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Question
Write true or false :
No new substance is formed during a chemical reaction.
Options
True
False
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Solution
False
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The chemical name of baking soda is ______.
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
Balance the following equation :
Fe + H2O → Fe3O4 + H2
Match the pairs.
| a. | Photosynthesis | i. | Tendency to lose electrons |
| b. | Water | ii. | Reactant in combustion process |
| c. | Sodium chloride | iii. | Chemical change |
| d. | Dissolution of salt in water | iv. | Covalent bond |
| e. | Carbon | v. | Ionic bond |
| f. | Fluorine | vi. | Physical change |
| g. | Magnesium | vii. | Tendency to form anion |
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Hydrogen chloride
Write the chemical reaction where the following changes are observed.
Gas is evolved
Write the chemical reaction where the following changes are observed.
Colour change is noticed
State the type of reactions for the following represent and balance the ones that are not balanced.
NaOH + HCl → NaCl + H2O
State the original colour of the following substance and colour of residue obtained after heating.
Lead nitrate
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium chloride
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
Give balanced equation for the following conversion affected by heat alone on the substance:
Ammonium dichromate to nitrogen
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Copper nitrate.
Circle the odd one out. Give reason for your choice
______ gas causes tears in our eyes while cutting onions.
The changes in which new substance with new chemical properties are formed are ______.
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
Galvanization is a process in which ______ is coated as a layer of iron.
______ is the chemical name of rust.
Acid rain is a result of ______.
