Chemistry - Online Test

TANCET Anna University CSE, IT Computer Science Engineering and Information Technology Chemistry TEST : 2

TANCET Anna University CSE, IT Computer Science Engineering and Information Technology # Chemistry Coordination Compounds Prepare / Learn

Q1. Which among the following is an ambidentate ligand?

A. Carbonyl

B. Acetate

C. Oxalate

D. Nitro

Answer : Option D
Explaination / Solution:

O N O^{-}

and

N {O_{2}}^{-}

TANCET Anna University CSE, IT Computer Science Engineering and Information Technology # Chemistry Hydrogen Prepare / Learn

Q2. Hydrogen has the simplest atomic structure among all the elements around us in Nature. Its electronic configuration is

1 s^{2}

2 s^{1}

B. 2s1

C. 1s1

D. 1s12s1

Answer : Option C
Explaination / Solution:

As Hydrogen has 1 electron which fills in orbital of s subshell of First Shell.

TANCET Anna University CSE, IT Computer Science Engineering and Information Technology # Chemistry Chemistry in Everyday Life Prepare / Learn

Q3. The neurotransmitter that plays a role in mood swings is

A. Serotonin

B. Dopamine

C. Noradrenaline

D. Glycine

Answer : Option C
Explaination / Solution:

Noraderaline is neutrotransmitter which play role in mood swings.

TANCET Anna University CSE, IT Computer Science Engineering and Information Technology # Chemistry Electrochemistry Prepare / Learn

Q4. Electrochemistry is the study of production of electricity from

A. nuclear energy and the use of heat energy to bring about non-spontaneous chemical transformations

B. energy released during spontaneous chemical reactions and the use of electrical energy to bring about non-spontaneous chemical transformations

C. nuclear energy and the use of electrical energy to bring about non-spontaneous chemical transformations

D. energy released during spontaneous chemical reactions and the use of heat energy to bring about non-spontaneous chemical transformations

Answer : Option B
Explaination / Solution:

Electrochemistry is branch of chemistry that deals with production of electricity from a chemical reaction or carrying out a non spontaneous reaction using electricity.

TANCET Anna University CSE, IT Computer Science Engineering and Information Technology # Chemistry Chemical Bonding and Molecular Structure Prepare / Learn

Q5. Octet of electrons, represents a particularly stable electronic arrangement.. Atoms achieve the stable octet when they are linked by chemical bonds. This rule is associated with one of the following theories

A. Valence Bond (VB) Theory

B. Lewis approach

C. Valence Shell Electron Pair Repulsion VSEPR Theory

D. Molecular Orbital (MO) Theory

Answer : Option B
Explaination / Solution:

Lewis developed electronic theory of valence or theory of chemical bonding to explain the formation of chemical bond between the two atoms.

According to the electronic theory of valence, every atom tries to attain octet configuration (presence of eight electrons) in its valence shell by losing or gaining or by sharing of electrons. This is known as the "Octet Rule".

by Counterflix

The electrostatic forces of attraction that holds the two oppositely charged ions together are known as "electrovalent bond".

TANCET Anna University CSE, IT Computer Science Engineering and Information Technology # Chemistry Organic Chemistry Some Basic Principles and Techniques Prepare / Learn

Q6. Change in hybridisation affects the carbon’s and the organic compound’s

A. bond enthalpy

B. bond strength

C. bond length

D. electronegativity

Answer : Option D
Explaination / Solution:

in hybridization as % of 's'character increases electronegativity also increases.

more the s charater, more will be the electronegativity of that atom.

increasing order ofelectronegativity with %s character is sp (50%) > sp2(33.33%) > sp3(25%)

TANCET Anna University CSE, IT Computer Science Engineering and Information Technology # Chemistry Redox Reactions Prepare / Learn

Q7. The term oxidation was coined for the class of chemical reactions wherein one of the following options take place.

A. addition of oxygen to a substance

B. addition of hydrogen to a substance

C. removal of electronegative element from a substance

D. addition of electropositive element to a substance

Answer : Option A
Explaination / Solution:

Oxidation means addition of oxygen, removal of hydrogen, increase in oxidation number, addition of a electronegative element or removal of an electropositive element

The term oxidation was first used to describe chemical reactions in which oxygen was added to an element of a compound. Later on the term oxidation was extended to describe many more reactions which occurred without the use of even oxygen.

Addition of Oxygen: Oxidation is a chemical reaction in which oxygen is added to any chemical species (atom, ion or molecule). Example

2Mg + O2 → 2MgO

S + O2 → SO2

2CO + O2 → 2CO2

Na2SO3 + H2O2 → Na2SO4 + H2O

Removal of Hydrogen : Oxidation is a chemical reaction in which hydrogen is removed from any chemical species (atom, ion or molecule).

H2S + Cl2 → 2HCl + S

4HI + O2 → 2H2O + 2I2

4HI + MnO2 → MnCl2 + 2H2O + Cl2

Addition of an Electronegative Element: Oxidation is a chemical reaction in which an electronegative element is added into any chemical species (atom, ion or molecule).

Fe+ S → FeS (Oxidation of iron)

SnCl2 + Cl2→ SnCl4(Oxidation of stannous chloride)

2Fe + 3F2 → 2FeF3(Oxidation of iron)

Removal of an Electropositive Element: Oxidation is a chemical reaction in which an electropositive element is removed from any chemical species (atom, ion or molecule).

2KI + H2O2 → 2KOH + I2 (Oxidation of potassium iodide)

2K2MnO4 + Cl2 → 2KCl + 2KMnO4 (Oxidation of potassium manganate)

2KI + Cl2 → 2KCl + I2 (Oxidation of potassium iodide)

A substance which brings oxidation is known as oxidizing agentt

TANCET Anna University CSE, IT Computer Science Engineering and Information Technology # Chemistry The s-Block Elements Prepare / Learn

Q8. The s-block elements of the Periodic Table have only

A. one group

B. three groups

C. two groups.

D. four groups

Answer : Option C
Explaination / Solution:

s block comprises of only two groups alkali metal group and alkaline earth metal groups

TANCET Anna University CSE, IT Computer Science Engineering and Information Technology # Chemistry Haloalkanes and Haloarenes Prepare / Learn

Q9. The IUPAC name for tertiary butyl iodide is

A. 1 – Iodo, 3 – methyl propane

B. 4 – Iodobutane

C. 2 – Iodobutane

D. 2 – Iodo 2-methyl propane

Answer : Option D
Explaination / Solution:

IUPAC name of

actually here firstly we select longest chain and it is of 3 carbon.and at number 2 position there is iodo as well as methyl ,so its name is 2-iodo 2-methyl propane.
is 2 – Iodo 2·methyl propane

TANCET Anna University CSE, IT Computer Science Engineering and Information Technology # Chemistry Biomolecules Prepare / Learn

Q10. Carbohydrates Which taste sweet are called

A. aldehydes and ketones

B. Sugars

C. Saccharides

D. Saccharides and sugars.

Answer : Option D
Explaination / Solution:

carbohydrates like monosaccharides (one sugar molecule, example: Glucose) and disaccharides (two sugar molecule,example Sucrose I.e Table sugar) always tastes sweet.

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TANCET Anna University CSE, IT Computer Science Engineering and Information Technology Chemistry TEST : 2