Question

WRITE TRUE OR FALSE WITH REASON1. The number of atoms of each element is conserved in any chemicalreaction.2. Oxidation is the loss of electrons from a substance.3. Reduction is the gain of electrons by a substance.4. A complete chemical equation represents the reactants, products andtheir physical states symbolically.5. A magnesium ribbon burns with a dazzling flame in air (oxygen) andchanges into a white substance, magnesium oxide.6. Rusting is a double decomposition reaction.7. The reaction between nitrogen and hydrogen to give ammonia is anexample of a combination reaction.8. Action of heat on ferrous sulphate is an example of decompositionreaction.9. The formation of Na+ and Cl-ions from sodium and chlorine is anexample of a redox reaction.10. Is copper more reactive than iron.​

Answer 1

1. True (law of conservation of mass)
2. True
3. True
4. True
5. True (2Mg + O2---> 2MgO)
6. False ( Rust is formed by the redox reaction of iron and oxygen)
7. True (N2+3H2----> 2NH3)
8. True( 2FeSO4 ---> Fe2O3 + SO2 + SO2, thermal decomposition reaction)
9. True (loss and gain of electrons)
10. False( Copper is below iron in the reactivity series)

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Answer 2

Answer:

1. The number of atoms of each element is conserved in any chemical reaction.    (TRUE)

Reason: This is  for law of conservation of mass.

2. Oxidation is the loss of electrons from a substance. (TRUE)

Reason: Oxidation definition is loss of electrons from the substance.

3. Reduction is the gain of electrons by a substance. (TRUE)

Reason: Reduction definition means electron will be gained from substance.

4. A complete chemical equation represents the reactants, products and their physical states symbolically. (TRUE)

Reason: Chemical equation will be represented in the form of symbolically of their products as  Gas (g) ,Liquid (l), Aqeous solution (aq).

5. A magnesium ribbon burns with a dazzling flame in air (oxygen) and changes into a white substance, magnesium oxide. (TRUE)

Reason: Magnesium gains oxygen on heating and converted into magnesium oxide.

6. Rusting is a double decomposition reaction. (FALSE)

Reason: Rusting is redox reaction it is not double decomposition reaction.

7. The reaction between nitrogen and hydrogen to give ammonia is an example of a combination reaction. (FALSE)

Reason: IT is a exothermic reaction ,because it liberates heat during the process.

8. Action of heat on ferrous sulphate is an example of decomposition reaction. (TRUE)

Reason: Ferrous on heating gives three products and it is decomposition reaction.

9. The formation of Na+ and Cl-ions from sodium and chlorine is an example of a redox reaction. (TRUE)

Reason: The sodium atom losses electron to form sodium ion and this is a redox reaction.

10. Is copper more reactive than iron.​(FALSE)

Reason: Copper has only one electron but iron has 4 unpaired electrons. so, iron is more reactive than copper.

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