Metals And Non Metals

To solve the problem, we need to understand the nature of the chemical used in antacids.

1. Understanding Antacids:
Antacids are substances used to neutralize excess stomach acid. They are usually basic in nature and help to raise the pH level of the stomach to relieve acidity and heartburn.

2. Common Chemicals in Antacids:
Antacids contain basic (alkaline) substances like sodium bicarbonate (NaHCO₃), calcium carbonate (CaCO₃), or magnesium hydroxide (Mg(OH)₂), which react with hydrochloric acid (HCl) in the stomach to form water and neutral salts.

3. Evaluating the Options:
- Option (A): Basic – Correct, as antacids are basic substances.
- Option (B): Acidic – Incorrect, as antacids are not acidic.
- Option (C): Neutral – Incorrect, as antacids do not have a neutral pH; they are basic.
- Option (D): All the above – Incorrect, as only basic chemicals are used in antacids.

Final Answer:
The correct answer is option (A): Basic.

To solve this problem, we need to understand the terminology used in metallurgy, specifically related to the extraction of metals from ores.

1. Definition of Gangue:
Gangue refers to the earthy or undesired impurities (like sand, mud, etc.) that are present along with the ore. These impurities are not useful and are removed during the process of ore concentration.

2. Understanding Other Options:
(1) Flux – A substance added during smelting to react with gangue and form slag.
(3) Slag – The product formed when gangue reacts with flux.
(4) Mineral – A naturally occurring substance from which metal may or may not be extracted profitably.

3. Conclusion:
The correct term for impurities present in ore is gangue.

Final Answer:
The correct option is (B) Gangue.

To solve the problem, we need to identify the substance used as a flux in the smelting of haematite (Fe₂O₃).

1. Understanding the Role of Flux:
A flux is a substance added during smelting to combine with impurities (gangue) to form a slag. This slag is easily removable.

2. Nature of Gangue in Haematite:
The main impurity present during the smelting of haematite is **silica (SiO₂)**, which is acidic in nature.

3. Required Flux:
To remove acidic impurities like SiO₂, we use a basic flux. The most commonly used basic flux is **calcium carbonate (CaCO₃)**, which decomposes on heating to form CaO. CaO then reacts with SiO₂ to form calcium silicate (CaSiO₃), which is the slag.

Reaction:

Final Answer:
The correct answer is option (C): CaCO₃.

To solve the problem, we need to identify which block of the periodic table Potassium (K) and Calcium (Ca) belong to.

1. Understanding the Periodic Table Blocks:
Elements are categorized into blocks based on the type of atomic orbital that is being filled:

• s-block: Groups 1 and 2 (alkali and alkaline earth metals)
• p-block: Groups 13 to 18
• d-block: Transition elements (Groups 3 to 12)
• f-block: Lanthanides and Actinides

2. Locating Potassium and Calcium:
- Potassium (K) has atomic number 19 and is in Group 1 → s-block
- Calcium (Ca) has atomic number 20 and is in Group 2 → s-block

Final Answer:
Potassium and Calcium belong to the s-block elements (Option A).

To solve this question, we need to identify which of the given options is an ore of iron.

1. Understanding the Ores:
- Bauxite: An ore of aluminum (Al).
- Haematite: A primary ore of iron (Fe₂O₃), rich in iron content.
- Carnallite: An ore of potassium and magnesium.
- Pyrolusite: An ore of manganese (MnO₂).

2. Identifying the Correct Answer:
Among the options, Haematite is the correct ore of iron.

Final Answer:
Option (B) Haematite is correct.

To solve the problem, we need to identify the most reactive metal from the given options based on the activity series.

1. Understanding the Activity Series:
The activity series is a list of metals ranked according to their reactivity. The higher a metal is on the activity series, the more reactive it is. Metals that are more reactive can displace less reactive metals from their compounds in single displacement reactions.

