Structure of the Atom — Science STD 9 — Question

Bohr's atomic model can explain the spectrum of:

Which of the following is not a property of particles of matter:

Which of the following does not have a fixed melting point/ boiling point?

1. Gold.
2. Ethanol.
3. Air.
4. Oxygen.

Law of definite proportion does not apply to nitrogen oxide because:

Which of the following represents the correct electron distribution in magnesium ion?

Which one of the following statements related to the process of evaporation is incorrect?

Which of the following is true about FeS?

Find out the incorrect increasing/decreasing order in the following:

The evaporation of water increases under the following conditions:

1. Increase in temperature, decrease in surface area.
2. Increase in surface area, decrease in temperature.
3. Increase in surface area, rise in temperature.
4. Increase in temperature, increase in surface area, addition of common salt.

For each of the following, use letters to indicate physical state of matter. ‘s’ for solid, ‘l’ for liquid ‘g’ for gaseous, 'p' for plasma, B.E.C. for Bose-Einstein Condensate.

S.No.	Specific Characteristic	Physical state
1.	Ionised gases
2.	Most ordered state
3.	Least ordered state
4.	Fixed volume, no shape
5.	Cooling gas at super low temperature