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Q:

The oxidation number of Cr in K2Cr2O7 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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Filed Under: Chemistry
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Q:

Ankara is the capital of which country?

A) Uruguay B) Turkey
C) Uganda D) Vanuatu
 
Answer & Explanation Answer: B) Turkey

Explanation:
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Filed Under: Country Capitals

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Q:

Merdeka cup is associated with

A) Badminton B) Tennis
C) Football D) Hockey
 
Answer & Explanation Answer: C) Football

Explanation:

Merdeka cup is associated with Football in Indonesia.

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Filed Under: General Awareness
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Q:

The following SQL is which type of join: SELECT CUSTOMER_T. CUSTOMER_ID, ORDER_T. CUSTOMER_ID, NAME, ORDER_ID FROM CUSTOMER_T,ORDER_T ;

A) Equi-join B) Natural join
C) Outer join D) Cartesian join
 
Answer & Explanation Answer: D) Cartesian join

Explanation:
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Filed Under: Database

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Q:

When was the wealth tax first introduced in India ?

A) 1948 B) 1957
C) 1976 D) 1991
 
Answer & Explanation Answer: B) 1957

Explanation:
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Filed Under: Indian Politics

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Q:

Gold and silver are extracted from their respective ores by _______

A) Smelting B) Roasting
C) Leaching D) Hydro metallurgy
 
Answer & Explanation Answer: D) Hydro metallurgy

Explanation:
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Filed Under: Chemistry

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Q:

Which one of the following cities is called the 'zero mile centre ' of India

A) Kanpur B) Allahabad
C) New Delhi D) Nagpur
 
Answer & Explanation Answer: D) Nagpur

Explanation:
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Filed Under: Indian Geography

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Q:

64 S on CB?

Answer

The given statement implies that 64 Squares on Carrom Board.

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