Chemistry Test

Question 1
4 / -1

The electronic configuration of an element is $1 \mathrm{s}^{2}, 2 \mathrm{s}^{2}, 2 \mathrm{p}^{6}, 3 \mathrm{s}^{2}, 3 \mathrm{p}^{3} .$ Which is the atomic number of the element which is just below the above element in the periodic table?

A
34

B
49

C
33

D
31

Question 2
4 / -1

A copper strip having $3 \mathrm{~cm}$ length and $4 \mathrm{~cm}$ breadth is coated with silver of $2 \mathrm{~mm}$ thickness. Calculate the quantity of electricity (in coulomb) required for the above process. (Density of $\mathrm{Ag}=10.5 \mathrm{~g} \mathrm{~cm}^{-3}$ )

A
22516.67

B
22516.674

C
22516.677

D
22516.679

Question 3
4 / -1

The species present in solution when $\mathrm{C} \mathrm{O}_{2}$ is dissolved in water are:

A
$\mathrm{CO}_{2}, \mathrm{H}_{2} \mathrm{CO}_{3}, \mathrm{HCO}_{3}^{-}, \mathrm{CO}_{3}^{2-}$

B
$\mathrm{H}_{2} \mathrm{CO}_{3}, \mathrm{CO}_{3}^{2-}$

C
$\mathrm{CO}_{3}^{2-}, \mathrm{HCO}_{3}$

D
$\mathrm{CO}_{2}, \mathrm{H}_{2} \mathrm{CO}_{3}$

Question 4
4 / -1

In acidic medium, $\mathrm {H_{2} O_{2}}$ changes $\mathrm {C r_{2} O_{7}^{2-}}$ to $\mathrm {C r O_{5}}$ which has two (-O-O-) bonds. Oxidation state of $\mathrm{Cr}$ in $\mathrm{Cr} O_{5}$ is:

A
6

B
64

C
67

D
69

Question 5
4 / -1

The dipole moment of $H B r$ is $2.6 \times 10^{-30} C-m$ and the interatomic spacing is $1.41 \mathring A$. The percentage of ionic character in $H B r$ is:

A
11.5

B
11.54

C
11.57

D
11.59

Question 6
4 / -1

Acetamide is treated with the following reagents separately. Which one of these would yield methylamine?

A
$\mathrm{NaOH}-\mathrm {B r_{2}}$

B
Soda-lime

C
Hot conc. $\mathrm{H_{2} S O_{4}}$

D
$\mathrm{P C l_{5}}$

Question 7
4 / -1

A compound $X$ on heating gives a colourless gas. The residue is dissolved in water to obtain Y. Excess carbon dioxide is bubbled through an aqueous solution of $\mathrm{Y} ; \mathrm{Z}$ is formed. $Z$ on gently heating gives back $X$. The compound $X$ is:

A
$\mathrm{CaCO}_{3}$

B
$\mathrm{Ca}(\mathrm{OH})_{2}$

C
$\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}$

D
None of these

Question 8
4 / -1

Identify the incorrect statement regarding heavy water:

A
It is used as a coolant in nuclear reactors

B
It reacts with to produce $C D_{4}$ and $A l(O D)_{3}$

C
It reacts with $C a C_{2}$ to produce $C_{2} D_{2}$ and $C a(O D)_{2}$

D
It reacts with $S O_{3}$ to form deuterated sulphuric acid $\left(D_{2} S O_{4}\right)$

Question 9
4 / -1

The compound insoluble in acetic acid is:

A
Calcium oxide

B
Calcium carbonate

C
Calcium oxalate

D
Calcium hydroxide

Question 10
4 / -1

First and second ionization energies of Magnesium are $7.646$ and $15.035 \mathrm{eV}$ respectively. The amount of energy in $\mathrm{kJ}$ needed to convert all the atoms of Magnesium into $\mathrm{Mg}^{2+}$ ions present in $12\ \mathrm{mg}$ of Magnesium vapours is:
(Given $1\ \mathrm{eV}=96.5 \mathrm{~kJ} / \mathrm{mol}$)

A
1.1

B
1.14

C
1.17

D
1.19

Question 11
4 / -1

$6.2 \mathrm{~g}$ of a sample containing $\mathrm{Na}_{2} \mathrm{CO}_{3}, \mathrm{NaHCO}_{3}$ and non-volatile inert impurity on gentle heating loses $5 \%$ of its weight due to reaction $2 \mathrm{NaHCO}_{3} \longrightarrow \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2}$. Residue is dissolved in water and formed $100 \mathrm{~mL}$ solution and its 10 mL portion requires $7.5 \mathrm{~mL}$ of $0.2\ \mathrm{M}$ aqueous solution of $\mathrm{BaCl}_{2}$ for complete precipitation of carbonates. Determine weight (in gram) of $\mathrm{Na}_{2} \mathrm{CO}_{3}$ in the original sample.

A
1.06

B
1.064

C
1.067

D
1.069

Question 12
4 / -1

Which of the following has the lowest heat of hydrogenation per mole?

