Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: The colloidal surfaces of humus are negatively charged.
Reason R: The negative charges arise from exposed functional groups like hydroxyl, carboxylic or phenolic.
In the light of the above statements, choose the most appropriate answer from the options given below:
Both the assertion and reason are correct.
Three runners A, B and C run a race, with runner A finishing 12 meters ahead of runner B and 18 meters ahead of runner C, in another race of same type r...
Before servicing, a car runs at a speed of 26 km/hr while after servicing, it runs at a speed of 52 km/h. After servicing the car covers a certain dista...
In a 250-metre race, ‘A’ beats ‘B’ by 16 seconds or 80 metres. Find the time taken by ‘B’ to finish the race.
‘A’ and ‘B’ started moving towards each other at same time with a speed of 12 km/hr and 16 km/hr, respectively. If the distance covered by ‘B ...
Train ‘A’ running with a speed of 54 km/hr. can cross a standing goods train of 4 times its length in 20 seconds. Find the time taken by 240 meters ...
A train moving at 3/5th of its normal speed reaches its destination 10 hours late. Find the normal time taken by it.
A train running at the speed of 35 metre per second crosses a bridge in 30 seconds. Another which is 130 metre shorter than the previous train crosses t...
A driver of truck sees an ambulance 160 meters ahead of him. After 20 seconds the ambulance is 140 meters behind. If the speed of the truck is 80 kmp/h,...
Speed of a car and a bus is 20 km/h and 10 km/h, respectively. If the time taken by the car to cover a distance of ‘9x’ km is 4 hour less than time ...
The speed of two cars A and B are in the ratio of 12:15 respectively. Car A travels 15 km less than the car B in the same time duration. What was the di...
