Question

'X' on reacting with a dilute acid releases a gas 'Y'. Gas 'Y' burns with a pop sound. Which of the following best describes 'X' and 'Y'?

• A. X = Metal carbonate/bicarbonate
  Y = Hydrogen
• B. X = Metal carbonate/bicarbonate
  Y = Carbon dioxide
• C. X = Metal
  Y = Hydrogen
• D. X = Metal
  Y = Carbon dioxide

Answer 1

The correct option is C X = Metal

Y = Hydrogen
Metal carbonate/bicarbonate + Acid → Salt + Water + Carbon dioxide gas

Metal + Dilute acid → Salt + Hydrogen gas ​

Moreover, hydrogen gas burns with a pop sound.​

Therefore,
​X = Metal
Y = Hydrogen