Subject :NSO Class : Class 6
The given figure shows different arrangements of particles of an unknown substance undergoing changes I, II, III and IV.
Fill in the blanks by choosing an appropriate option.
The change(s) (p) involve(s) absorption of heat
while change(s) (q) involve(s) evolution of heat.
In all these changes, (r) of the substance remains
constant.
| (p) | (q) | (r) | |
| A | I, II | III, IV | Volume |
| B | III | I, II, IV | Mass |
| C | I, II, IV | III | Mass |
| D | I, II, IV | III | Energy |
c
Ans 1:
Class : Class 6
Correct answer is C . Because P involved absorbtion of heat 1 liquid to gas ,2solid to liquid ,4solid to gas .Q involved evolution of heat (heat is given)i.e exothermic.gas to liquid.R involved substance remains constant that is Mass .mass remains constant in every medium .i.eas the density of gas decrease so the mass also decrease but it will have same mass everywhere.