QUESTIONS 2. Why should curd and sour substances not be kept in brass and copper vessels? Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas? Metal compound A reacts with dilute hydrochloric acid to produce Solution Verified by Toppr Was this answer helpful? 0

Which gas is usually liberated when and acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

The evolution of the primates from about 70 Ma [21,22] provides the ultimate background for encounters with fires in landscapes.Their development is largely owed to the ‘angiosperm revolution’ [10,11,23], in which flowering and fruiting trees provided niches for tree-living insectivores and especially frugivores as well as folivores.

Solution For How is the tertiary sector different from other sectors? Illustrate with a few examples.

We use averages for comparisons across different classes. Limitations of Using Averages : Averages calculate only the mean availability but they hide the disparities in the process. This is the main limitation of using averages.

For example, to compute the per-employee salary of an organization, averages have to be used because there are differences in the salaries of several employees. There are limitations to the use of averages: Even though they are helpful for comparison, they may also hide disparities.

Illustrate with your own examples related to development. We use averages as it is useful for comparing differing quantities of the same category. For example, in order to compute the per capita income of a country, averages are used because there are differences in the incomes of the people.