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प्रश्न
Select the correct answer for the following options:
The gas which reacts with oxygen to give a neutral liquid.
पर्याय
Hydrogen
Copper [II] oxide
Oxygen
Copper [II] hydroxide
Ammonia
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उत्तर
Ammonia
APPEARS IN
संबंधित प्रश्न
How do the following help in bringing about a chemical change?
heat.
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 or false
New substances are formed in a chemical change.
Explain the following reaction with one suitable example of Double decomposition reaction.
Complete the statement by filling the gaps using 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)
The white particles of baking soda disappear when put in lemon juice. This means that it is a ______ change.
Explain by writing a word equation.
Limestone powder disappears on adding to dilute hydrochloric acids.
Give an example of the following chemical change.
A reaction where colour change is noticed
State the original colour of the following substance and colour of residue obtained after heating.
Lead nitrate
Give a chemical test to distinguish between the following gases.
H2 and CO2
Give a chemical test to distinguish between the following gases.
H2 and O2
Give balanced equation for the following conversion affected by heat alone on the substance:
Hydrated copper sulphate to sulphur dioxide
Complete the table given below.
| Heat on sodium chloride | Colour imparted to flame during flame test |
What kind of a change is associated with decaying of a plants?
Water boiling into water vapour is an example of chemical change.
Write some materials prepared by chemical changes.
Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood
Vanaspati is obtained from vegetable oils by the addition of ______ to the oils.
Write the characteristics of chemical change.
Photosynthesis is a chemical charge. Justify your answer.
When carbon dioxide is passed through lime water ______.
