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:

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry

6 4259

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.

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: AIEEE , Bank Exams , CAT , GATE
Job Role: Analyst , Bank Clerk , Bank PO

2 4257

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:

Report Error

View Answer Report Error Discuss

Filed Under: General Awareness

4 4256

Q:

Which of the following is the largest phyllum in the animal kingdom in respect of number of species

A) Annalida	B) Platyhelminthes
C) Chordata	D) Arthropoda

Answer & Explanation Answer: D) Arthropoda

Explanation:

Report Error

View Answer Report Error Discuss

Filed Under: Biology

43 4255

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, $C H C l_{3}$ 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.

Report Error

View Answer Report Error Discuss

Filed Under: Chemistry
Exam Prep: AIEEE

9 4255

Q:

Explain hospitality in terms of hotel industry ?

Answer

Hospitality actually means, taking care of guests in the best possible way.

Organizing, providing services and looking care after guests is included in it.

It means friendly and generous treatment of guests.

Hospitality industry includes all companies involved in providing services for guests. They provide more mental satisfaction than tangible objects.

Workspace

Report Error

View answer Workspace Report Error Discuss

Subject: Hospitality

12 4254

Q:

Can ROM be used as stack?

Answer

ROM cannot be used as stack because it is not possible to write to ROM.

Workspace

Report Error

View answer Workspace Report Error Discuss

Subject: Hardware

6 4254

Q:

China's TCL Communication has a joint venture agreement with European company for manufacturing mobile handsets?

A) Alcatel	B) Nokia
C) Siemens	D) None of these

Questions

Quick Links