2. Reactivity of Metals:
- Potassium is very reactive and is placed high on the activity series.
- Iron is less reactive than potassium but more reactive than zinc.
- Zinc is more reactive than iron but less reactive than potassium.
- Platinum is one of the least reactive metals and is placed very low on the activity series.

3. Conclusion:
The most reactive metal in the activity series from the given options is Potassium.

Final Answer:
The correct answer is (A) Potassium.

To solve the problem, we need to identify the process used for the purification of crude metal.

1. Understanding the Processes:

- Roasting is the process of heating an ore in the presence of oxygen, typically used to convert ores into oxides before extraction, not primarily for purification.
- Poling is a process used in metallurgy to remove impurities from molten metals, particularly in the refining of copper.
- Calcination is the process of heating ores to high temperatures in the absence of air to remove volatile components, but it is not used for purifying metals.
- Froth flotation is a process used for the purification of ores, especially those with different densities, by separating the valuable mineral from the gangue (impurities).

Final Answer:
The process used for the purification of crude metal is Poling (Option B).

To solve the problem, we need to identify the non-metal element from the given options.

1. Identification of Metals and Non-metals:
- Pb (Lead) is a metal.
- Sn (Tin) is a metal.
- K (Potassium) is a metal.
- S (Sulfur) is a non-metal.

Final Answer:
The non-metal among the following is (Sulfur).

To solve the problem, we need to identify which of the given metals occurs in the native form (i.e., in its pure elemental state in nature).

1. Understanding Native Form of a Metal:
Native form refers to a metal that is found in its natural, uncombined form, often as nuggets or crystals, without reacting with other elements to form compounds.

2. Analyzing the Given Metals:

- Gold (Au): Gold is a metal that naturally occurs in its native form. It is often found in its pure metallic state in nature.
- Calcium (Ca): Calcium does not occur in its native form; it is highly reactive and usually found in compounds like limestone or gypsum.
- Magnesium (Mg): Magnesium does not occur in its native form; it is usually found in compounds like magnesium carbonate or magnesium sulfate.
- Sodium (Na): Sodium also does not occur in its native form; it is highly reactive and is typically found in compounds like sodium chloride (NaCl).

Final Answer:
The metal that occurs in its native form is (Gold).

To determine the nature of non-metal oxides, we need to understand their chemical properties and behavior.

1. Understanding Non-Metal Oxides:
Non-metal oxides are compounds formed by the combination of a non-metal element with oxygen. Examples include (carbon dioxide), (sulfur dioxide), (nitrogen dioxide), and (phosphorus pentoxide). These oxides generally exhibit acidic properties when dissolved in water.

2. Acidic Nature of Non-Metal Oxides:
When non-metal oxides dissolve in water, they often form acids. For example:
- (carbonic acid)
- (sulfurous acid)
- (sulfuric acid)
These reactions show that non-metal oxides react with water to produce acidic solutions.

3. Basic Nature of Metal Oxides:
In contrast, metal oxides (e.g., , ) typically exhibit basic properties. When dissolved in water, they form bases. For example:
- (sodium hydroxide)
- (calcium hydroxide)

4. Conclusion:
The nature of non-metal oxides is generally acidic because they form acids when dissolved in water.

Final Answer:

To determine which substance is not formed when a metal carbonate reacts with dilute acid, we need to analyze the chemical reaction involved.

1. Understanding the Reaction:
When a metal carbonate ( , where is a metal) reacts with a dilute acid (such as hydrochloric acid, ), the general reaction can be represented as:

To solve the problem, we need to identify the correct chemical formula for Plaster of Paris.

1. Understanding Plaster of Paris:
Plaster of Paris is a chemical compound that is obtained by heating gypsum (CaSO₄·2H₂O) to about 150°C. When heated, gypsum loses water molecules and becomes Calcium Sulfate Hemihydrate.

2. Chemical Formula of Plaster of Paris:
The formula for Plaster of Paris is:

This indicates that each unit contains half a molecule of water of crystallization.

Final Answer:
The chemical formula of Plaster of Paris is .