0
Q:

# Alum is used

 A) as an analgesic B) in the purification of water C) as a fertilizer D) as a disinfectant

Answer:   B) in the purification of water

Explanation:

Alum is a common alum, potassium aluminum sulphate ${K}_{2}S{O}_{4}.{\left(A{l}_{2}S{O}_{4}\right)}_{3}.24{H}_{2}O$ which makes colloidally suspended impurities in water such as clay to settle down.

Subject: Chemistry
Exam Prep: AIEEE
Q:

Which solution has the highest pH?

 A) 50.0 mL 0.0500 M calcium hydroxide, Ca(OH)2 (aq) B) 50.0 mL 0.0500 M sodium hydroxide, NaOH (aq) C) 50.0 mL 0.0500 M nitric acid, HNO3 (aq) D) 50.0 mL 0.0500 M nitrous acid, HNO2 (aq)

Answer & Explanation Answer: A) 50.0 mL 0.0500 M calcium hydroxide, Ca(OH)2 (aq)

Explanation:

50.0 mL 0.0500 M calcium hydroxide, Ca(OH)2 (aq) has the highest pH value.

Sodium hydroxide and Calcium hydroxide are strong bases so they completely ionize in solution. Because they ionize at the same rate, and Calcium hydroxide has the higher pH calculated, then Calcium hydroxide, in fact, has the highest pH.

Nitric acid is a strong acid, so it completely ionizes in water. Whilst nitrous acid is a weak acid. Therefore, the nitric acid solution has the LOWEST ph.

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0 7
Q:

What state of matter is Jello?

 A) Liquid B) Solid C) Colloid D) Gas

Explanation:

Jello is a colloid, a semi-rigid structure i.e, semi-solid suspended in a liquid. When you Heat it up a bit and you'll break the protein bonds of the gelatin and it will liquefy completely and if you freeze, it becomes solid.

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0 67
Q:

Which of the following is malleable?

 A) Ice B) Gold C) Stone D) Pottery

Explanation:

Here in the given options, Gold is a malleable substance.

Malleable substance means a metal or a material able to be hammered or pressed into shape without breaking or cracking. i.e, tensile.

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0 40
Q:

Permanent Hardness of water can be removed by adding

 A) Bleaching powder B) Chlorine C) Wasshing soda D) Potassium permanganate

Explanation:

Hardness can be removed by adding sodium carbonate (washing soda) or by passing the water through an ion-exchange column.

Hardness in water is caused by dissolved magnesium ions and calcium ions. These can get into the water when it comes into contact with limestone and other rocks that contain calcium compounds. This can happen, for example, when rainwater flows over these rocks on its way to a reservoir.

Hardness in water is of two types. They are :

1. Temporary hardness

2. Permanent hardness

1. Temporary hardness:: Temporary hardness is caused by dissolved calcium hydrogen carbonate.

2. Permanent hardness:: Permanent hardness is caused by dissolved calcium sulfate. Unlike temporary hardness, it is not removed by boiling the water.

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1 34
Q:

What is a Solution and what are the two parts of a solution?

A solution is a homogeneous type of mixture of two or more substances.

A solution has two parts::

1. A solute and

2. A solvent.

The solute is the substance that dissolves, and the solvent is the majority of the solution.

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80
Q:

Which of the following atoms has the largest radius?

 A) Br B) K C) Na D) Cl

Explanation:

For neutral atoms, the periodic trends in atomic size can be described like this

Atomic size decreases when going from left to right across a period,
Atomic size increases when going from top to bottom down a group.

Let's use these trends to try and figure out which atom would have the largest radius.

If you look at elements that are located in the same group, potassium will have a larger atomic radius when compared with sodium. Likewise, bromine will have a larger atomic radius when compared with chlorine.

Now focus on potassium and bromine. Since potassium is located at the start of period 3, and bromine at the end of the same period, potassium will have a larger atomic radius than bromine, and thus the largest atomic radius of the four given atoms.

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1 64
Q:

Which of the following is a false statement?

 A) As bond order increases the strength of the bond increases B) Bond order is proportional to the bond length C) Molecules with negative bond order are highly unstable D) Bond order is inversely proportional to the bond length

Answer & Explanation Answer: B) Bond order is proportional to the bond length

Explanation:

Bond order is proportional to the bond length is a False statement since Bond order is inversely proportional to the bond length.

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2 56
Q:

Which of the following is an example of chemical weathering?

 A) Oxidation B) Acid rains C) Carbonation D) All the above

Explanation:

Chemical weathering is what happens when rocks are broken down and chemically altered.

Chemical weathering is the breakdown of rocks by chemical reactions. Chemical weathering involves changes in the chemical composition of the existing rock to form new rock. Some examples of chemical weathering are hydrolysis, oxidation, carbonation, dissolution, etc.