# User Forum

Subject :NSO    Class : Class 9

Class : Class 8

## Ans 2:

Class : Class 9
Option B is wrong . As it is talking of the energy shell. OR might be the question is incorrect as the all the options are correct as per my information.

## Ans 3:

Class : Class 9
ans should no doubt be c because of the Hund 's rule and also fifth shell does accommodate 50 electrons according to 2n^2 :2*5^2=2*25=50.

## Ans 4:

Class : Class 9
(a) is no doubt right, (b) may be wrong, (c) is right and (d) is also right.

## Ans 5:

Class : Class 9
(D) is correct

Subject :NSO    Class : Class 9

## Ans 1:

Class : Class 9
Volume of the solid cube =(25*25*25)/1000000 cubic metre. Mass of the solid cube = the mass of the body which can be placed on it to completely submerge it Density = 0.1kg/ 125*(10)^6=800kg/m^3

## Ans 2:

Class : Class 9
Volume of the solid cube =(25*25*25)/1000000 cubic metre. Mass of the solid cube = the mass of the body which can be placed on it to completely submerge it Density = 0.1kg/ 125*(10)^6=800kg/m^3

Subject :NSO    Class : Class 9

Subject :NSO    Class : Class 9

Subject :NSO    Class : Class 9

Subject :NSO    Class : Class 4

Class : Class 4
b ans

## Ans 2:

Class : Class 4

Subject :NSO    Class : Class 9

Subject :NSO    Class : Class 9

Subject :NSO    Class : Class 9

Subject :NSO    Class : Class 7