Advertisements
Advertisements
प्रश्न
Give a word equation for the following reaction.
Two gases which combine to give a solid.
उत्तर
Ammonia + Hydrogen chloride→ Ammonium chloride
NH3 (g) + HCl (g)→NH4Cl (s)
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equations:
N2 + O2 →
Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.
\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
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
A new substance is always formed in a _______ change.
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
Copper carbonate when heated, it turns :
When electric current is passed through acidulated water ______ of water takes place.
What do you understand by precipitation reaction? Explain with examples.
Define:
Photochemical reaction
Give one example
State the original colour of the following substance and colour of residue obtained after heating.
Lead nitrate
Distinguish by heating the following in dry test tubs.
Zinc carbonate, Copper carbonate and lead carbonate.
Select the correct answer for the following options:
The gas which reacts with oxygen to give a neutral liquid.
What is a chemical reaction?
State the following reaction represent oxidation or reduction.
\[\ce{Cl- ->Cl}\]
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Calcium hydroxide.
Circle the odd one out. Give reason for your choice
The chemical change is ______.
Silver articles turning black: ______:: Boiling of H2O: physical change ______.
______ change results in the change of the substance.
On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.
(a) Is this a physical or a chemical change?
(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.
Which of the following is a chemical change?
Rusting of iron is ______.
______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.
The chemical name of baking soda is sodium bicarbonate.
How would you show that the settling of curd is a chemical change?
How can we prevent rusting?
Write a note on the catalyst.
