NEET - Grade 11 - Chemistry - Some Basic Concepts of Chemistry - Study ref# 1835
The following data are obtained when dinitrogen and
dioxygen react together to from different compounds.
read moreNEET - Grade 11 - Biology - Biomolecules - Study ref# 4136What is zwitterion? Answer: An amino acid has both a basic amine group and an acidic carboxylic acid group. There is an internal transfer of a hydrogen ion from the -COOH group to the -NH2 group to leave an ion with both a negative charge and a posit... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9673Which of the
following conditions favors the existence of a substance in the solid state?
(A)High temperature
read more NEET - Grade 12 - Chemistry - The Solid State - Study ref# 9674Which of the
following is not a characteristic of a crystalline solid?
(A)Define and characteristic heat of
fusion
read more NEET - Grade 12 - Chemistry - The Solid State - Study ref# 9675Which of the
following arrangements shows schematic alignment of magnetic moments of
antiferromagnetic substances?
Answer: (d) The substances
which have domain structure are oppositely oriented and cancel each other... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9676Which of the
following is true about the value of refractive index of quartz glass?
(a)
Same in all
directions
(b)
Different in
different directions
(c)
Cannot be measured
(d)
Always zero Answer: (a)Since,... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9677Iodine molecules
are held in the crystals lattice by………
(a) London
forces
(b)
dipole-dipole interactions
(c) Covalent
bonds
(d) coulombic
forces Answer: (a)
Iodine molecules are
a class of non-pol... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9678Which of the
following is a network solid?
(a)
SO2(solid)
(b)
I2
(c)
Diamond
(d)
H2O(ice) Answer: (a)
Diamond is a giant molecule
is which constituent atoms are held together by covalent bond. Hence,... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9679Which of the
following is not the characteristic of ionic solids?
(a)
Very low value of
electrical conductivity in the molten state
(b)
Brittle nature
(c)
Very strong forces of
interactions
(d)
Anisotropic... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9680Which of the
following oxides behaves as conductor or insulator depending upon
temperature?
(a)
TiO
(b)
SiO2
(c)
TiO3
(d)
MgO Answer: Certain metal
oxides like VO2, VO, VO3 and TiO3 show
metallic or ins... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9681The lattice site
in a pure crystal cannot be occupied by…….
(a)
Molecule
(b)
Ion
(c)
Electron
(d)
atom Answer: (c)Each point in
a lattice is known as lattice point which are either atom or molecule ... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9682Graphite cannot
be classified as………..
(a)
Conducting solid
(b)
Network solid
(c)
Covalent solid
(d)
Ionic solid Answer: (d) Graphite
can’t be classified as ionic solid as graphite is not made u... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9683Schottky defect
is observed in crystals when………. .
(a)
Some cations move
from their lattice site to interstitial sites
(b)
Equal number of
cations and anions are missing from the lattice
(c)
Som... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9684In which pair
most efficient packing is present?
(a)
hcp and bcc
(b)
hcp and ccp
(c)
bcc and ccp
(d)
bcc and simple cubic
cell Answer: (b) Packing efficiency is the percentage of
total filled space by par... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9685The percentage
of empty space in a body centered cubic arrangement is ……..
(a)
74
(b)
68
(c)
32
(d)
26 Answer: (c)
Packing efficiency
for bcc arrangement is 68% which represents total fille... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9686Which kinds of
defects are introduced by doping?
(a)
Dislocation defect
(b)
Schottky defect
(c)
Frenkel defect
(d)
Electronic defect Answer: (d) When
electron rich or electron deficient impurity is added to a... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9687Silicon doped
with electron rich impurity forms…… .
(a)
p-type semiconductor
(b)
n-type semiconductor
(c)
intrinsic
semiconductor
(d)
insulator Answer: (b) Silicon
doped with electron rich impu... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9688Which of the
following is not true about the ionic solids?
(a)
Bigger ions from the
close packed structure
(b)
Smaller ions occupy
either the tetrahedral or the octahedral voids depending upon their size
(c)
Oc... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9689The number of
tetrahedral voids per unit cell in NaCl crystal is…….. .
