0
Q:

Wavelength of which of the following colours of the visible spectrum of light are maximally  absorbed by green plants________

A) Green and Yellow B) Red and Blue
C) Green and Red D) Blue and Yellow

Answer:   B) Red and Blue



Explanation:
Subject: Chemistry
Q:

What is the conjugate base of H2O?

A) NH3+ B) OH-
C) H2O D) All the above
 
Answer & Explanation Answer: B) OH-

Explanation:

A conjugate acid, is a species formed by the reception of a proton (H+) by a base—in other words, it is a base with a hydrogen ion added to it.

On the other hand, a conjugate base is what is left over after an acid has donated a proton during a chemical reaction. Hence, a conjugate base is a species formed by the removal of a proton from an acid.

Because some acids are capable of releasing multiple protons, the conjugate base of an acid may itself be acidic.

Represented as the following chemical reaction:

Acid + Base ⇌ Conjugate Base + Conjugate Acid

 

The water molecule is the conjugate acid of the hydroxide ion after the latter received the hydrogen proton donated by ammonium. On the other hand, ammonia is the conjugate base for the acid ammonium after ammonium has donated a hydrogen ion towards the production of the water molecule. We can also refer to OH- as a conjugate base of H2O, since the water molecule donates a proton towards the production of NH+4 in the reverse reaction, which is the predominating process in nature due to the strength of the base NH3 over the hydroxide ion.

 

Report Error

View Answer Workspace Report Error Discuss

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

0 13
Q:

What does the Aufbau Principle state

A) Electrons will be added to an atom starting from the lowest possible level or sublevel. B) Electrons will be added to an atom only if the orbitals are different colors.
C) Electrons will be added to an atom in a random order. D) Electrons will be added to an atom in a symmetrical manner.
 
Answer & Explanation Answer: A) Electrons will be added to an atom starting from the lowest possible level or sublevel.

Explanation:

The Aufbau Principle states that in the ground state of an atom, an electron enters the orbital with lowest energy first and subsequent electrons are fed in the order of increasing energies.

Report Error

View Answer Workspace Report Error Discuss

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

0 70
Q:

Which of the following is a micro nutrient?

A) Mg B) Cl
C) P D) Ca
 
Answer & Explanation Answer: B) Cl

Explanation:

The micronutrients (or trace minerals): boron (B), chlorine (Cl), manganese (Mn), iron (Fe), zinc (Zn), copper (Cu), molybdenum (Mo), nickel (Ni). and cobalt (Co).

Report Error

View Answer Workspace Report Error Discuss

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

0 40
Q:

What is a product in a chemical reaction?

Answer

In chemistry, a product is a substance that is formed as the result of a chemical reaction. In a reaction, starting materials called reactants and the ending materials are called products.

Report Error

View answer Workspace Report Error Discuss

Subject: Chemistry Exam Prep: AIEEE , Bank Exams
Job Role: Analyst , Bank Clerk , Bank PO

0 32
Q:

Chemical name of Gold?

A) Argentinum B) Ferrus
C) Aurum D) Selenium
 
Answer & Explanation Answer: C) Aurum

Explanation:

The Chemical name of Gold is Aurum with symbol Au with atomic number 79 and a group 11 element. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal.

Chemically, gold is a transition metal.

Report Error

View Answer Workspace Report Error Discuss

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

0 54
Q:

What is the oxidation number of sulfur in H2S?

A) 2 B) -2
C) 1 D) -1
 
Answer & Explanation Answer: B) -2

Explanation:

The sum of the oxidation numbers in a compound must equal zero. In the compound hydrogen sulfide, H2S, the two hydrogen atoms have an oxidation number of +1, for a total of +2.

Therefore, the oxidation number of sulfur in the compound is -2, and the sum of the oxidation numbers is 0.

Report Error

View Answer Workspace Report Error Discuss

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

0 29
Q:

Iron rusting, chemical or physical change

A) Chemical B) Physical
C) Both A & B D) None of the above
 
Answer & Explanation Answer: A) Chemical

Explanation:

In rusting the Iron ore make a chemical reaction with the oxygen in the presence of water and environmental or atmospheric moisture to produce an Iron oxide. Iron oxide is otherwise called as rust.


The rusting of iron is a chemical change because it is two substances reacting together to make a new substance.

Report Error

View Answer Workspace Report Error Discuss

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

0 28
Q:

When combining with nonmetallic atoms, metallic atoms generally will

A) Lose electrons and forms cations B) Gain electrons and forms anions
C) Lose electrons and forms anions D) Gain electrons and forms cations
 
Answer & Explanation Answer: A) Lose electrons and forms cations

Explanation:

When combining with nonmetallic atoms, metallic atoms generally will Lose electrons and forms cations.

 

As the ionization energy of te metals are very low, so they can easily lose electrons and form positively charged ion called cations.

Report Error

View Answer Workspace Report Error Discuss

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

0 62