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Important Questions on Some Basic Concepts of Chemistry

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

The dimension of light year

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

Using the rules for significant figures, the correct answer for the expression

\frac{0.02858 \times 0.112}{0.5702}

will be:

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

What is the density of water vapour at boiling point of water?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

The edge length of a solid possessing cubic unit cell is $2 \sqrt{2} r$ (structure I), based on hard sphere model, which upon subjecting to a phase transition, a new cubic structure (structure II) having an edge length of $\frac{4 r}{\sqrt{3}}$ is obtained, where $r$ is the radius of the hard sphere. Which of the following statements is true ?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

The temperature of an object is $60 ° C .$ Its value in Fahrenheit scale is

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

The nearest star to our solar system is

4.3

light years away. The distance of this star in Parsec is (Mean distance between the earth and the sun

= 1.5 \times 10^{11} m

and one light year

= 9.46 \times 10^{15} m)

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

What is the

SI

unit of density?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

Dimensional formula for thermal conductivity is (here

K

denotes the temperature):

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

Among the following, the correct statement is :

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

The number of significant figures in

50000.020 \times 10^{- 3}

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

Experimentally it was found that a metal oxide has formula

M_{0.98} O .

Metal

M

is present as

M^{2 +}

adn

M^{3 +}

in its oxide. Fraction of the metal which exists as

M^{3 +}

would be :

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

Three successive measurements in an experiment gave the values 10.9, 11.4042 and 11.42. The correct way of reporting the average value is-

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

A beaker contains a fluid of density

ρ

\frac{k g}{m^{3}}

, specific heat

S \frac{J}{k g^{o} C}

and viscosity

η

. The beaker is filled up to height h. To estimate the rate of heat transfer per unit area

(\frac{\dot{Q}}{A})

by convection when beaker is put on a hot plate, a student proposes that it should depend on

η

(\frac{S Δ θ}{h})

and

(\frac{1}{ρ g})

when

Δ θ

(

{i n}^{o} C

) is the difference in the temperature between the bottom and top of the fluid. In that situation the correct option for

(\frac{\dot{Q}}{A})

is:

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

A hot air balloon with a payload rises in the air. Assume that the balloon is spherical in shape with diameter of

11.7 m

and the mass of the ballon and the payload (without the hot air inside) is

210 kg

Temperature and pressure of outside air are

27 ° C

and 1 atm

= 10^{5} N / m^{2}

, respectively. Molar mass of dry air is

30 g

. The temperature of the hot air inside is close to [The gas constant,

R = 831 {JK}^{- 1} {mol}^{- 1}

]

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

A student measured the length of a rod and wrote it as 3.50 cm. Which instrument did he use to measure it ?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

The time period of a body undergoing simple harmonic motion is given by

T = p^{a} D^{b} S^{c},

where

p

is the pressure,

D

is density and

S

is surface tension. The values of

a, b

and

c

respectively are

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

Which two of the following quantities are dimensionally equivalent?

(i) Force
(ii) Pressure
(iii) Young's Modulus
(iv) Energy

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

The number of significant figures in

0.00340

is _________

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

0.27 g

of a long chain fatty acid was dissolved in

100 {c m}^{3}

of hexane.

10 m L

of this solution was added dropwise to the surface of water in a round watch glass. Hexane evaporates and a monolayer is formed. The distance from edge to centre of the watch glass is

10 c m

. What is the height of the monolayer?
[Density of fatty acid

= 0.9 g c m^{- 3}; π = 3]

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>The International System of Units (SI)

The units nanometer and picometer are related as,

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Important Questions on Some Basic Concepts of Chemistry

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