Question
Read the passage given below and answer the following questions from $1$ to $5.$
Quantitative measurement of properties isreaquired for scientific investigation. Earlier, two different systems of measurement, i.e., the English System and the Metric System were being used indifferent parts of the world. The metric system, which originated in France in late eighteenth century. The SI system has seven base units. these are listed as follow.
Here, Mass of a substance is the amount of matter present in it, while weight is the force exerted by gravity on an object. Density of a substance is its amount of mass per unit volume. The mole, symbol mol, is the SI unit of amount of substance. One mole contains exactly $6.02214076 \times 10^{23}$ elementary entities. This number is the fixed numerical value of the Avogadro constant, NA, when expressed in the unit per moland is called the Avogadro number. The amount of substance, symbol $n$, of a system is a measure of the number of specified elementary entities. An elementary entity may be an atom, a molecule, an ion, an electron, any other particle or specified group of particles.There are three common scales to measure temperature - ${ }^{\circ} C$ (degree celsius), ${ }^{\circ} F$ (degree fahrenheit) and K (kelvin). Here, K is the Slunit. Generally, the thermometer with celsius scale are calibrated from $0^{\circ}$ to $100^{\circ}$, where these two temperatures are the freezing point and the boiling point of water, respectively. The fahrenheit scale is represented between $32^{\circ}$ to $212^{\circ}$.
The temperatures on two scales are related to each other by the following relationship:
$^\circ{F} = 9 (^\circ{C}) + 32$
$5$
The kelvin scale is related to celsius scaleas follows:
$K = ^\circ{C} + 273.15$
Quantitative measurement of properties isreaquired for scientific investigation. Earlier, two different systems of measurement, i.e., the English System and the Metric System were being used indifferent parts of the world. The metric system, which originated in France in late eighteenth century. The SI system has seven base units. these are listed as follow.
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Base Physical Quantities
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Unit
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1
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Length
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Metre – m
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2
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Mass
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Kilogram – kg
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3
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Time
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Second – s
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4
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Electric current
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Ampere- A
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5
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Thermodynamic Temperature
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Kelvin – K
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6
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Amount of substance
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Mole – mol
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7
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Luminous intensity
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Candela- cd
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The temperatures on two scales are related to each other by the following relationship:
$^\circ{F} = 9 (^\circ{C}) + 32$
$5$
The kelvin scale is related to celsius scaleas follows:
$K = ^\circ{C} + 273.15$
- The metric system,which originated in … in late eighteenthcentury.
- Ukraine
- German
- Russia
- France
- The SI system has …. base units.
- $7$
- $3$
- $9$
- $1$
- The symbol for SI unit of thermodynamic temperature is …
- Kelvin
- $K$
- Degree Celsius
- ${}^\circ C$
- A prefix giga equivalents to:
- $10^9$
- $10^{10}$
- $10^{11}$
- $10^{12}$
- The fahrenheit scale is represented between..
- $0^\circ F \ to\ 100^\circ F$
- $32^\circ F \ to\ 212^\circ .F$
- $15^\circ F \ to\ 373^\circ F$
For convenience, each of the above processes can be considered as two separate steps, one involving the loss of electrons and the other the gain of electrons. As an illustration, we may further elaborate one of these, say, the formation of sodium chloride. $2\text{Na}(\text{s})\rightarrow2\text{Na}^+\text{g}+2\bar{\text{e}}$ $\text{Cl}_2\text{g}+2\bar{\text{e}}\rightarrow2\text{C}\bar{\text{I}}\text{ (g)}$ Each of the above steps is called a half reaction, which explicitly shows involvement of electrons. Sum of the half reactions gives the overall reaction $2\text{Na}(\text{s})+\text{Cl}_2\text{(g)}\rightarrow2\text{Na}^+\text{CI}(\text{s})\text{ or } 2\text{NaCI}(\text{s})$ Above Reactions suggest that half reactions that involve loss of electrons are called oxidation reactions. Similarly, the half reactions that involve gain of electrons are called reduction reactions. To summarise, we may mention that Oxidation: Loss of electron(s) by any species. Reduction: Gain of electron(s) by any species. Oxidising agent: Acceptor of electron(s). Reducing agent: Donor of electron(s).
