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Q:

Which reaction occurs spontaneously?

A) Cl2(g) + 2NaF(aq)--> F2(g) + 2NaCl(aq) B) I2(s) + 2NaF(aq)--> F2(g) + 2NaI(aq)
C) Cl2(g) + 2NaBr(aq)-->Br2(l) + 2NaCl(aq) D) I2(s) + 2NaBr(aq)--> Br2(l) + 2NaI(aq)
 
Answer & Explanation Answer: C) Cl2(g) + 2NaBr(aq)-->Br2(l) + 2NaCl(aq)

Explanation:

In this chemical reaction chlorine change oxidation number from 0 to -1 (reduction) and bromine change oxidation number from -1 to 0 (oxidation).

Chlorine is stronger oxidation reagent than bromine.

In VIIA or group 17 (halogen elements) there are six elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At) and tennessin(Ts).

They have high electronegativity because they have seven valence electrons in their outermost energy level, so they can gain an electron to have the octet rule.  

Going down in the group, element are weaker oxidazing reagent and less reactive.

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Filed Under: Chemistry
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Q:

Who has been appointed as new Chairman of Indian Railway Board in August 2017 ?

A) Ashwani Lohani B) S. K. Bhagat
C) Akhil Agarwal D) A. K. Mittal
 
Answer & Explanation Answer: A) Ashwani Lohani

Explanation:

Ashwani Lohani is IRSME officer, appointed as new Chairman of the Indian Railway Board soon after A.K. Mittal stepped down from the post. He is former Chairman & Managing Director of Air India.

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Filed Under: General Awareness
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3 5219
Q:

A fixture is defined as a device which

A) is used to check the accuracy of workpiece B) holds and locates a workpiece and guides and controls one or more cutting tools
C) holds and locates a workpiece during an inspection or for a manufacturing operation D) All of the above
 
Answer & Explanation Answer: B) holds and locates a workpiece and guides and controls one or more cutting tools

Explanation:

A_fixture_is_defined_as_a_device_which1551357222.jpg image

A fixture is defined as a device which holds and locates a workpiece and guides and controls one or more cutting tools.

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Filed Under: Physics
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1 5216
Q:

The first thermionic valve was invented by

A) Thomas Edison B) Richardson
C) J.A. Fleming D) Lee De Forest
 
Answer & Explanation Answer: C) J.A. Fleming

Explanation:
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Filed Under: Inventions

1 5213
Q:

Which of the following novels was translated in to telugu as Pausanedi written by Paulo coelho ? 

A) Brida B) Thevalkyrie
C) The Daniel and Miss prym D) The Alchemist
 
Answer & Explanation Answer: D) The Alchemist

Explanation:
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Filed Under: Books and Authors

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Q:

Which one of the following is present in the largest amount in terms of percent by mass in the earth's crust

A) Silicon B) Oxygen
C) Carbon D) Calcium
 
Answer & Explanation Answer: B) Oxygen

Explanation:
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Filed Under: World Geography

1 5210
Q:

The schools which taught primary education to Muslims during the period of sultanate

A) Mukhaddams B) Makthabs
C) Kohies D) None
 
Answer & Explanation Answer: B) Makthabs

Explanation:

Makthabs taught the primary education to muslims during the period of sultanate

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Filed Under: World History

6 5207
Q:

Nickname of Jayaprakash Narayan?

A) Lok Pal B) Lok Nayak
C) Lokansh D) Lok Satta
 
Answer & Explanation Answer: B) Lok Nayak

Explanation:

nickname_of_jayaprakash_narayan1561466732.jpg image

 

Jayaprakash Narayan was an Indian independence activist, theorist, socialist and political leader who is popularly known as Lok Nayak.

 

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Filed Under: Famous Personalities
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