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Metallic zinc displaces hydrogen from dilute acids and water because 

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Important Questions on Practicals

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10th CBSE
IMPORTANT
Foundation Science Chemistry FOR CLASS 10>Chapter 9 - Practicals>EXERCISES>Q 66
The metal which can react both with acids and alkalis to produce hydrogen gas is 
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10th CBSE
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Foundation Science Chemistry FOR CLASS 10>Chapter 9 - Practicals>EXERCISES>Q 67
When zinc powder is heated with sodium hydroxide solution, the substances formed are 
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10th CBSE
IMPORTANT
Foundation Science Chemistry FOR CLASS 10>Chapter 9 - Practicals>EXERCISES>Q 68
When a piece of zinc is added to blue copper sulphate solution, the solution becomes 
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10th CBSE
IMPORTANT
Foundation Science Chemistry FOR CLASS 10>Chapter 9 - Practicals>EXERCISES>Q 69
The order of reactivity of Zn, Fe, Al and Cu is
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10th CBSE
IMPORTANT
Foundation Science Chemistry FOR CLASS 10>Chapter 9 - Practicals>EXERCISES>Q 70

A piece of granulated zinc was dropped into CuSO4 solution. After some time, the colour of the solution changed from 

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10th CBSE
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Foundation Science Chemistry FOR CLASS 10>Chapter 9 - Practicals>EXERCISES>Q 71
Four set-ups as given below were arranged to identify the gas evolved when dilute HCI was added to zinc granules. The most appropriate set-up is
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10th CBSE
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Foundation Science Chemistry FOR CLASS 10>Chapter 9 - Practicals>EXERCISES>Q 72
When an iron rod is dipped into a solution of copper sulphate, copper is displaced. This is because
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10th CBSE
IMPORTANT
Foundation Science Chemistry FOR CLASS 10>Chapter 9 - Practicals>EXERCISES>Q 73

The reaction BaCl2+Na2SO4 →BaSO4+2NaCl is an example of a