Kushal travels in a train at a speed of 60 km/h for 5 hours, with bus he travels at 40 km/h speed for 3 hours
and walks at a speed of 5 km/h for 1 hour. What is the total distance he covered?
Answers
Answer:
105 km
Explanation:
60km + 40km + 5km = 105km
Answer:
Explanation:
a.
(i) Metals can produce hydrogen gas with hydrochloric acid only when the metal will be able to replace the hydrogen atom from the HCl. In order to replace the hydrogen atom from the HCl gas, the metals should be placed above the hydrogen atom in the reactivity series of metals.
(ii) If we leave a piece of iron in the open for some time, it acquires a coating of brownish substance. This substance is called as rust and the process of its formation is called rusting. This is the only change that effects iron articles and slowly destroy them.
Since iron is used in making bridges, ships, cars, truck and many other objects. Rusting weakens the structures of iron objects and cuts short their life.
(iii) Mercury is a metal which exists in liquid form at room temperature . It is a shiny liquid metal with a high coefficient of expansion. It also has a high boiling point which is suitable for measurement of higher temperatures. Therefore, mercury is the metal used in the bulb of the thermometer.