Question

1) _______ is burnt in air to form
magnesium oxide.

2) Pb + CuCl2 -----> _______ + Cu .

3) It is necessary to balanced a chemical equation in order to satisfy the law of equation in order to satisfy the law of ?

4) Reactions in which energy is given out are know as _______ .

5) The following reaction is used for the preparation of oxygen gas in the laboratory : Which of the following statement about the reaction is correct.

2KCl O3 (s) heat--------> 2KCl +3O2 (g)
i) It is a decomposition reaction and accompanied by release of heat .

ii) It is a combination reaction

iii) It is a Photochemical decomposition reaction and exothermic in nature

iv) It is a decomposition reaction and endothermic in nature.



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Answer 1

Answer:

1. Magnesium metal is burnt

Answer 2

Answer:

1) magnesium

2) 2pbcl

3) law of conservation of mass

4) exothermic reactions

5) It is a decomposition reaction and accompanied by release of heat

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