Correct Answer: B. K₂CO₃

Explanation

Let's analyze each compound:

A. NaHCO₃ (Sodium Bicarbonate): Sodium bicarbonate (baking soda) readily decomposes on heating to form sodium carbonate, water, and carbon dioxide.

2NaHCO₃(s) → Na₂CO₃(s) + H₂O(g) + CO₂(g)

So, NaHCO₃ decomposes.

B. K₂CO₃ (Potassium Carbonate): Potassium carbonate is a Group 1 alkali metal carbonate. Alkali metal carbonates are generally very stable to heat and do not decompose easily, except for lithium carbonate (Li₂CO₃), which decomposes due to the small size and high polarizing power of the Li⁺ ion. Potassium is a larger ion, and K₂CO₃ is highly stable to heat; it typically melts at high temperatures (around 891 °C) rather than decomposing under normal heating conditions.

So, K₂CO₃ does *not* decompose (or is extremely resistant to decomposition) on heating.

C. MgCO₃ (Magnesium Carbonate): Magnesium carbonate is a Group 2 alkaline earth metal carbonate. These carbonates decompose on heating to form the metal oxide and carbon dioxide.

MgCO₃(s) → MgO(s) + CO₂(g)

This decomposition occurs at relatively moderate temperatures (e.g., above 350 °C).

So, MgCO₃ decomposes.

D. ZnCO₃ (Zinc Carbonate): Zinc carbonate is a transition metal carbonate. Most transition metal carbonates decompose on heating to form the corresponding metal oxide and carbon dioxide.

ZnCO₃(s) → ZnO(s) + CO₂(g)

This decomposition also occurs at moderate temperatures (e.g., above 300 °C).

So, ZnCO₃ decomposes.

Based on the analysis, NaHCO₃, MgCO₃, and ZnCO₃ all decompose on heating. K₂CO₃ is an alkali metal carbonate (not lithium) and is known for its thermal stability, meaning it does not decompose easily on heating.

The final answer is B

Correct Answer: D. atmosphere

Correct Answer: B. 7.2 units

Correct Answer: C. 202

Explanation

\((20_{three})^2 - (11_{three})^2\)

= \((20_{3} - 11_{3})(20_{3} + 11_{3})\)

= \((2_{3})(101_{3})\)

= \(202_{3}\)

Correct Answer: D. telescope

Correct Answer: D. quantity of goods bought

Explanation

The delivery note specifies the quantity of goods being delivered to the buyer. It may include details such as the number of units, weight, volume, or any other relevant measurement unit for the specific goods.

Correct Answer: D. Uriah

Correct Answer: A) directives

Explanation

The correct option is A: directives. Directives are instructions or orders given by someone in authority. In this case, the Central Bank provides directives to commercial banks to guide them on how to set their lending policies.

The other options are not correct for this question. Option B, moral suasion, refers to the use of persuasion or moral influence to encourage certain behavior. Option C, advisory notes, are recommendations or suggestions given for consideration. Option D, consolidation, refers to the process of combining multiple things into a single, unified entity.

In summary, the recommendation made by the Central Bank to commercial banks regarding their lending policy is known as directives. The Central Bank provides instructions and guidance to the commercial banks on how they should lend money.

Correct Answer: C) Patents account

Correct Answer: D. presence of high mountains