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Homework Assignment: 20 | Class 10 BBC Compacta Solutions PDF Download

(A) The underlined parts of the following dialogue /text may or may not have an error. Choose the option that best replaces the underlined parts(s). You may choose 'no error' if no change is required in the underlined part(s).

1.
Ans: (c) may, would 

2.
Ans: (a) no error, can

3.
Ans: (b) should, no error, will

4.
Ans: (d) no error, will, must, will


(B) Choose the option that completes the following dialogue/text correctly.
1.
Ans: (b) used to, won't

2.
Ans: (d) shall, will

3.
Ans: (c) would, can't

4.
Ans: (a) will, can


(C) 
1.
Ans: (c) We can see the lake from our hotel room.

(D)
1.
Ans: (b) The phone is ringing. It must be Helena.

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FAQs on Homework Assignment: 20 - Class 10 BBC Compacta Solutions

1. What are the different types of chemical reactions?
Ans. The different types of chemical reactions include synthesis, decomposition, single displacement, double displacement, combustion, and redox reactions.
2. How can you balance a chemical equation?
Ans. To balance a chemical equation, you must adjust the coefficients of the reactants and products so that the number of atoms of each element is the same on both sides of the equation.
3. What is the Law of Conservation of Mass in chemistry?
Ans. The Law of Conservation of Mass states that mass cannot be created or destroyed in a chemical reaction; it can only be rearranged from reactants to products.
4. How do you classify chemical reactions based on energy changes?
Ans. Chemical reactions can be classified as exothermic (release heat energy) or endothermic (absorb heat energy) based on the direction of energy transfer during the reaction.
5. What is the difference between a reversible and irreversible chemical reaction?
Ans. In a reversible chemical reaction, the products can react to form the original reactants, while in an irreversible reaction, the products cannot convert back to the reactants under the same conditions.
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