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Chemical properties of matter can be measured or observed without changing the identity or the composition of the substance.

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Important Questions on Some Basic Concepts of Chemistry

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Matter and its Nature

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>Matter and its Nature

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

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Matter and its Nature

A proton and an antiproton come close to each other in vacuum such that the distance between them is

10 cm .

Consider the potential energy to be zero at infinity. The velocity at this distance will be:

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Matter and its Nature

Convert $- 40 ° F$ into Celsius.

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Matter and its Nature

The units nanometer and picometer are related as,

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Matter and its Nature

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>Matter and its Nature

A particle

(m = 1 k g)

slides down a frictionless track

(A O C)

starting from rest at a point

A

(height

2 m

). After reaching

C,

the particle continues to move freely in air as a projectile. When it reaches its highest point

P

(height

1 m

), the kinetic energy of the particle (in

J

) is: (Figure drawn is schematic and not to scale; take

g = 10 m s^{- 2}

) ______________.
Question Image

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Matter and its Nature

One angstrom

(\overset{\circ}{A})

is equal to:

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Matter and its Nature

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>Matter and its Nature

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>Matter and its Nature

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>Matter and its Nature

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

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Matter and its Nature

What is the

SI

unit of density?

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Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Matter and its Nature

The dimension of light year

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Matter and its Nature

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