Advertisements
Advertisements
प्रश्न
Write the chemical reaction where the following changes are observed.
Gas is evolved
Advertisements
उत्तर
\[\ce{Zn + H2SO4 -> ZnSO4 + H2}\]
APPEARS IN
संबंधित प्रश्न
Write the missing reactants and products and balance the equations.
................+ HCI `→` NaCI + `"H"_2"O"` + .........................
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction reaction is the exact opposite of
- displacement reaction
- decomposition reaction
- oxidation reaction
- none of these
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
Balance the following equation :
Fe + H2O → Fe3O4 + H2
Distinguish by heating the following in dry test tubs.
Zinc nitrate and copper nitrate.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute acid to an active metal.
State the following reaction represent oxidation or reduction.
\[\ce{Cu++->Cu}\]
Give a balanced equation for the conversion of a soluble lead salt to an insoluble lead salt – formed as a white precipitate.
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
What changes do you expect?
Acid rain is a result of ______.
