In the laboratory during preparation of hydrogen gas mention the changes that would occur also write the chemical reaction for the following changes.
(a) in place of zinc granules same amount of zinc Dust in is taken in test tube.
(b) instead of dilute sulphuric acid hydrochloric acid is taken.
(c) in place of zinc copper turning are taken.
(d) Sodium Hydroxide is taken in place of sulphuric acid and the
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The correct answers are as follows -
a) If the zinc granules have been replaced by the zinc dust to react with sulphuric acid, then the reaction will probably take place faster and so, the Hydrogen gas also will be evolved at a faster rate. This is because of the increase in the surface area which in turn increases the reaction rate.
b). If hydrochloric acid is used in place of Sulphuric acid, then the products formed will be hydrogen gas and zinc chloride instead of zinc sulphate. There will be no change in the reaction rate.
Zn + 2HCl → ZnCl₂ + H₂O
c). Copper is less reactive than zinc when it has to react with dilute acids. This is because copper is a noble metal and it lies in the lower reactivity series. So, if the zinc granules are replaced with copper turnings, then no reaction will occur and so, hydrogen gas will not be produced.
d). If sulphuric acid is replaced with Sodium hydroxide, then the products formed will be hydrogen gas and sodium zincate. If this mixture is heated, then hydrogen gas will be evolved at a faster rate as heating increases the rate of reaction.
Zn + 2NaOH → Na₂ZnO₂ + H₂
a) If the zinc granules have been replaced by the zinc dust to react with sulphuric acid, then the reaction will probably take place faster and so, the Hydrogen gas also will be evolved at a faster rate. This is because of the increase in the surface area which in turn increases the reaction rate.
b). If hydrochloric acid is used in place of Sulphuric acid, then the products formed will be hydrogen gas and zinc chloride instead of zinc sulphate. There will be no change in the reaction rate.
Zn + 2HCl → ZnCl₂ + H₂O
c). Copper is less reactive than zinc when it has to react with dilute acids. This is because copper is a noble metal and it lies in the lower reactivity series. So, if the zinc granules are replaced with copper turnings, then no reaction will occur and so, hydrogen gas will not be produced.
d). If sulphuric acid is replaced with Sodium hydroxide, then the products formed will be hydrogen gas and sodium zincate. If this mixture is heated, then hydrogen gas will be evolved at a faster rate as heating increases the rate of reaction.
Zn + 2NaOH → Na₂ZnO₂ + H₂
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Answer:
A . The reaction will occur faster
B. Hcl + zn -----> zncl2 + h2
C. No reaction
D. Naoh +zn -------> na2Zno2 + h2
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