1
MCQ (Single Correct Answer)

JEE Main 2016 (Online) 9th April Morning Slot

Match the items in Column I with its main use listed in Column II :

Column I Column II
(A) Silica gel (i) Transistor
(B) Silicon (ii) Ion-exchanger
(C) Silicone (iii) Drying agent
(D) Silicate (iv) Sealant
A
(A)-(iii), (B)-(i), (C)-(iv), (D)-(ii)
B
(A)-(iv), (B)-(i), (C)-(ii), (D)-(iii)
C
(A)-(ii), (B)-(iv), (C)-(i), (D)-(iii)
D
(A)-(ii), (B)-(i), (C)-(iv), (D)-(iii)

Explanation

(A)   Silica gel (SiO2) is a good dehydrating agent. It is used good dehydrating agent. It is used to absorb moisture.

SiO2  +   2H2O  $$ \to $$  SiO2  .  2H2O

(B)    Silicon is used in transistor as it is a semiconductor.

(c)   Silicon is a good resistant of heat, water. So it used as sealant to seal some element.

(d)   Silicate including zeolites used in ion-exchange beds in domestic and commercial water purification, softening and other applications.
2
MCQ (Single Correct Answer)

JEE Main 2016 (Online) 10th April Morning Slot

Aqueous solution of which salt will not contain ions with the electronic configuration 1s22s22p63s23p6 ?
A
NaF
B
NaCl
C
KBr
D
CaI2

Explanation

NaF is composed of Na+ and F.

Na+ : 1s22s22p6

F- : 1s22s22p6

Hence do not match with the configuration given in the question.
3
MCQ (Single Correct Answer)

JEE Main 2016 (Online) 10th April Morning Slot

Assertion :     Among the carbon allotropes, diamond is an insulator, whereas, graphite is a good conductor of electricity.

Reason :     Hybridization of carbon in diamond and graphite are sp3 and sp2, respectively.
A
Both assertion and reason are correct, and the reason is the correct explanation for the assertion.
B
Both assertion and reason are correct, but the reason is not the correct explanation for the assertion
C
Assertion is incorrect statement, but the reason is correct.
D
Both assertion and reason are incorrect.

Explanation

In diamond, each C - atom is covalently bonded with four other carbon atom. So it utilizes its four unpaired electrons in bond formation. Due to this reason diamond is a bad conductor of electricity.

In graphite, each carbon atom is covalently bonded to three carbon atom. In those bond formation 3 out of 4 valence electrons of each C - atom are used while the fourth electron is free to move in the structure of graphite. Due to this reason graphite is a good conductor of electricity.

In diamond, each carbon is bonded with 4 other carbon so, carbon is sp3 hybridized.

In graphite, each carbon is bonded with 3 other carbon so carbon is sp2 hybridized.

So, here both Assertion and Reason are correct but hybridization is not the reason for the Assertion.
4
MCQ (Single Correct Answer)

JEE Main 2016 (Online) 10th April Morning Slot

Identify the incorrect statement :
A
S2 is paramagnetic like oxygen.
B
Rhombic and monoclinic sulphur have S8 molecules.
C
S8 ring has a crown shape.
D
The S-S-S bond angles in the S8 and S6 rings are the same.

Explanation



S8 ring has crown shape and bond angle is 107o

S6 ring has chair form hexagon ring and bond angle is 102.2o.

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