ $589.2 \text{ nm}$ Choose the correct answer from the options given below:

In which of the following is sodium metal stored?

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