NTA Abhyas 2020
Exam NTA Abhyas
Year 2020
Subject Chemistry
Chapter s Block Elements NTA Abhyas 2020 · Chemistry · s Block Elements
When a substance, A reacts with water, it produces a combustible...
When a substance, A reacts with water, it produces a combustible gas B and a solution of a substance, C in water. When another substance, D reacts with this solution of C, it also produces the same gas, B on warming, but D can produce B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden-yellow colour to a smokeless flame of Bunsen burner. A, B, C and D respectively are :
Options A N a , H 2 , N a O H a n d Z n Na, {H}_{2}, NaOHandZn N a , H 2 , N a O H an d Z n B K , H 2 , K O H a n d A l K, {H}_{2}, KOHandAl K , H 2 , K O H an d A l C C a , H 2 , C a ( O H ) 2 a n d S n Ca, {H}_{2}, Ca\left(OH\right)2andSn C a , H 2 , C a ( O H ) 2 an d S n D C a C 2 , C 2 H 2 , C a ( O H ) 2 a n d S n {CaC}_{2}, {C}_{2}{H}_{2}, Ca\left(OH\right)2andSn C a C 2 , C 2 H 2 , C a ( O H ) 2 an d S n Correct answer A. N a , H 2 , N a O H a n d Z n Na, {H}_{2}, NaOHandZn N a , H 2 , N a O H an d Z n
Step-by-step solution
Na ( s ) + H 2 O ( l ) → NaOH ( aq ) + 1 2 H 2 ( g ) [ A ] [ C ] [ B ] \begin{array}{ll}\text{Na}( \text{s} ) + {H}_{2} \text{O}( \text{l} ) \to \text{NaOH}( \text{aq} ) + \dfrac{1}{2} {H}_{2} ( \text{g} ) \\ [ \text{A} ][ \text{C} ][ \text{B} ]\end{array} Na ( s ) + H 2 O ( l ) → NaOH ( aq ) + 2 1 H 2 ( g ) [ A ] [ C ] [ B ] Zn ( s ) + 2NaOH ( aq ) → N a Z n O 2 ( aq ) + H 2 ( g ) [ D ] [ C ] [ B ] \begin{array}{ll}\text{Zn}( \text{s} ) + \text{2NaOH}( \text{aq} ) \to {NaZnO}_{2} ( \text{aq} ) + {H}_{2} ( \text{g} ) \\ [ \text{D} ][ \text{C} ][ \text{B} ]\end{array} Zn ( s ) + 2NaOH ( aq ) → N a Z n O 2 ( aq ) + H 2 ( g ) [ D ] [ C ] [ B ] Zn ( s ) + H 2 S O 4 → Z n S O 4 ( aq ) + H 2 ( g ) dilute [ B ] \begin{array}{ll}\text{Zn}( \text{s} ) + {H}_{2} {SO}_{4} \to {ZnSO}_{4} ( \text{aq} ) + {H}_{2} ( \text{g} ) \\ \text{dilute}[ \text{B} ]\end{array} Zn ( s ) + H 2 SO 4 → Z n SO 4 ( aq ) + H 2 ( g ) dilute [ B ]
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