Chemistry
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New answer posted
a year agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
option (ii) surface tension
Surface tension minimises the surface area of the liquid and at minimum surface area, the liquid is in its the lowest energy state and hence most stable. Spherical shape of rain droplets has minimum surface area due to surface tension.
New question posted
a year agoNew answer posted
a year agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
Option (iii) pressure decreases
At high altitude the pressure is low and therefore, water boils at lower temperature because the vapour pressure becomes equal to atmospheric temperature at low temperature due to which the food takes more time to be cooked without using a pressure cooker.
New question posted
a year agoNew answer posted
a year agoContributor-Level 10
(a) The element V has the highest first ionization enthalpy (? iH1) and positive electron gain enthalpy (? egH) and hence it is the least reactive element. Since inert gases have positive? egH, therefore, the element-V must be an inert gas. The values of? iH1, ? iH2 and? egH match that of He.
(b) The element II which has the least first ionization enthalpy (? iH1) and a low negative electron gain enthalpy (? egH) is the most reactive metal. The values of ? iH1, ? iH2 and? egH match that of K (potassium).
(c) The element III which has high fi
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