Explanation

In SF6 (sulfur hexafluoride), the central sulfur atom is bonded to six fluorine atoms in an octahedral arrangement. This results in two types of bond angles:

• The F-S-F bond angles in the equatorial plane are 90°
• The F-S-F bond angles between the equatorial and axial fluorine atoms are 180°

Explanation

• First, we calculate the number of moles of acetic acid used:

Number of moles of acetic acid = mass of acetic acid / molar mass of acetic acid

Number of moles of acetic acid = 30 g / 60 g/mol = 0.5 moles

Since the reaction is 1:1 between acetic acid and ethyl acetate, the number of moles of ethyl acetate produced is also 0.5 moles.

• Now, we can calculate the theoretical yield of ethyl acetate:

Theoretical yield of ethyl acetate = number of moles of ethyl acetate * molar mass of ethyl acetate

Theoretical yield of ethyl acetate = 0.5 moles * 88 g/mol = 44 grams

• Now, we can calculate the percentage yield:

Percentage yield = (actual yield / theoretical yield) * 100%

Percentage yield = (40 g / 44 g) * 100%

Percentage yield ≈ 90.9%

So, the percentage yield of the ester is approximately 90.9%.

Explanation

Sulfur is used in insecticides to control pests and fungi.

It is also used in treating skin diseases like scabies and acne, and in making fireworks due to its flammability.

Explanation

Enthalpy of hydration:

This term refers to the energy change when one mole of gaseous ions dissolves in water to form an infinitely dilute solution, meaning the ions are completely surrounded by water molecules

Explanation

Alcohol and water form a miscible liquid mixture with different boiling points.

Fractional distillation effectively separates them based on their boiling point differences.

Explanation

The reaction 2KMnO₄ + Cl₂ → 2KMnO₄ + 2KCl is  Oxidation reduction reaction. 

In this reaction, the oxidation number of chlorine changes from 0 in Cl₂ to -1 in KCl, which is considered reduction.

While the oxidation state of manganese and potassium remains the same in KMnO₄,

The overall reaction involves a transfer of electrons between chlorine and potassium, making it a redox reaction. 

Explanation

 Pyramidal molecular structure is typically found in molecules like ammonia (NH₃), where there is a central atom with lone pairs and three bonded atoms.

Explanation

The correct order from least to most acidic:

• Ammonia (pH 11-12, strongly basic)
• Blood (pH 7.4, slightly basic)
• Milk (pH 6.5-7, slightly acidic)
• Orange juice (pH 3.5-4.5, strongly acidic)

Explanation

• The products in the reaction are Carbon dioxide (CO2) and Water (H2O).
• These products are formed through the combustion of Methane (CH4) and Oxygen (O2), releasing energy in the process.

Explanation

• The incorrect statement is: States of matter does not change during chemical reactions.
• During chemical reactions, states of matter can change.
• For example, a solid may dissolve in a liquid, a liquid may vaporize, or a gas may condense into a liquid.