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प्रश्न
Give a word equation for the following reaction.
An exothermic reaction where both the reactants are gases, one of which is oxygen.
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उत्तर
Hydrogen + Oxygen → water
2H2(g) + O2(g) → H2O(l)
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संबंधित प्रश्न
Changes in which new substances are formed are called ______ changes.
The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A), then it burns (Change − B). The following statements pertain to these changes. Choose the correct one.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction is a chemical reaction in which there is
- removal of hydrogen
- removal of oxygen
- addition of oxygen
- none of these
FILL IN THE BLANK
In a double decomposition precipitation reaction both the reactants must be ............ soluble.
TRUE \ FALSE
The evolution of a gas during a chemical reaction is shown by an arrow pointing downwards. True or false ?
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
What are homogenous reactions ?
Multiple choice:
Thermal decomposition of sodium carbonate will produce
Complete and balance the following reaction:
\[\ce{NH3 + O2 ->[\Delta]}\]
Complete the table given below.
| Heat on sodium chloride | Colour imparted to flame during flame test |
Select the correct answer from the options given below:
State the gaseous product formed, when
An active metal reacts with dilute sulphuric acid.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Ammonium dichromate.
A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?
The water we drink is a combination of hydrogen and oxygen.
Classify the following as physical or chemical properties
Most metal oxides form alkalis on interacting with water.
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change the colour of black tea by adding lemon juice to it.
(e) Churning of milk cream to get butter.
Explain how the painting of an iron gate prevents it from rusting.
When milk is mixed with coffee decoction, the colour of milk and decoction changes due to ______.
What is the difference between reactants and products?
