RRB GROUP D Chemistry Quiz - 66

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Question 1:

First ionization enthalpy of aluminium is lower than that of magnesium. Which of the following reason is correct?

Question 2:

The wavelength of an electron moving with a velocity of 2.05 × 107 m s-1 is

Question 3:

Relation between vapour density and molecular weight

Question 4:

The rate of diffusion Ethane is twice that of A. The molecular mass of A is-

Question 5:

Gases neither have definite shape nor definite volume . To liquefy the gases , conditions required are 

Question 6:

Ratio of radius of 2nd  orbit and 4th  orbit for hydrogen atom is

Question 7:

Of the three metals X , Y and Z , X reacts with cold water , Y with hot water and Z with steam. Identify X , Y and Z?

Question 8:

Which of the following is the closed system ?

Question 9:

During the transition of electrons from higher energy levels to lower energy levels. Energy is-

serach-testwale
x