Chemistry | ECE Electronics and Communication Engineering | TANCET Anna University Online Objective Test

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry Equilibrium Prepare / Learn

Q1.

The ionization constant of acetic acid is

1 . 74 x 1 0^{- 5}

. Calculate the degree of dissociation of acetic acid in its 0.05 M solution. Calculate the concentration of acetate ion in the solution and its pH.

A. 0.00013M and pH 3.03

B. 0.00093M and pH 3.03

C. 0.00193M and pH 3.03

D. 0.00203M and pH 3.03

Answer : Option B
Explaination / Solution:

Ka =

C α^{2}

and pH=-log(Cα).

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry Hydrocarbons Prepare / Learn

Q2.

In the following sequence of reactions, the alkene is converted to compound $B$

$C H_{3} CH = CHC H_{3} \overset{O_{3}}{\to} A \overset{H_{2} O, Z n}{\to} B$

The compound $B$ is --------- ?

A. CH3 CHO

B. CH3CH2COCH3

C. CH3COCH3

D. CH3CH2CHO

Answer : Option A
Explaination / Solution:

The given sequence of conversion steps represent Ozonolysis of 2-Butene , which follows the following path ,

1 . Formation of an unstable intermediate / ozonide $(A)$

2 . Cleavage of the intermediate / ozonide by $(Z n + H_{2} O)$ to smaller molecules , giving out the compound $B$ , which is CH3 CHO ( Ethanal )

The reaction is well depicted as below ,

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry General Principles and Processes of Isolation of Elements Prepare / Learn

Q3. Which of the following ore contains both Mg and Ca?

A. Gypsum

B. Dolomite

C. Epsomite

D. Talc

Answer : Option B
Explaination / Solution:

Dolomite is

M g C O_{3}

C a C O_{3}

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry The p-Block Elements Prepare / Learn

Q4. A metal X on heating in nitrogen gas gives Y. Y on treatment with water gives a colourless gas which when passed through copper sulphate solution gives a blue colour. Y is

N H_{3}

M g_{3} N_{2}

M g (N O_{3}) 2

Answer : Option B
Explaination / Solution:

M g_{3} N_{2}

reacts with water to evolve NH_3. Which reacts with copper ion to form blue color complex.

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry Polymers Prepare / Learn

Q5. What is the nature of glucose – glucose linkage in starch that makes its so susceptible to acid hydrolysis

A. Starch is acetal

B. Starch is hemiacetal

C. Starch is polymer,

D. Starch contains only few molecules of glucose

Answer : Option A
Explaination / Solution:

Glucose glucose linkage in starch is acetal linkage.

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry Solid State Prepare / Learn

Q6. Fe3O4is

A. Diamagnetic

B. Ferromagnetic

C. Paramagnetic

D. none of these

Answer : Option B
Explaination / Solution:

F e_{3} O_{4} i s

is Ferromagnetic.

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry Redox Reactions Prepare / Learn

Q7. Which of the following elements does not show disproportionation tendency?

A. Br

B. Cl

C. F

D. I

Answer : Option C
Explaination / Solution:

F (Fluorine) is most electronegative element so it always show -1 oxidation state.

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry Classification of Elements and Periodicity in Properties Prepare / Learn

Q8. An ionic compound is expected to have tetrahedral structure if

\frac{r_{+}}{r_{-}}

lies in the range of

A. 0.225 to 0.414

B. 0.155 to 0.225

C. 0.732 to 1

D. 0.414 to 0.732

Answer : Option A
Explaination / Solution:

For tetrahedral

\frac{r_{+}}{r_{-}}

lies in the range 0.225 to 0.414.

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry Environmental Chemistry Prepare / Learn

Q9. The ozone layer found high in the stratosphere:

A. Is toxic to plants

B. Protects against the suns harmful UV rays

C. Is capable of disintegrating fabric and rubber

D. Can react with atmospheric pollutants to form smog

Answer : Option B
Explaination / Solution:

The ozone layer found high in the stratosphere Protects against the suns harmful UV rays

TANCET Anna University ECE Electronics and Communication Engineering # Chemistry Structure of Atom Prepare / Learn

Q10.

How many protons, neutrons and electrons are in $^{56} F e^{3 +}$ ?

A. 26 protons, 30 neutrons, 23 electrons

B. 26 protons, 30 neutrons, 26 electrons

C. 23 protons, 33 neutrons, 20 electrons

D. 23 protons, 33 neutrons, 26 electrons

Answer : Option A
Explaination / Solution:

Atomic number of iron (Fe) = 26

So number of protons = 26

Number of protons = number of electrons

But To gain 3+ charge it should loose 3 electron. So number of electrons present = 26-3 = 23

Now atomic mass = 56 (Given).

Number of neutrons = atomic mass - number of protons = 56-26 = 30

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