Q40 / 95 · NTA Abhyas (JEE Main) 2020 · Chemistry · s Block Elements

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 :

  • Correct answer
    A
    Na,  H2,  NaOH  and  Zn
  • B
    K,  H2,  KOH   and  Al
  • C
    Ca,  H2,  CaOH2  and  Sn
  • D
    CaC2,  C2H2,  CaOH2  and  Sn

Solution

Na( s )  +   H 2 O( l )  →  NaOH( aq )  +   1 2 H 2 ( g )   [ A ]                                                     [ C ]                             [ B ]

Zn( s )  +  2NaOH( aq )  →   NaZnO 2 ( aq )  +   H 2 ( g )   [ D ]                   [ C ]                                                                             [ B ]

Zn( s )  +   H 2 SO 4   →   ZnSO 4 ( aq )  +   H 2 ( g )                            dilute                                                              [ B ]

Hence, the correct answer is option: 'A'.

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