Advertisements
Advertisements
प्रश्न
Give a word equation for the following reaction.
An exothermic reaction where both the reactants are gases, one of which is oxygen.
उत्तर
Hydrogen + Oxygen → water
2H2(g) + O2(g) → H2O(l)
APPEARS IN
संबंधित प्रश्न
The chemical name of baking soda is ______.
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
What do you observe when Iron nail is kept in copper sulphate solution for sometime.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Compounds, which in their molten state allow an electric current to pass through them are called
- electrolytes
- non-electrolytes
- non-conductors
- none of these
TRUE \ FALSE
Ammonia is a good oxidizing agent.
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
Balance the following equation :
Fe + H2O → Fe3O4 + H2
Name the type of chemical reaction shown by the following equation:
CaCO3 → CaO + CO2
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
To prevent rusting, a layer of ______ metal is applied on iron sheets.
State the conditions necessary for a chemical change or reaction.
Give an example of a reaction where the following are involved
Electricity
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
Complete and balance the following reaction:
NaCl(aq) + AgNO3(aq) →
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.
Ammonium Chloride and iodine.
Write your observation and a balanced equation in the case of the following substances being heated.
Zinc carbonate.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc nitrate to nitrogen dioxide
Give a balanced equation for the conversion of an ammonium salt to a basic gas.
Mention the various conditions required for a chemical reaction to occur.
Burning of paper is the best example of ______ change.
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
A chemical change may involve –
Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.
Rusting of iron is ______.
Magnesium + oxygen → magnesium oxide.
2Mg + O2 → 2Mg O
Photosynthesis is a chemical charge. Justify your answer.
______ is the chemical name of limestone.
