Chemistry XII - Some Basic Concepts in Chemistry 05

Question : 1

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Options:

	8.40 g
	10.20 g
	9.50 g
	6.50 g

Solution :

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Question : 2

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In the reaction A + B₂ → AB₂, 300 atoms of A + 200 molecules of B are present. The limiting reagent is

Options:

	A is the limiting reagent
	B is the limiting reagent
	May be A or B
	Neither A nor B.

Solution :

According to the given reaction, 1 atom of
A reacts with 1 molecule of B. Therefore,
200 molecules of B will react with 200
atoms of A and 100 atoms of A will remain
unreacted or excess.

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Question : 3

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If 30 ml of H₂ and 20 ml of O₂ react to form H₂O, which out of the following is left at the end of the reaction?

Options:

	10 ml of H2
	5 ml of H2
	10 ml of O2
	5 ml of O2

Solution :

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Question : 4

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The mass of iron which will be converted into its oxide (Fe₃O₄) by the action of 18 g of steam on it is

Options:

	32 g
	30 g
	42 g
	40 g

Solution :

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Question : 5

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The drain cleaner, drainex contains small bits of Aluminium which reacts with caustic soda to produce dihydrogen. The volume of dihydrogen at 20°C and 1 bar pressure; that will be released when 0.15 g of Al reacts

Options:

	203.0 ml
	250.0 ml
	303.0 ml
	450.0 ml

Solution :

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Question : 6

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Magnetic oxide (Fe₃O₄) when heated with hydrogen is reduced to iron and H₂O is also produced. Number of moles of H₂ needed for the reaction is

Options:

	One
	Two
	Three
	Four

Solution :

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Question : 7

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50.0 kg of N₂ (g) and 10.0 kg of H₂ (g) are mixed to produce NH₃ (g). The limiting reagent in the reaction is

Options:

	N2 is the limiting reagent
	N2 or H2 is the limiting reagent
	H2 is the limiting reagent
	Neither H2 nor N2 is limiting in the reaction

Solution :

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Question : 8

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3.0 g of H₂ reacts with 29.0 g of O₂ to form H₂O. The maximum amount of H₂O formed in the reaction is

Options:

	27.0 g
	30.2 g
	34.8 g
	23.2 g

Solution :

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Question : 9

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If 20.0 g of CaCO₃ is treated with 20.0 g of HCl, the amount of CO₂ produced in the reaction and the limiting reagent are

Options:

	9.20 g, HCl
	8.80 g, CaCO3
	8.80 g, HCl
	9.20 g, CaCO3

Solution :

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Question : 10

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Limiting reagent in a chemical reaction

Options:

	Reacts completely in the reaction
	Decides the amount of product formed
	Decides the amount of other reactants reacted
	All of these

Solution :

Limiting reagent in the one which gets
consumed in the reaction faster, i.e., reacts
completely and decides the amount of
product formed.