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Which of the following is not a unit of pressure:

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Important Questions on Some Basic Concepts of Chemistry

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Properties of Matter and their Measurement

The angular diameter of a planet measured from earth is

90 " .

If the diameter of the planet is

π \times 10^{6} m,

then its distance from the earth is

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Properties of Matter and their Measurement

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>Properties of Matter and their Measurement

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

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Properties of Matter and their Measurement

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>Properties of Matter and their Measurement

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

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Properties of Matter and their Measurement

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>Properties of Matter and their Measurement

What is the

SI

unit of density?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Properties of Matter and their Measurement

Given below are two statements :
Statement I : Astronomical unit (Au), Parsec (Pc) and Light year (ly) are units for measuring astronomical distances.
Statement II : Au < Parsec (Pc) < ly
In the light of the above statements, choose the most appropriate answer from the options given below:

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Properties of Matter and their Measurement

Among the following, the correct statement is :

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Properties of Matter and their Measurement

The number of significant figures in

50000.020 \times 10^{- 3}

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Properties of Matter and their Measurement

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>Properties of Matter and their Measurement

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>Properties of Matter and their Measurement

One angstrom

(\overset{\circ}{A})

is equal to:

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Properties of Matter and their Measurement

The dimension of light year

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Properties of Matter and their Measurement

Convert $- 40 ° F$ into Celsius.

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Properties of Matter and their Measurement

The number of significant figures in

0.00340

is _________

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Properties of Matter and their Measurement

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>Properties of Matter and their Measurement

The units nanometer and picometer are related as,

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Properties of Matter and their Measurement

A piece of metal is

3

inch (represented by in) long. What is its length in cm?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Properties of Matter and their Measurement

What is the SI prefix for the following multiple of a unit?

$10^{3}$

Which of the following is not a unit of pressure:

Important Questions on Some Basic Concepts of Chemistry

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