TOP MCQ प्रश्न , last time prepration

Prepration of Phenol

Which method is feasible for the prepration of compound (X) only ?

Write equations for the prepration of NaHCO_3 ?

Write equations for complete process of prepration of Na_2CO_3 :-

Acid Halides || Method OF Prepration || From Acid || From ester || From Acid Anhydride || Chemical Properties :- Reaction with Grignard Reagent || Hydrogenation Reaction || Esters || Method OF Prepration :- || From Esterification || From Acid Halide

In a 800 m race around a stadium having the circumference of 200 m, the top runner meets the last runner on the 5th minute of the race. If the top runner runs at twice the speed of the last runner, what is the time taken by the top runner to finish the race ?

A particle is dropped from the top of a tower. If it falls half of the height of the tower in its last second of journey, find the time of journey.

A body dropped from the top of a tower covers 7/16 of the total height in the last second of its fall. The time of fall is

A stone dropped form the top of a tower is found to travel (5//9) of the height of tower during last second of its fall. The time of fall is :