Questions

Q:

Which one of the following statements is correct?

A) The oxidation number for hydrogen is always zero. B) The oxidation number for hydrogen is always + 1.
C) The oxidation number for hydrogen is always -1. D) Hydrogen can have more than one oxidation number.
 
Answer & Explanation Answer: D) Hydrogen can have more than one oxidation number.

Explanation:

Hydrogen has two possible oxidation numbers: +1 and -1.

-1 in case of hydrides.

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Q:

What is the other name of sodium carbonate?

A) Baking soda B) Washing soda
C) Baking powder D) No option is correct
 
Answer & Explanation Answer: B) Washing soda

Explanation:
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Q:

Matter is classified as a

A) pure substance B) mixture
C) both 1 & 2 D) none of the above
 
Answer & Explanation Answer: C) both 1 & 2

Explanation:
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Q:

Two or more elements combine to form a

A) atom B) valency
C) compound D) radical
 
Answer & Explanation Answer: C) compound

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Q:

In the Modern Periodic Table, elements are arranged in

A) increasing atomic mass number B) increasing atomic number
C) decreasing atomic mass number D) decreasing atomic number
 
Answer & Explanation Answer: B) increasing atomic number

Explanation:
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Q:

The credit for classifying the elements on the basis of their atomic masses goes to

A) John Dalton B) John Alexander Reina Newlands
C) Dmitri Mendeleev D) Johann Wolfgang Dobereiner
 
Answer & Explanation Answer: C) Dmitri Mendeleev

Explanation:
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Q:

The color of human skin depends upon

A) melanin B) carotenoids
C) anthocyanins D) chlorophylls
 
Answer & Explanation Answer: A) melanin

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Q:

In the following passage some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.


The preacher challenged hundreds of thousands of young people who gathered in a ___________ Polish meadow to reject being a "____________" who retreats into video games and computer screens and instead engage in social activism and politics to create a more just world. __________ his speech with ______________, the 79- year-old pope, despite a long day of public appearances, addressed his eager audience with enthusiasm yesterday on a warm summer night. Pope Francis spoke of a ______________ that comes from merely seeking convenience, from confusing happiness with a complacent way of life that could end up depriving people of the ability to determine their own fates.


Pope Francis spoke of a ______________ that comes from merely seeking convenience

A) selfishness B) panic
C) paralysis D) calamity
 
Answer & Explanation Answer: C) paralysis

Explanation:
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