Chemistry Exam: Quiz Questions!

1. Cobalt-60 is used in quality control and treating cancer.

As it s a radioactive element

As it emits alpha rays

As it emits gamma radiation

As it produces ultrasonic waves

Cobalt-60 is used in quality control and treating cancer because it emits gamma radiation. Gamma radiation is a high-energy form of electromagnetic radiation that can penetrate through materials and kill cancer cells. It is also used in quality control processes because it can be easily detected and measured, allowing for accurate testing and analysis.

Explanation

Cobalt-60 is used in quality control and treating cancer because it emits gamma radiation. Gamma radiation is a high-energy form of electromagnetic radiation that can penetrate through materials and kill cancer cells. It is also used in quality control processes because it can be easily detected and measured, allowing for accurate testing and analysis.

2. What is the suitable alloy for the manufacture of Juice containers?

Iron-Aluminum

Aluminum-Copper

Manganese-Aluminum

Iron-Manganese

Manganese-Aluminum is the suitable alloy for the manufacture of juice containers because it provides good corrosion resistance and is lightweight. Manganese improves the strength and hardness of aluminum, making it more durable and suitable for holding liquids. Additionally, the combination of manganese and aluminum ensures that the alloy is resistant to acidic substances often found in juices, preventing any unwanted reactions or contamination.

Explanation

Manganese-Aluminum is the suitable alloy for the manufacture of juice containers because it provides good corrosion resistance and is lightweight. Manganese improves the strength and hardness of aluminum, making it more durable and suitable for holding liquids. Additionally, the combination of manganese and aluminum ensures that the alloy is resistant to acidic substances often found in juices, preventing any unwanted reactions or contamination.

3. Which of the following is used in the manufacture of cosmetics?

Zinc oxide , Titanium dioxide

Manganese dioxide , Titanium dioxide

Vanadium pentoxide , Manganese sulphate

Chromium trioxide , Zinc oxide

Zinc oxide and titanium dioxide are commonly used in the manufacture of cosmetics. Zinc oxide is used as a sunscreen agent and provides protection against both UVA and UVB rays. Titanium dioxide is also used as a sunscreen agent and helps to block harmful UV rays. Both of these ingredients are safe for use in cosmetics and are often found in sunscreens, foundations, and other skincare products.

Explanation

Zinc oxide and titanium dioxide are commonly used in the manufacture of cosmetics. Zinc oxide is used as a sunscreen agent and provides protection against both UVA and UVB rays. Titanium dioxide is also used as a sunscreen agent and helps to block harmful UV rays. Both of these ingredients are safe for use in cosmetics and are often found in sunscreens, foundations, and other skincare products.

4. Nickel-Chromium alloy is used in heating coils and electric furnaces because:

It resists corrosion even it is hot

It has high resistance to electric current

It produces high amount of heat

It consume a small amount of energy to produce heat

Nickel-Chromium alloy is used in heating coils and electric furnaces because it resists corrosion even when it is exposed to high temperatures. This is important in these applications as the coils and furnaces are subjected to extreme heat, which can cause other materials to corrode and degrade. By using a Nickel-Chromium alloy, the coils and furnaces can maintain their integrity and performance over time, making them more durable and reliable.

Explanation

Nickel-Chromium alloy is used in heating coils and electric furnaces because it resists corrosion even when it is exposed to high temperatures. This is important in these applications as the coils and furnaces are subjected to extreme heat, which can cause other materials to corrode and degrade. By using a Nickel-Chromium alloy, the coils and furnaces can maintain their integrity and performance over time, making them more durable and reliable.

5. Scandium is used in the manufacture of Git fighter due to:

It has low density and high hardness

It keeps its strength at elevated temperatures

It gives steel hardness and corrosion resistance

It resists the effect of atmosphere

Scandium is used in the manufacture of Git fighters because it has low density and high hardness. These properties make it ideal for creating lightweight yet strong materials, which are crucial in aerospace applications. The low density allows the fighter to be more fuel-efficient, while the high hardness ensures durability and resistance to wear and tear.

Explanation

Scandium is used in the manufacture of Git fighters because it has low density and high hardness. These properties make it ideal for creating lightweight yet strong materials, which are crucial in aerospace applications. The low density allows the fighter to be more fuel-efficient, while the high hardness ensures durability and resistance to wear and tear.

6. The element or the compound or the alloy used in obtaining pure drinkable water in deserts.

Copper

Copper (II) sulphate

Potassium permenganate

Cobalt 60

Copper (II) sulphate can be used to obtain pure drinkable water in deserts. Copper (II) sulphate is a compound that has antimicrobial properties, which means it can kill or inhibit the growth of microorganisms such as bacteria and algae. When added to water, it can help in disinfecting and purifying it, making it safe for drinking. This compound is commonly used in water treatment processes to remove impurities and ensure the water is safe for consumption.

