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Explanation:
Chemical reactions and equations class 10 questions Answers are for students of class 10 who come under the class 10 CBSE board. With the class 10 science syllabus being vast covering topics like the Periodic classification of elements, Carbon compounds, Metals and non-metals, Acids, bases and salts, and more, it is important that a student must learn all the important questions and topics which usually tend to repeat through the years in the university papers.
That is why here we have provided Chemical reactions and equations Class 10 Questions Answers so that students can effectively improve their learning and give out a better effort for the CBSE board exam.
1. What is electrolytic decomposition? (2 marks)
Ans: The process of decomposition of any molecule using electricity is termed as electrolytic decomposition. The application of this is when we need to separate molecules which dissociate at high temperatures. One such case would be sodium chloride. Sodium Chloride dissociates at high temp but breaks apart easily on electrolytic decomposition.
2. Give two uses of quicklime. (2 marks)
Ans: Quicklime also known as calcium oxide has multiple applications. Two of them are:
Quicklime is used extensively in the process of creating cement.
Lime is used as a reagent in laboratories for dehydration, precipitation, etc.
3. What is the difference between single displacement and double displacement reactions with the help of suitable examples to help solve the same (3 marks)
Ans: A single displacement reaction is a reaction in which the one or more elements replaces another element in a compound. Whereas in a double displacement reaction, there are two exchanges of ions between compounds resulting in two new compounds.
Consider 4 elements A, B, C & D. In a single displacement reaction, the mechanism would be as follows.
AB + C -> AC + B
Wherein C & B are pure elements and are exchanged forming 2 compounds with A.
Considering the case of a double displacement reaction:
AB + CD -> AC + BD
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