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# 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# 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# 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# 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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