Advertisements
Advertisements
प्रश्न
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
Advertisements
उत्तर
A catalyst either increases or decreases the rate of a chemical change but itself remains unchanged at the end of the reaction.
APPEARS IN
संबंधित प्रश्न
How do the following help in bringing about a chemical change?
heat.
Complete and balance the following chemical equations:
Zn + `"H"_2"SO"_4` `→`
(dil)
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Miscible liquids having slightly different boiling points can be separated by the
- evaporation
- distillation
- fractional distillation
- sedimentation
FILL IN THE BLANK
In a double decomposition precipitation reaction both the reactants must be ............ soluble.
Define chemical reaction.
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 + Cu
Define an electrochemical reaction.
Multiple choice:
Thermal decomposition of sodium carbonate will produce
Name: A greenish-yellow gas.
Give a chemical test to distinguish between the following gases.
SO2 and Cl2
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
State the following reaction represent oxidation or reduction.
\[\ce{Cu++->Cu}\]
________ is a chemical substance which alters the speed of a chemical reaction.
The percentage composition of Nitrogen in Ureas is ______.
The chemical formula of rust is ______.
Iron and rust are the same substances.
How would you show that the settling of curd is a chemical change?
We are advised to not to play with fireworks. Give reason.
What is thermochemical reactions?
What are the chemical reactions that occur in everyday life?
