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Q:

The oxidation number of Cr in $K_{2} {Cr}_{2} O_{7}$ is

A) +6	B) -5
C) +3	D) -4

Answer & Explanation Answer: A) +6

Explanation:

We will rewrite the formula as an equation.

2K + 2Cr + 7O = 0

The zero comes from there being no overall charge on the compound.

Each oxidation number is represented by the element's symbol.

Since this compound is not a peroxide or superoxide, the oxidation value for O is -2

K being in group 1 has a +1 charge and therefore has an oxidation number of K is +1

Now, by putting known values in we have:

2(+1) + 2(Cr) + 7(-2) = 0

2 + 2Cr -14 = 0

2Cr = +12

Cr = +6.

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Q:

Negative divided by Negative

A) -ve	B) +ve
C) 0	D) Can't be determined

Answer & Explanation Answer: B) +ve

Explanation:

We know the Mathematical rules that

$\frac{+}{+} = + \frac{+}{-} = - \frac{-}{+} = - \frac{-}{-} = +$

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Filed Under: Arithmetical Reasoning
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Q:

The first step in solving an Ethical Dilemma is to

A) identify the alternatives	B) identify an etical situation and ethical issues involved
C) weigh the impact of each alternative on various stakeholders.	D) recognize and analyze the principal elements in the situation.

Answer & Explanation Answer: B) identify an etical situation and ethical issues involved

Explanation:

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Q:

How many laws of physics are there?

A) 5	B) 4
C) 3	D) 2

Answer & Explanation Answer: C) 3

Explanation:

Physics has 5 laws. But the 3 laws of Newton has been clubbed together under one Law. Therefore there are 3 Newtons laws of Physics. They are ::

1. Newtons Laws of Motion

a. First Law of Motion

b. Second Law of Motion

C. Third Law of Motion

2. Newtons Law of Cooling

3. Newtons Law of Gravitation.

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Q:

A person of good understanding knowledge and Reasoning power

A) Snob	B) Expert
C) Literate	D) Intellectual

Answer & Explanation Answer: D) Intellectual

Explanation:

The one word substitute for A person of good understanding knowledge and Reasoning power is Intellectual.

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Filed Under: Alphabet Test
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Q:

What goes up when rain comes down?

A) Air	B) Heat
C) Umbrella	D) None

Answer & Explanation Answer: C) Umbrella

Explanation:

Yes, when rain starts falling umbrella goes up for pretecting us from wetting.

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Filed Under: Logic Puzzles
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Q:

Simplify the following expression?

40% of ( $\frac{24}{4} x ?$ ) = 48

A) 24	B) 22
C) 20	D) 18

Answer & Explanation Answer: C) 20

Explanation:

We know that

$40 % = \frac{40}{100} = \frac{2}{5} \Rightarrow \frac{2}{5} x \frac{24}{4} x ? = 48 ? = \frac{48 x 5 x 4}{2 x 24} = 20$

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Filed Under: Simplification
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Q:

What is the systematic name of ${NH}_{4} {ClO}_{3}$ ?

A) Ammonium Chloride	B) Ammonium Chlorate
C) Ammonium Chlorane	D) Ammonium Chlorine

Answer & Explanation Answer: B) Ammonium Chlorate

Explanation:

In common we all call the systematic name of $N H_{4} C l O_{3}$ as Ammonium Chlorate. But originally the systematic name is azanium trioxidochlorate.

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Filed Under: Chemistry
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