Some Basic Concepts of Chemistry Test

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Some Basic Concepts of Chemistry Test - 3

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Question 1
1 / -0

In a homogeneous mixture,the components are

A
do not mix with each other and its composition is uniform throughout.

B
completely mixed with each other and its composition is uniform through out

C
completely mix with each other and its composition is not uniform throughout

D
do not mix with each other and its composition is not uniform throughout

Solution

In a homogeneous mixture,

(i) the components are mixed together completely ,
(ii) has a uniform composition throughout.
Question 2
1 / -0

SI units for Base Physical Quantities of length, mass and current are

A
meter, gram, ampere

B
decimetre, kilogram, ampere

C
meter, kilogram, candela

D
meter, kilogram, ampere

Solution

The International System of units ( abbreviated as SI ) is modern form of metric system , and is most widely used form of measurements .

It comprises of a coherent system of measurement built of seven base units .

The base units for length , mass and current in this system of measurements are , " meter , kilogram , ampere " ,symbolised respectively as as m ,kg , A
Question 3
1 / -0

NH₃ obtained from different sources always contains nitrogen and hydrogen in the ratio 1 : 3. This is in accordance with

A
law of multiple proportions

B
law of reciprocal proportions

C
law of definite proportions

D
law of conservation of mass
Question 4
1 / -0

Particles of compounds are

A
heterogeneous mixtures .

B
atoms

C
molecules of two or more atoms of different elements

D
homogeneous mixtures .

Solution

Compounds are made when

atoms of two or more different elements combine together in fixed ratio to form molecules .(viz. water , ammonia , carbon- di- oxide glucose etc. ).

Thus the particles of compound consists of molecules.
Question 5
1 / -0

The mass of 2.6 moles of sulphur dioxide is

A
123.5 g

B
166.4 g

C
75.5 g

D
50.9 g
Question 6
1 / -0

Atomic mass of carbon is 12 u. One atom of magnesium is twice as heavy as one carbon atom. What is the atomic mass of magnesium?

A
6 u

B
6 g

C
24 u

D
24 g
Question 7
1 / -0

Fill up the blank with suitable word in the statement,

" Physical properties are those properties which are measured or observed--------------- changing the identity or the composition of the substance ."

A
without

B
with

C
by

D
after

Solution

A substance is identified by its composition , hence for measuring physical properties of a substance its identity must be retained , (or should not be changed ) Hence , the given statement ,

" Physical properties are those properties which are measured or observed without changing the identity or composition of the substance."
Question 8
1 / -0

Which among the following illustrates the law of reciprocal proportions?

A
H₂O and H₂O₂

B
SO₂ and SO₃

C
CH₄, CO₂ and H₂O

D
None of these
Question 9
1 / -0

Volume of CO₂ obtained from complete decomposition of 126 g of CaCO₃ at STP is

A
2.24 litres

B
28.22 litres

C
20 litres

D
22.4 litres
Question 10
1 / -0

Precision and Accuracy refer to _______ of various measurements for the same quantity repeatedly and agreement of a particular value to the ------- -------- of the result , respectively.

A
closeness, other values

B
closeness, true value

C
maximum, true value

D
minimum, true value

Solution

Precision means closeness of all the data values measured while accuracy means closeness of particular value with the real value.

For example,

when the reported values are 2.01, and 1.99 g as the result and its true value is 2.00 g.
These values are both precise and accurate.

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Re-Attempt Weekly Quiz Competition

Some Basic Concepts of Chemistry Test - 3

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Some Basic Concepts of Chemistry Test - 3

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Question 1

do not mix with each other and its composition is uniform throughout.

completely mixed with each other and its composition is uniform through out

completely mix with each other and its composition is not uniform throughout

do not mix with each other and its composition is not uniform throughout

Solution

Question 2

meter, gram, ampere

decimetre, kilogram, ampere

meter, kilogram, candela

meter, kilogram, ampere

Solution

Question 3

law of multiple proportions

law of reciprocal proportions

law of definite proportions

law of conservation of mass

Question 4

heterogeneous mixtures .

atoms

molecules of two or more atoms of different elements

homogeneous mixtures .

Solution

Question 5

123.5 g

166.4 g

75.5 g

50.9 g

Question 6

6 u

6 g

24 u

24 g

Question 7

without

with

by

after

Solution

Question 8

H2O and H2O2

SO2 and SO3

CH4, CO2 and H2O

None of these

Question 9

2.24 litres

28.22 litres

20 litres

22.4 litres

Question 10

closeness, other values

closeness, true value

maximum, true value

minimum, true value

Solution

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H₂O and H₂O₂

SO₂ and SO₃

CH₄, CO₂ and H₂O