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Q:

By how many atomic mass units do subsequent members of homologous series differ?

A) 26 B) 32
C) 20 D) 14
 
Answer & Explanation Answer: D) 14

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Q:

When electricity is passed through an aqueous solution of Sodium Chloride (brine), it decomposes to form.

 

A) NaOH + H2 + Cl2 B) NaOH + H2 + O2
C) NaOH + HCl + H2 D) NaOH + H2 + N2
 
Answer & Explanation Answer: A) NaOH + H2 + Cl2

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Q:

Ice floats on water because its density is

A) more than water B) zero
C) less than water D) same as water
 
Answer & Explanation Answer: C) less than water

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Q:

Which of the following solutions is the most acidic among them all?

A) Solution with pH value 0 B) Solution with pH value 6
C) Solution with pH value 1 D) Solution with pH value 7
 
Answer & Explanation Answer: A) Solution with pH value 0

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Q:

What product is formed when electricity is passed through an aqueous solution of sodium chloride?

A) Sodium and Chlorine B) Sodium oxide
C) Sodium hydroxide D) Sodium and water
 
Answer & Explanation Answer: C) Sodium hydroxide

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Q:

If a solution turns blue litmus red, its pH is likely to be

A) 7 B) 8
C) 9 D) 6
 
Answer & Explanation Answer: D) 6

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Q:

What are transition elements?

A) Elements whose two outermost shells are incomplete B) Elements which possess properties of both, metals and non-metals
C) They have eight electrons in the outermost shell D) Elements whose three outermost shells are incomplete
 
Answer & Explanation Answer: A) Elements whose two outermost shells are incomplete

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Q:

Identify a use of the isotope of uranium.

A) Fuel in nuclear reactors B) Treatment of goitre
C) Treatment of cancer D) Fuel in aeroplanes
 
Answer & Explanation Answer: A) Fuel in nuclear reactors

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