A
$1 -$ Butene

B
trans −2−Butene

C
cis−2− Butene

D
1, 3− Butadiene

Question 13
4 / -1

Two elements $\mathrm{A}$ and $\mathrm{B}$ form compounds having formula $\mathrm{AB}_{2}$ and $\mathrm{AB}_{4} .$ When dissolved in $20 \mathrm{~g}$ of benzene $\left(\mathrm{C}_{6} \mathrm{H}_{6}\right), 1 \mathrm{~g}$ of $\mathrm{AB}_{2}$ lowers the freezing point by $2.3 K$ whereas $1.0 \mathrm{~g}$ of $\mathrm{AB}_{4}$ lowers it by $1.3 \mathrm{~K}$. The molar depression constant for benzene is $5.1 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$. Calculate atomic masses of $\mathrm{A}$ and $\mathrm{B}$.

A
$25.59 \mathrm{~g} / \mathrm{mol}$ and $42.64 \mathrm{~g} / \mathrm{mol}$

B
$20.59 \mathrm{~g} / \mathrm{mol}$ and $39.64 \mathrm{~g} / \mathrm{mol}$

C
$26.49 \mathrm{~g} / \mathrm{mol}$ and $43.60 \mathrm{~g} / \mathrm{mol}$

D
$27.60 \mathrm{~g} / \mathrm{mol}$ and $48.68 \mathrm{~g} / \mathrm{mol}$

Question 14
4 / -1

Benzene can be conveniently converted into $\mathrm{n}-$ propyl benzene by:

A
Friedel-craft alkylation with n-propyl chloride.

B
Friedel-Craft acylation with propionyl chloride followed by Wolff-Kishner reduction.

C
Friedel-Craft acylation with propionyl chloride followed by catalytic hydrogenation.

D
Friedel-Craft acylation with propionyl chloride followed by reduction with $L i A l H_{4}$.

Question 15
4 / -1

Carbon tetrachloride has zero dipole moment because of ________.

A
Its planar structure.

B
Its regular tetrahedral structure.

C
Similar sizes of carbon and chlorine atoms.

D
Similar electron affinities of carbon and chlorine.

Submit Test

Chemistry Test ...

Question 1

34

49

33

31

Question 2

22516.67

22516.674

22516.677

22516.679

Question 3

\(\mathrm{CO}_{2}, \mathrm{H}_{2} \mathrm{CO}_{3}, \mathrm{HCO}_{3}^{-}, \mathrm{CO}_{3}^{2-}\)

\(\mathrm{H}_{2} \mathrm{CO}_{3}, \mathrm{CO}_{3}^{2-}\)

\(\mathrm{CO}_{3}^{2-}, \mathrm{HCO}_{3}\)

\(\mathrm{CO}_{2}, \mathrm{H}_{2} \mathrm{CO}_{3}\)

Question 4

6

64

67

69

Question 5

11.5

11.54

11.57

11.59

Question 6

\(\mathrm{NaOH}-\mathrm {B r_{2}}\)

Soda-lime

Hot conc. \(\mathrm{H_{2} S O_{4}}\)

\(\mathrm{P C l_{5}}\)

Question 7

\(\mathrm{CaCO}_{3}\)

\(\mathrm{Ca}(\mathrm{OH})_{2}\)

\(\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}\)

None of these

Question 8

It is used as a coolant in nuclear reactors

It reacts with to produce \(C D_{4}\) and \(A l(O D)_{3}\)

It reacts with \(C a C_{2}\) to produce \(C_{2} D_{2}\) and \(C a(O D)_{2}\)

It reacts with \(S O_{3}\) to form deuterated sulphuric acid \(\left(D_{2} S O_{4}\right)\)

Question 9

Calcium oxide

Calcium carbonate

Calcium oxalate

Calcium hydroxide

Question 10

1.1

1.14

1.17

1.19

Question 11

1.06

1.064

1.067

1.069

Question 12

1−Butene

trans −2−Butene

cis−2− Butene

1, 3− Butadiene

Question 13

\(25.59 \mathrm{~g} / \mathrm{mol}\) and \(42.64 \mathrm{~g} / \mathrm{mol}\)

\(20.59 \mathrm{~g} / \mathrm{mol}\) and \(39.64 \mathrm{~g} / \mathrm{mol}\)

\(26.49 \mathrm{~g} / \mathrm{mol}\) and \(43.60 \mathrm{~g} / \mathrm{mol}\)

\(27.60 \mathrm{~g} / \mathrm{mol}\) and \(48.68 \mathrm{~g} / \mathrm{mol}\)

Question 14

Friedel-craft alkylation with n-propyl chloride.

Friedel-Craft acylation with propionyl chloride followed by Wolff-Kishner reduction.

Friedel-Craft acylation with propionyl chloride followed by catalytic hydrogenation.

Friedel-Craft acylation with propionyl chloride followed by reduction with \(L i A l H_{4}\).

Question 15

Its planar structure.

Its regular tetrahedral structure.

Similar sizes of carbon and chlorine atoms.

Similar electron affinities of carbon and chlorine.

User

Question Analysis

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.

$1 -$ Butene