Advertisements
Advertisements
प्रश्न
The removal of oxygen from a substance is called ______.
पर्याय
oxidation
corrosion
reduction
rancidity
Advertisements
उत्तर
The removal of oxygen from a substance is called reduction.
Explanation:
Reduction is specifically defined as the removal of oxygen or the addition of hydrogen to a substance.
APPEARS IN
संबंधित प्रश्न
Methyl orange is used as an indicator. It shows colour change in acid, base and neutral substance. Tabulate your result as follows:
| Indicator | Colour change | Inference |
| Methyl Orange | No change | ...................... |
| .................... | Acid | |
| Yellow | ....................... |
On what basis is a chemical equation balanced?
How will you indicate the following effect in a chemical equation?
Endothermic reaction
Give one example of an exothermic reaction.
Give one example of an endothermic reaction.
Why do we need to balance chemical equations?
Balance the following equation. Also name the product formed.
K2O + H2O → KOH
Write the answer to the following.
Explain the similarity in two events, namely adding NaOH to water and adding CaO to water.
What is a chemical equation? Why it is necessary to balance it?
Write the chemical equation for the following word equation and balance them.
Calcium oxide + Carbon dioxide → Calcium carbonate
Balance the following equation:
C + H2SO4 → CO2 + H2O + SO2
Balance the following equation:
Pb3O4 + HCl → PbCl2 + H2O + Cl2
Write word equation for the following molecular equation:
CaO + H20 → Ca (OH)2 + Δ
Word equation:
State why [+ Δ ] is not written in the reaction, if ZnO reacts with H2O.
A chemical reaction is generally accompanied by certain external indications or characteristics. These include – change of – (a) colour (b) state (c) smell (d) evolution of gas (e) formation of precipitate (f) evolution or absorption of heat. With reference to change of colour – state the change in colour seen when the following are heated – lead [IV] oxide.
Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
\[\ce{2SO2 + O2 ⇌[V2O5][450°C] 2SO3}\]
Balance the following simple equation:
ZnS + O2 → ZnO + SO2
Balance the following simple equation:
K + CO2 → K2O + C
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
Na2SO3 + HCl → 2NaCl + H2O + SO2
Balance the given chemical reaction as per the instructions below.
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Write names of reactants and products of chemical reaction.
Give the characteristic tests for the following gases :
- CO2
- SO2
- O2
- H2
