(A) $2Na + 2H_2O \to 2NaOH(aq) + H_2(g)$$(A) \quad \quad \quad \quad \quad \quad \quad (C) \quad \quad \quad (B)$$2NaOH + Zn \to Na_2ZnO_2 + H_2(g)$$(

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(A) $2Na + 2H_2O \to 2NaOH(aq) + H_2(g)$$(A) \quad \quad \quad \quad \quad \quad \quad (C) \quad \quad \quad (B)$$2NaOH + Zn \to Na_2ZnO_2 + H_2(g)$$(C) \quad \quad \quad (D) \quad \quad \quad \quad \quad \quad \quad \quad (B)$$Na$ $(A)$ gives a golden yellow flame in the Bunsen flame test.

Class 11 Chemistry s-Block Elements Alkali metals

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When substance $A$ reacts with water,it produces a combustible gas $B$ and a solution of substance $C$ in water. When another substance $D$ reacts with solution $C$,it produces the same gas $B$,even when reacting with dilute sulfuric acid at room temperature. $A$ gives a golden yellow flame in a Bunsen burner flame. What are $A, B, C,$ and $D$ respectively?

A
$Na, H_2, NaOH$ and $Zn$
B
$K, H_2, KOH$ and $Al$
C
$Ca, H_2, Ca(OH)_2$ and $Sn$
D
$CaC_2, C_2H_2, Ca(OH)_2$ and $Fe$

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Class 11 Questions

Class 11

Chemistry Questions

Chapter

s-Block Elements

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Alkali metals

What is the correct order of stability for the superoxides?

Medium

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Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R:$
Assertion $A:$ Metallic sodium dissolves in liquid ammonia giving a deep blue solution,which is paramagnetic.
Reason $R:$ The deep blue solution is due to the formation of amide.
In the light of the above statements,choose the correct answer from the options given below:

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The solubility of metal halides depends on their nature,lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals,the lowest solubility of $LiF$ in water is due to

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Assertion : $K$,$Rb$ and $Cs$ (all belonging to group $1$) can also form superoxides.
Reason : The ionic radii of $K$,$Rb$ and $Cs$ show the following trend $Cs^{+} < Rb^{+} < K^{+}$.

DifficultAIIMS 2014

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Which metal element is not solid at room temperature?

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What is the correct order of stability for the superoxides?

The solubility of metal halides depends on their nature,lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals,the lowest solubility of $LiF$ in water is due to

Assertion : $K$,$Rb$ and $Cs$ (all belonging to group $1$) can also form superoxides.Reason : The ionic radii of $K$,$Rb$ and $Cs$ show the following trend $Cs^{+} < Rb^{+} < K^{+}$.

Which metal element is not solid at room temperature?

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Assertion : $K$,$Rb$ and $Cs$ (all belonging to group $1$) can also form superoxides.
Reason : The ionic radii of $K$,$Rb$ and $Cs$ show the following trend $Cs^{+} < Rb^{+} < K^{+}$.