(a)
4
(b)
8
(c)
Twice the number of
octahedral voids
(d)
Four times the number
of octahedral voids Answer: (b, c) NaCl as a... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9690Amorphous solids
can also be called……… .
(a)
Pseudo solids
(b)
True solids
(c)
Super cooled liquids
(d)
Super cooled solids Answer: (a ,c) Amorphous
solid has short range order which has a ten... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9691Why are liquids
and gases categorised as fluids? Answer: Liquids and
gases have the tendency to flow, i.e., their molecules can move freely from one
place to another. Therefore, they are known as fluids. E.g., glass panes
fixed to windows... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9692Why are solids
incompressible? Answer: The distance
between the constituent particles is very less in solids. On bringing them
still closer repulsion will start between electron clouds of their particles.
Hence, they cannot be brought fur... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9693Why does table
salt, NaCl sometimes appear yellow in color? Answer: Yellow color in
NaCl is due to metal excess defect due to which unpaired electrons occupy
anionic sites, known as F-centres. These electrons absorb energy from the
visibl... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9694Explain why does
conductivity of germanium crystals increase on doping with gallium? Answer: On doping
germanium with gallium some of the positions of lattice of germanium are
occupied be gallium. Gallium atom has only three valence electron... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9695Assertion (A)
Graphite is the good conductor electricity however diamond belongs to the
category of insulators.
Reason (R) Graphite
is soft in nature on the other hand diamond is very hard and brittle.
(a)
Assertion and reason... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9696Assertion (A)
the packing efficiency is maximum for the fcc structure.
Reason (R) the
coordination number is 12 in fcc structures.
(a)
Assertion and reason
both are correct statement and reason is correct explanation for asser... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9697With the help of
a labeled diagram show that there are four octahedral voids per unit cell in
a cubic close packed structure. Answer: Cubic close
packed structure contains one atom at each of eight corners of unit cell and
one atom at eac... read moreNEET - Grade 12 - Chemistry - The Solid State - Study ref# 9698How does the
doping increase the conductivity of semiconductors? Answer: (A)Conductivity
of a semiconductor is too low for particle use. The conductivity of a
semiconductor can be increased by adding a suitable amount of impurity to
perfe... read moreNEET - Grade 12 - Chemistry - Surface Chemistry - Study ref# 9791Match the statement given in Column I
with the phenomenon given in Column II.
... read moreNEET - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9797Zone refining is based on the principle
that
(a) Impurities of low boiling metals can
be separated by distillation.
(b) Impurities are more soluble in molten
metal than in solid metal.
(c) Different components of a mixture are
di... read moreNEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9825Which of the following statements are
correct?
(a) All the three N – O bond lengths in are equal.
(b) All P – Cl bond lengths in PCl5
molecule in gaseous state are equal.
(c) P4 molecule in white
phosphorus have regular strain there... read moreNEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9830Why is nitric oxide paramagnetic in
gaseous state but the solid obtained on cooling it is diamagnetic? Answer: In gaseous state, NO2 exists
as a monomer which has one unpaired electron but in solid state, it dimerises
to N2O4 so no unpaired ... read moreNEET - Grade 12 - Chemistry - The p-Block Elements - Study ref# 9839Match the items in Column I and Column II
and mark the correct option.
Column I... read moreNEET - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9868Match the statements given in Column I
with the oxidation states given in Column II.
... read moreNEET - Grade 12 - Chemistry - The d and f block Elements - Study ref# 9869Match the property given in Column I with
the element given in Column II.
Column I
... read moreNEET - Grade 12 - Chemistry - Haloalkanes and Haloarenes - Study ref# 9935Match the items of Column I and Column
II.
| read moreNEET - Grade 12 - Biology - Molecular Basis of Inheritance - Study ref# 10214State the difference between the
structural genes in a Transcription Unit of Prokaryotes and Eukaryotes. Answer:
read moreNEET - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10600Identify the electromagnetic waves whose
wavelength vary as:
(i)
(ii)
Write one use for each. Answer: (i) Identification
(ii)... read moreNEET - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10602Name the type of EM waves having a
wavelength range of 0.1m to 1mm. How are these waves generated? Write their
two uses. Answer: Name of EM wave
Method of generation
Two uses
Microwaves
Produced by special vacuum tubes
Klyston, m... read more
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