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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:

The atoms of the elements having same mass number but different atomic number are called

A) Isotopes B) Isobars
C) Isotones D) Isomers
 
Answer & Explanation Answer: B) Isobars

Explanation:
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Q:

The first space rocket to hit the moon was 

A) Apollo II B) Luna 9
C) Lunik 2 D) Zond 5
 
Answer & Explanation Answer: A) Apollo II

Explanation:
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Filed Under: General Awareness

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Q:

The Buddhist  Doctrines were written in 

A) Sanskrit B) Pali
C) Tibetan D) Not written in any language but orally transnitted
 
Answer & Explanation Answer: B) Pali

Explanation:
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Filed Under: Indian History

3 4271
Q:

Which alphabet is a vegetable?

A) C B) T
C) P D) B
 
Answer & Explanation Answer: C) P

Explanation:

The letter 'P' sounds same as the vegetable 'PEA'.

 

Hence P is an alphabet which is a vegetable.

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Q:

Hollywood movie named The Black Prince recently won the Special Jury Remi Award at the 50th annual Worldfest-Houston International Film Festival. Which Indian actress has acted in this movie  ?

A) Shabana Azmi B) Deepika Padukone
C) Juhi Chawla D) Priyanka Chopra
 
Answer & Explanation Answer: A) Shabana Azmi

Explanation:
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Q:

The headquarters of World Intellectual Property Organisation (WIPO) is located in

A) Paris B) Madrid
C) New York D) Geneva
 
Answer & Explanation Answer: D) Geneva

Explanation:
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Q:

Chloroform used as anaesthetic should be preserved in the dark in tightly stoppered bottles because otherwise

A) it becomes coloured B) it gets evaporated in air
C) it gets oxidised to phosgene D) it gets decomposed to chloropicrin
 
Answer & Explanation Answer: C) it gets oxidised to phosgene

Explanation:

Chloroform, CHCl3 is easily oxidised to the highly poisonous gas known as phosgene or carbonyl chloride COCl2. Hence if it is used as anaesthetic it should be kept free from sunlight and air.

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