Chemical Reactions and Equations

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Chemical Reactions and Equations - 01

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Q1. The chemical formula of lead sulphate is *

1 point

Pb2SO4

Pb(SO4)2

PbSO4

Pb2(SO4)3

Q2. Which information is not conveyed by a balanced chemical equation? *

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Physical states of reactants and products

Symbols and formulae of all the substances involved in a particular reaction

Number of atoms/molecules of the reactants and products formed

Whether a particular reaction is actually feasible or not

Q3. Chemically rust is - *

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hydrated

only ferric oxide

hydrated ferric oxide

none of these

Q4. Which of the following gases can be used for storage of fresh sample of an oil for a long time? *

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Carbon dioxide or oxygen

Nitrogen or helium

Helium or oxygen

Nitrogen or oxygen

Q5. The electrolytic decomposition of water gives H2 and O2 in the ratio of - *

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1 : 2 by volume

2 : 1 by volume

8 : 1 by mass

1 : 2 by mass

Q6. In the decomposition of lead (II) nitrate to give lead (II) oxide, nitrogen dioxide and oxygen gas, the coefficient of nitrogen dioxide (in the balanced equation) is - *

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Q7. Fatty foods become rancid due to the process of - *

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Oxidation

Corrosion

Reduction

None of them

Q8. We store silver chloride in a dark coloured bottle because it is - *

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a white solid

undergoes redox reaction

to avoid action by sunlight

None of them

Q9. Silver article turns black when kept in the open for a few days due to formation of - *

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AgS

Ag2S

AgO

Ag2O

Q10. When crystals of lead nitrate are heated strongly in a dry test tube - *

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crystals immediately melt

a brown residue is left

white fumes appear in the tube

a yellow residue is left

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