Geo-Scientist Prelims 2026 Chemistry Q49: Which of the following is/are correct when 131 g of zinc is allowed…

Which of the following is/are correct when 131 g of zinc is allowed to react with hydrochloric acid at 27°C ? (Given : Molar mass of Zn is 65·4 g mol⁻¹ and R = 8·3 J K⁻¹ mol⁻¹)

1. The reaction involved is Zn + 2 HCl → ZnCl₂ + H₂
2. When the reaction mixture is kept in a closed vessel of fixed volume, work done is zero
3. When the reaction mixture is kept in an open vessel, the reaction mixture does 4·98 kJ of work driving back the atmosphere

Select the answer using the code given below :

1. (a) 1 and 2 only
2. (b) 3 only
3. (c) 1 and 3 only
4. (d) 1, 2 and 3