Advertisements
Advertisements
Question
Choose the correct option from the bracket and explain the statement giving a reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
Addition of an aqueous solution of ZnSO4 to an aqueous solution of BaCl2 is an example of ______ reaction.
Advertisements
Solution
Addition of an aqueous solution of ZnSO4 to an aqueous solution of BaCl2 is an example of double displacement reaction.
Explanation:
On addition of ZnSO4 and BaCl2, the following reaction takes place:
In the reaction, the exchange of ions occurs. The reaction in which ions exchange to form a precipitate is called a double displacement reaction.
APPEARS IN
RELATED QUESTIONS
Complete and balance the following chemical equations
Na + H2 O →
TRUE \ FALSE
Copper can displace iron from iron sulphate.
What do you observe when :
an iron nail is kept in tap water for few days
Name the type of chemical reaction shown by the following equation :
Fe2O3 + 2Al → Al2O3 + 2Fe
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 spoiling of food is a chemical change which is recognized from the generation of certain ______ due to it.
Explain by writing a word equation.
Bubbles are seen on adding lemon juice to baking soda.
Give an example of a reaction where the following are involved
Electricity
Give reason for the following:
Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium dichromate.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Ammonium dichromate.
True or False. If false, give the correct answer.
Taking a glass of water and freezing it by placing it in the freezer is a chemical change.
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
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
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 an example of a chemical reaction for the following situation:
A change in colour is observed
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Write a word equation for the chemical change, if any.
The simplest method of preventing rusting of iron is to coat it with oil, grease, or paint. The reason being ______.
Chemical changes are important in our day-to-day life. Give examples.
