5 moles of A B 2 weigh 125 × 10 - 3 k g and 10 moles of A 2 B 2 weigh 300 × 10 - 3 k g . The molar mass of A ( M A ) and molar mass of B ( M B ) in k g m o l - 1 are:

M A = 5 × 10 - 3 and M B = 10 × 10 - 3

M A = 25 × 10 - 3 and M B = 50 × 10 - 3

M A = 50 × 10 - 3 and M B = 25 × 10 - 3

M A = 10 × 10 - 3 and M B = 5 × 10 - 3

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Molecular weight of orthophosphoric acid is $M$ . Its equivalent weight is

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Important Questions on Some Basic Concepts of Chemistry

EASY

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

What is the

SI

unit of density?

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]

EASY

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

Convert $- 40 ° F$ into Celsius.

EASY

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

The dimension of light year

HARD

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

An organic compound contains

C, H

and

S

. The minimum molecular weight of the compound containing

8 %

Sulphur is

MEDIUM

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

EASY

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

MEDIUM

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 :

EASY

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

The percentage composition of carbon by mole in methane is:

EASY

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

5

moles of

A B_{2}

weigh

125 \times 10^{- 3} k g

and

10

moles of

A_{2} B_{2}

weigh

300 \times 10^{- 3} k g

. The molar mass of A

(M_{A})

and molar mass of

B (M_{B})

k g {m o l}^{- 1}

are:

EASY

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

The units nanometer and picometer are related as,

EASY

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

The number of water molecules is maximum in

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}

]

MEDIUM

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?

EASY

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)

EASY

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:

EASY

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

One angstrom

(\overset{\circ}{A})

is equal to:

EASY

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

In which case the number of molecules of water maximum?

EASY

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

Suppose the elements

X

and

Y

combine to form two compounds

X Y_{2}

and

X_{3} Y_{2}

. When

0.1 mole

X Y_{2}

weighs

10 g

and

0.05 mole

X_{3} Y_{2}

weighs

9 g

, the atomic weights of

X

and

Y

are

MEDIUM

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

The amount of sugar

(C_{12} H_{22} O_{11})

required to prepare

2 L

of its

0 .1 M

aqueous solution is:

Molecular weight of orthophosphoric acid is M. Its equivalent weight is

Important Questions on Some Basic Concepts of Chemistry

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Molecular weight of orthophosphoric acid is $M$ . Its equivalent weight is