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प्रश्न
Complete and balance the following chemical equations:
N2 + O2 →
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उत्तर
N2 + O2 → 2NO(g)
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
catalyst .
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
Give reason .
A person suffering from acidity is advised to take an antacid.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
FILL IN THE BLANK
The new substances formed during a chemical reaction are called the ..................
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
Copper carbonate when heated, it turns :
Explain by writing a word equation.
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Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Hydrogen chloride
Name: Gas with rotten egg smell.
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
Distinguish by heating the following in dry test tubs.
Zinc carbonate, Copper carbonate and lead carbonate.
Give a word equation for the following reaction.
An exothermic reaction where both the reactants are gases, one of which is oxygen.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A white solid which evolves two colourless gases which on cooling combine and condense on the cooler parts of the test tube.
Complete the table given below.
| Heat on iodine crystals | Colour of vapours evolved |
State the following reaction represent oxidation or reduction.
\[\ce{Ag->Ag+}\]
Which of the following is not an “element + element → compound” type reaction?
A chemical change may involve –
Which is used as a catalyst during the process of hydrogenation of oils?
