Advertisements
Advertisements
प्रश्न
Fill in the blank
A new substance is always formed in a _______ change.
Advertisements
उत्तर
A new substance is always formed in a chemical change.
APPEARS IN
संबंधित प्रश्न
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
TRUE \ FALSE
Ammonia is a good oxidizing agent.
Write true or false :
No new substance is formed during a chemical reaction.
Explain the following reaction with one suitable example of Combination reactions .
Name the type of chemical reaction shown by the following equation:
NaOH + HCl → NaCl + H2O
Name the type of chemical reaction shown by the following equation :
Fe2O3 + 2Al → Al2O3 + 2Fe
Complete the statement by filling the gap using an appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
An ______ is drawn in between the reactants and products while writing the equation for a chemical reaction.
Explain by writing a word equation.
Respiration is a chemical change.
Give an example of a reaction where the following are involved
Pressure
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.
Multiple choice:
Which of the following is not a characteristic of a chemical change?
Multiple choice:
Thermal decomposition of sodium carbonate will produce
Give a chemical test to distinguish between the following gases.
H2 and CO2
Distinguish by dilute sulphuric acid.
Copper and magnesium?
Distinguish by dilute sulphuric acid.
Sodium sulphide and sodium sulphite?
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Copper nitrate.
Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.
Write a note on the catalyst.
