Q. 74.0( 141 Votes )
Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
Zinc and iron will displace hydrogen from dilute acids because they are more reactive than hydrogen. While copper and silver cannot displace hydrogen from dilute acids because they are less reactive than hydrogen.
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i. What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube?
ii. What type of reaction is this?
iii. Write a balanced chemical equation to represent the above reaction.
A brown substance ‘X’ on heating in air forms a substance ‘Y’. When hydrogen gas is passed over heated ‘Y’, it again changes back into ‘X’.
i. Name the substance ‘X’ and ‘Y’
ii. Name the type of chemical reactions occurring during both the changes.
iii. Write the chemical equations of the reactions.Xam idea - Science