Question
What is the colour of
base?Solution
Phenolphthalein : • Chemical formula: C14 H20 O4 • It is a synthetic acid/base indicator. • It is colourless in acidic medium and turns to pink in basic medium. Methyl orange: • Chemical Formula: C14 H 14 N3 NaO3  S. • It is a synthetic indicator. • It turns orange-red in acidic medium and is yellow in basic medium.
- Sneha travels a route in 9 hours at a constant speed of 14 km/h. If she wants to reduce the time to 6 hours, what should be her new speed?
Find the distance traveled by a train moving at a speed of 90 km/h, which takes 20% less time than a truck that covers 630 km at a speed of 70 km/h.
A wheel has a diameter of 28 meters and rotates at a speed of 25 revolutions per minute. How much distance will the wheel travel in 32 minutes?
- Two cars ‘X’ and ‘Y’, which were 750 km apart, started traveling towards each other at the same time and met after 6 hours. If the speed of car ‘...
Arjun, cycling at a speed of 81 km/hr, can complete one round of a square field in 8 seconds. The radius of a circular field is 4 meters more than each ...
If a person walks 25% more than of his usual speed, reaches his distance 90 minutes before. If the destination is 495 km away, then the usual speed of a...
Identify the cases where two objects moving in opposite directions have a relative speed of 30 km/h.
- P' travelled from Delhi to Agra, covering a total distance of 396 km. For the initial three hours, he maintained an average speed of ‘a’ km/h. After th...
Time taken by a boat to travel certain distance in upstream direction is twice the time taken by the boat to cover same distance in downstream direction...
A runs 200 m in 24 s, B runs 200 m in 30 s. What start should A give B in a 200 m race so they finish together?
Relevant for Exams:
