Some Basic Concepts of Chemistry Test

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Some Basic Concepts of Chemistry Test - 1

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Question 1
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According to Avogadro Law equal volumes ofall gases at the same temperature and pressure should contain ---------- number of molecules .

A
unequal

B
similar

C
different

D
equal

Solution

Explanation:

Avogadro's law states that " equal volumes of all gases at same temperature and pressure contain equal number of molecules. "
Question 2
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According to Gay Lussac’s Law of Gaseous Volumes,

when gases combine or are produced in a chemical reaction they do so in a ______ ratio by volumes provided all gases are at same temperature and pressure.

A
simple

B
inverse

C
equal

D
uncertain

Solution

Explanation:

Gay lussac’s law states that when gases combine or are produced in a chemical reaction they do so in a simple ratio by volume provided all gases are at same temperature and pressure.

Mathematically , the law is expressed as ,

[ V / n ] = k

where V represents volume of the gas , n denotes number of moles of the gas & k is proportionality constant .

Thus, volume ratio must be related to the relative number of molecules.

This relationship was crucial in establishing the formula of simple molecules at a time when a distinction between atoms and molecules was not clearly understood.
Question 3
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Significant figures are

A
first three digits after the decimal point

B
digits after the decimal point

C
digits before the decimal point

D
meaningful digits which are known with certainty

Solution

Explanation:

Significant digits are certain digits that have significance or meaning to certain digits in a number . Such digits help scientists to use them with more precise information about measurement and other numeric data. These digits also help them in rounding off very large or very small number
Question 4
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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
minimum , true value

B
maximum , true value

C
closeness , true value

D
closeness , other values

Solution

Explanation:

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 truevalue is 2.00 g .

These values are both precise and accurate.
Question 5
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In scientific notation for numbers, any number can be represented in the form ,

N × 10ⁿwhere,

A
n is an exponent having positive or negative values and N can vary from 0 to 1

B
n is an exponent having positive or negative values and N can vary from 10 to 100

C
n is an exponent having positive or negative values . N represents a number which can vary from 1 to 10 , but not 10 itself .

D
n is an exponent having positive values only and N can vary from 1 to 10

Solution

Explanation:

Scientific notation is conveniently used to represent extremely large or even very small numerical values . It is an exponential notation in which any number can be represented in the form , N x 10ⁿ , where n is an exponent having positive or negative values and N can vary between 1 and 10 , but not 10 itself.
Question 6
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The kelvin scale is related to celsius scale as :

A
K = °C + 100

B
K = °C + 32

C
K = °C + 273.15

D
K = °C + 212

Solution

Explanation:

The relation between Kelvin scale & Celcius scale of temperatures is -

K = °C + 273.15

Such a relation is based upon the experimental findings and subsequent conclusion of Charle's law .

The Kelvin scale is also termed as " absolute scale of temperature."

It is interesting to note that temperature below 0^o C ( ie. negative values ) are possible in Celcius scale but in Kelvin scale , negative temperature is not possible .
Question 7
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SI units for Base Physical Quantities of length, mass and current are

A
meter, kilogram, candela

B
meter, gram, ampere

C
decimetre, kilogram, ampere

D
meter, kilogram, ampere

Solution

Explanation:

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 8
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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
with

B
without

C
by

D
after

Solution

Explanation:

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."

is correct.
Question 9
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Particles of compounds are

A
atoms

B
heterogeneous mixtures .

C
molecules of two or more atoms of different elements

D
homogeneous mixtures .

Solution

Explanation:

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 10
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Which of the following statements about pure substances is correct ?

A
Pure substances have fixed composition.

B
Pure substances are compounds only

C
Pure substances are elements only.

D
Pure substances do not have fixed composition .

Solution

Explanation:

Pure substances have fixed composition..These may be both (ie. either elements or compounds ) . The law of constant composition holds good for such substances

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Some Basic Concepts of Chemistry Test - 1

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Question 1

unequal

similar

different

equal

Solution

Question 2

simple

inverse

equal

uncertain

Solution

Question 3

first three digits after the decimal point

digits after the decimal point

digits before the decimal point

meaningful digits which are known with certainty

Solution

Question 4

minimum , true value

maximum , true value

closeness , true value

closeness , other values

Solution

Question 5

n is an exponent having positive or negative values and N can vary from 0 to 1

n is an exponent having positive or negative values and N can vary from 10 to 100

n is an exponent having positive or negative values . N represents a number which can vary from 1 to 10 , but not 10 itself .

n is an exponent having positive values only and N can vary from 1 to 10

Solution

Question 6

K = °C + 100

K = °C + 32

K = °C + 273.15

K = °C + 212

Solution

Question 7

meter, kilogram, candela

meter, gram, ampere

decimetre, kilogram, ampere

meter, kilogram, ampere

Solution

Question 8

with

without

by

after

Solution

Question 9

atoms

heterogeneous mixtures .

molecules of two or more atoms of different elements

homogeneous mixtures .

Solution

Question 10

Pure substances have fixed composition.

Pure substances are compounds only

Pure substances are elements only.

Pure substances do not have fixed composition .

Solution

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