Some Basic Concepts of Chemistry Test

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Some Basic Concepts of Chemistry Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

A compound prepared by any method contains the same elements in the fixed ratio by mass. The given statement is known as:

A
Law of conservation of mass

B
Law of multiple Proportions

C
Law of definite Proportions

D
Law of reciprocal Proportions

Solution

According to the law of definite proportions, a given compound always contains exactly the same proportion of elements by mass.
Question 2
1 / -0

For the reaction 2NaN₃(s) → 2Na(s) + 3N₂ (g), how many moles of sodium azide (NaN₃) must react in order to produce 8.75 moles of nitrogen gas?

A
13.1 moles NaN₃

B
5.83 moles NaN₃

C
2.00 moles NaN₃

D
2.50 moles NaN₃

Solution

3 moles of N₂are produced from 2 moles of NaN_3.

So, 8.75 moles of N₂are produced from 5.83 moles of NaN₃.
Question 3
1 / -0

Atomic mass of bromine is 80 g. The mass of four moles of molecular bromine (Br₂) is:

A
320 g

B
40 g

C
80 g

D
640 g

Solution

Mass of one mole of Br₂is 160 g.

Hence mass of four moles of molecular bromine is 4 X 160 = 640 g.
Question 4
1 / -0

100mL of gaseous hydrogen combines with 50mL of gaseous oxygen to give 100mL of water vapours. This can be explained on the basis of:

A
Avogadro law

B
Law of multiple proportions

C
Law of definite proportions

D
Gay Lussac's law

Solution

According to Gay lussac's law when gases combine or are produced in a chemical reaction they do so in a simple ratio by volume. Thus the volumes of hydrogen and oxygen which combine together (i.e. 100ml and 50ml) bear a simple ratio of 2:1.
Question 5
1 / -0

Which law is also known as Law of constant composition?

A
Avogadro's law

B
Law of multiple proportions

C
Law of conservation of mass

D
Law of definite proportions

Solution

Law of definite proportions is also known as law of constant composition.
Question 6
1 / -0

The multiple 10^-6 has the prefix:

A
centi

B
micro

C
milli

D
mega

Solution

10^-6 has the prefix micro.

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Re-Attempt Weekly Quiz Competition

Some Basic Concepts of Chemistry Test - 2

Result

Some Basic Concepts of Chemistry Test - 2

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Question 1

Law of conservation of mass

Law of multiple Proportions

Law of definite Proportions

Law of reciprocal Proportions

Solution

Question 2

13.1 moles NaN3

5.83 moles NaN3

2.00 moles NaN3

2.50 moles NaN3

Solution

Question 3

320 g

40 g

80 g

640 g

Solution

Question 4

Avogadro law

Law of multiple proportions

Law of definite proportions

Gay Lussac's law

Solution

Question 5

Avogadro's law

Law of multiple proportions

Law of conservation of mass

Law of definite proportions

Solution

Question 6

centi

micro

milli

mega

Solution

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13.1 moles NaN₃

5.83 moles NaN₃

2.00 moles NaN₃

2.50 moles NaN₃