EASY
Earn 100
Helium gas is a matter because:
52.94% studentsanswered this correctly
Important Questions on Some Basic Concepts of Chemistry
EASY
One angstrom is equal to:
EASY
The temperature of an object is Its value in Fahrenheit scale is
MEDIUM
Experimentally it was found that a metal oxide has formula Metal is present as adn in its oxide. Fraction of the metal which exists as would be :
HARD
At consider the density of water is and that of propanol to be . What volume of propanol will have same number of molecules as present in of water?
EASY
The units nanometer and picometer are related as,
EASY
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:
MEDIUM
The angular diameter of a planet measured from earth is If the diameter of the planet is then its distance from the earth is
MEDIUM
A bottle of ammonia and a bottle of dry hydrogen chloride connected through a long tube are opened simultaneously at both ends. The white ammonium-chloride ring first formed will be-
HARD
A hot air balloon with a payload rises in the air. Assume that the balloon is spherical in shape with diameter of and the mass of the ballon and the payload (without the hot air inside) is Temperature and pressure of outside air are and 1 atm , respectively. Molar mass of dry air is . The temperature of the hot air inside is close to [The gas constant, ]
EASY
The nearest star to our solar system is light years away. The distance of this star in Parsec is (Mean distance between the earth and the sun and one light year
MEDIUM
A compound is formed by two elements and . Atoms of element form hexagonal close packing (hcp) lattice and those of the elements occupy of tetrahedral voids. The formula of the compound formed by the elements and is
MEDIUM
What is the density of water vapour at boiling point of water?
MEDIUM
Urea is produced by metabolism of _____.
EASY
Convert into Celsius.
HARD
is not isoelectronic with
MEDIUM
Which of the following is not a pollutant?
MEDIUM
Which of the following statements are true?
I. On heating the kinetic energy of particles in solids does not change because they have a fixed position.
II. Sublimation is the change of gaseous state directly to solid state without going through liquid state and vice versa.
III. The movement of particles from an area of higher concentration to lower concentration is called diffusion.
IV. The rate of evaporation is not affected by increasing the temperature.
EASY
What is the unit of density?
EASY
The dimension of light year
HARD
of a long chain fatty acid was dissolved in of hexane. 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 . What is the height of the monolayer?
[Density of fatty acid