Explanation

Copper (II) sulphate can be used to obtain pure drinkable water in deserts. Copper (II) sulphate is a compound that has antimicrobial properties, which means it can kill or inhibit the growth of microorganisms such as bacteria and algae. When added to water, it can help in disinfecting and purifying it, making it safe for drinking. This compound is commonly used in water treatment processes to remove impurities and ensure the water is safe for consumption.

7. Which of the following are used as an oxidizing agent?

KMnO4 / Cr2O3 / V2O5

MnO2 / MnSO4 / K2Cr2O7

CuSO4 / V2O5 / MnSO4

K2Cr2O7 / MnO2 / KMnO4

K2Cr2O7, MnO2, and KMnO4 are all commonly used as oxidizing agents. They have the ability to accept electrons from other substances, causing them to be oxidized. K2Cr2O7, also known as potassium dichromate, is a strong oxidizing agent that is commonly used in laboratory settings. MnO2, or manganese dioxide, is another powerful oxidizing agent that is often used in chemical reactions. KMnO4, or potassium permanganate, is a purple-colored compound that is widely used as an oxidizing agent in various applications, including water treatment and organic synthesis.

Explanation

K2Cr2O7, MnO2, and KMnO4 are all commonly used as oxidizing agents. They have the ability to accept electrons from other substances, causing them to be oxidized. K2Cr2O7, also known as potassium dichromate, is a strong oxidizing agent that is commonly used in laboratory settings. MnO2, or manganese dioxide, is another powerful oxidizing agent that is often used in chemical reactions. KMnO4, or potassium permanganate, is a purple-colored compound that is widely used as an oxidizing agent in various applications, including water treatment and organic synthesis.

8. Four elements A, B, C, and D: the element (A) used as a catalyst in the preparation of Ammonia gas in industry, one of the compounds of the element (B) used as an oxidizing agent in the dry cell, the element (C) used in the manufacture of heating coils and element (D) is the first discovered metal. Based on the previous information, the correct arrange of these four elements will be:

Fe-Ni-Cu-Mn

Mn-V-Fe-Zn

V-Zn-Mn-Fe

Fe-Mn-Ni-Cu

The correct arrangement of the four elements based on the given information is Fe-Mn-Ni-Cu. Element A is used as a catalyst in the preparation of Ammonia gas, which is iron (Fe). Element B is used as an oxidizing agent in dry cells, which is manganese (Mn). Element C is used in the manufacture of heating coils, which is nickel (Ni). Finally, element D is the first discovered metal, which is copper (Cu).

Explanation

The correct arrangement of the four elements based on the given information is Fe-Mn-Ni-Cu. Element A is used as a catalyst in the preparation of Ammonia gas, which is iron (Fe). Element B is used as an oxidizing agent in dry cells, which is manganese (Mn). Element C is used in the manufacture of heating coils, which is nickel (Ni). Finally, element D is the first discovered metal, which is copper (Cu).

9. Which of the following is used as a fungicide?

ZnS , MnSO4

CuSO4 , MnSO4

ZnS, CuSO4

CuSO4

None

Both CuSO4 (copper sulfate) and MnSO4 (manganese sulfate) are commonly used as fungicides. They are effective in controlling fungal diseases on plants by inhibiting the growth and reproduction of fungi. CuSO4 acts by disrupting the cell membrane of the fungi, while MnSO4 helps in activating enzymes that can suppress fungal growth. Therefore, the correct answer is CuSO4, MnSO4.

Explanation

Both CuSO4 (copper sulfate) and MnSO4 (manganese sulfate) are commonly used as fungicides. They are effective in controlling fungal diseases on plants by inhibiting the growth and reproduction of fungi. CuSO4 acts by disrupting the cell membrane of the fungi, while MnSO4 helps in activating enzymes that can suppress fungal growth. Therefore, the correct answer is CuSO4, MnSO4.

10. Which of the following compounds are used in the painting?

ZnO / K2Cr2O7 / MnO2

Cr2O3 / V2O5 / ZnO

CuSO4 / ZnO / Cr2O3

Option 4

K2Cr2O7 / KMnO4 / ZnO

The correct answer is Cr2O3 / V2O5 / ZnO. This is because Cr2O3 (chromium(III) oxide) and V2O5 (vanadium(V) oxide) are commonly used as pigments in paints, providing various colors such as green and yellow. ZnO (zinc oxide) is also used as a white pigment in paints. Therefore, these compounds are commonly used in the painting process.

Explanation

The correct answer is Cr2O3 / V2O5 / ZnO. This is because Cr2O3 (chromium(III) oxide) and V2O5 (vanadium(V) oxide) are commonly used as pigments in paints, providing various colors such as green and yellow. ZnO (zinc oxide) is also used as a white pigment in paints. Therefore, these compounds are commonly used in the painting process.