Correct Answer: D. Portugal

Correct Answer: B. Dramatic irony

Correct Answer: A. sarcasm

Correct Answer: C. core

Correct Answer: A) Changes in the quantity purchased of a good is less than proportionate changes in its price

Explanation

This Economics question is asking about what it means for a commodity to be price inelastic. The term price inelastic refers to the responsiveness of the quantity purchased of a good to changes in its price. The options given are different ways to describe this responsiveness.

Option A states that a commodity is price inelastic if changes in the quantity purchased of a good is less than proportionate changes in its price. This means that if the price of a good increases, the quantity purchased of that good will decrease by a relatively small amount. Similarly, if the price of a good decreases, the quantity purchased of that good will increase by a relatively small amount. This is the correct answer.

Option B states that a commodity is price inelastic if changes in the quantity purchased of a good is proportional to change in its price. This is actually the definition of unitary price elasticity, which is different from price inelasticity.

Option C states that a commodity is price inelastic if changes in the quantity purchased of a good is more than proportionate changes in its price. This is actually the definition of price elasticity of demand, which is the opposite of price inelasticity.

Option D states that the quantity purchased of a good never responds to change in its price. This is not correct because all goods have some level of responsiveness to price changes, even if it is very small.

It is important to understand the concept of price elasticity of demand because it affects how producers and consumers respond to changes in price. Goods that are price inelastic, like essential goods or goods with no substitutes, tend to have more stable demand and can tolerate price increases without a significant decrease in quantity purchased. On the other hand, goods that are price elastic, like luxury goods or goods with many substitutes, tend to have more volatile demand and may see a significant decrease in quantity purchased if the price increases.

Correct Answer: D. Gamma rays

Correct Answer: A. overhead irrigation facilities

Correct Answer: D)

Zn(s) + 2HCl(aq) \(\rightarrow\) ZnCl\(_2\)(aq) + H\(_2\)(g)

Explanation

Hydrogen gas can be prepared in the laboratory through a variety of chemical reactions. The correct answer in this case isOption E, which represents the reaction between zinc (Zn) and hydrochloric acid (HCl):

\(Zn(s) + 2HCl(aq) \rightarrow ZnCl_2(aq) + H_2(g)\)

This reaction is an example of a single displacement reaction, where a more reactive metal (such as zinc) displaces a less reactive metal (hydrogen in this case) from its compound (HCl). As a result, hydrogen gas is produced and released, while the zinc forms a new compound with the chloride ions.

It's important to note that there are other methods to produce hydrogen gas in the laboratory, such as the reaction between a metal and water (Option B), but this example is not the most commonly used method due to the highly reactive nature of sodium metal. The other options do not form hydrogen gas as a product, making them incorrect for this specific question.

Correct Answer: B. a man's adventure on the sea

Correct Answer: C. Calcium carbonate