Advertisements
Advertisements
प्रश्न
Write true or false :
When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .
विकल्प
True
False
Advertisements
उत्तर
False
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equations:
N2 + O2 →
Give reason .
A person suffering from acidity is advised to take an antacid.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Miscible liquids having slightly different boiling points can be separated by the
- evaporation
- distillation
- fractional distillation
- sedimentation
FILL IN THE BLANK
In a double decomposition precipitation reaction both the reactants must be ............ soluble.
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
Complete and balance the following reaction:
\[\ce{CuCO3 ->[\Delta]}\]
Name: Two carbonates do not produce carbon dioxide on heating.
Name: A brown gas
Write your observation and a balanced equation in the case of the following substances being heated.
Copper carbonate.
Give reason for the following:
Even though rusting is an exothermic reaction, the heat evolved when an iron nail rusts is unnoticeable.
Complete the table given below.
| Heat on ammonium dichromate | Name of neutral gas evolved |
The chemical change is ______.
Explain the following statement: Digestion is a chemical change.
When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.
Two chemical species X and Y combine together to form a product P which contains both X and Y
\[\ce{X + Y -> P}\]
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition
Write word equations for two chemical reactions with the help of materials given in the box.
| Air, copper sulphate, iron, vinegar, iron oxide, carbon dioxide, iron sulphate, copper, lime water, water |
Give two examples for the following case:
Chemical changes
The reaction of H2 gas with oxygen gas to form water is an example of ______.
______ is the chemical name of slaked lime.
Write the effects of chemical reactions.
