NEET 2018

The correct difference between first and
second order reactions is that

When initial concentration of the reactant is
doubled, the half-life period of a zero order
reaction

The type of isomerism shown by the complex
[CoCl2(en)2] is

The geometry and magnetic behaviour of the
complex [Ni(CO)4] are

Iron carbonyl, Fe(CO)5
is

Which one of the following ions exhibits d-d
transition and paramagnetism as well?

Match the metal ions given in Column I with
the spin magnetic moments of the ions given
in Column II and assign the correct code :

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Consider the change in oxidation state of
bromine corresponding to different emf values
as shown in the given diagram :

Then the species undergoing disproportionation
is :

Which oxide of nitrogen is not a common
pollutant introduced into the atmosphere both
due to natural and human activity?

The correction factor ‘a’ to the ideal gas
equation corresponds to

Given van der Waals’ constant for NH3
, H2,
O2
and CO2
are respectively 4.17, 0.244, 1.36
and 3.59, which one of the following gases is
most easily liquefied?

The compound C7H8
undergoes the following
reactions :

The product ‘C’ is

Hydrocarbon (A) reacts with bromine by
substitution to form an alkyl bromide which by
Wurtz reaction is converted to gaseous
hydrocarbon containing less than four carbon
atoms. (A) is

The solubility of BaSO4
in water is
2.42 × 10–3 g L–1 at 298 K. The value of its
solubility product (Ksp) will be (Given molar
mass of BaSO4
= 233 g mol–1)

Following solutions were prepared by mixing
different volumes of NaOH and HCl of different
concentrations :
A. 60 mL \({M \over {10}}\) HCl + 40 mL \({M \over {10}}\) NaOH
B. 55 mL \({M \over {10}}\) HCl + 45 mL \({M \over {10}}\) NaOH
C. 7...

Nitration of aniline in strong acidic medium
also gives m-nitroaniline because

Which of the following statements is not true
for halogens?

Which one of the following elements is unable
to form MF63– ion?

The correct order of atomic radii in group 13
elements is

Which of the following oxides is most acidic in
nature?

Regarding cross-linked or network polymers,
which of the following statements is incorrect?

Considering Ellingham diagram, which of the
following metals can be used to reduce
alumina?

For the redox reaction,
MnO4–
+ C2O4
2– + H+ \(\to\) Mn2+ + CO2
+ H2O
The correct coefficients of the reactants for
the balanced equation are

The correct order of N-compounds in its
decreasing order of oxidation states is

Magnesium reacts with an element (X) to form
an ionic compound. If the ground state
electronic configuration of (X) is 1s22s22p3,
the simplest formula for this compound is

Among CaH2
, BeH2
, BaH2
, the order of ionic
character is

Iron exhibits bcc structure at room temperature.
Above 900°C, it transforms to fcc structure. The
ratio of density of iron at room temperature to
that at 900°C (assuming molar mass and atomic
radii of iron remains constant with temperature)...

In which case is number of molecules of water
maximum?

A mixture of 2.3 g formic acid and 4.5 g oxalic
acid is treated with conc. H2SO4
. The evolved
gaseous mixture is passed through KOH
pellets. Weight (in g) of the remaining product
at STP will be

Which of the following molecules represents
the order of hybridisation sp2
, sp2
, sp, sp from
left to right atoms?

Which of the following carbocations is
expected to be most stable?

Which of the following is correct with respect
to – I effect of the substituents? (R = alkyl)

Which one is a wrong statement?

On which of the following properties does the
coagulating power of an ion depend?

The bond dissociation energies of X2
, Y2
and
XY are in the ratio of 1 : 0.5 : 1. \(\Delta\)H for the
formation of XY is –200 kJ mol–1. The bond
dissociation energy of X2
will be

The magnetic potential energy stored in a
certain inductor is 25 mJ, when the current
in the inductor is 60 mA. This inductor is of
inductance

An inductor 20 mH, a capacitor 100 \(\mu\)F and
a resistor 50 \(\Omega\) are connected in series across
a source of emf, V = 10 sin 314 t. The power
loss in the circuit is

The ratio of kinetic energy to the total energy
of an electron in a Bohr orbit of the hydrogen
atom, is

For a radioactive material, half-life is 10
minutes. If initially there are 600 number of
nuclei, the time taken (in minutes) for the
disintegration of 450 nuclei is

The electrostatic force between the metal plates
of an isolated parallel plate capacitor C having
a charge Q and area A, is

A moving block having mass m, collides with
another stationary block having mass 4m. The
lighter block comes to rest after collision. When
the initial velocity of the lighter block is v, then
the value of coefficient of restitution (e) will...

A set of n equal resistors, of value R each, are
connected in series to a battery of emf E and
internal resistance R. The current drawn is I. Now,
the n resistors are connected in parallel to the
same battery. Then the current drawn from ba...

A battery consists of a variable number n of
identical cells (having internal resistance r each)
which are connected in series. The terminals
of the battery are short-circuited and the current
I is measured. Which of the graphs shows the
co...

A carbon resistor of (47 \(\pm\) 4.7) k\(\Omega\) is to be marked
with rings of different colours for its identification.
The colour code sequence will be

When the light of frequency 2\({\upsilon _0}\)
(where \({\upsilon _0}\)
is
threshold frequency), is incident on a metal
plate, the maximum velocity of electrons
emitted is v1
. When the frequency of the
incident radiation is increased to ...

An electron of mass m with an initial velocity
\(\overrightarrow v = {v_0}\widehat i\) (v0 > 0)
enters an electric field
\(\overrightarrow E = - {\overrightarrow E _0}\widehat i\)
(E0
= constant > 0) at t = 0. If \(\lambda\)0
is its ...

An EM wave is propagating in a medium with
a velocity \(\overrightarrow v = v\widehat i\). The instantaneous
oscillating electric field of this em wave is
along +y axis. Then the direction of oscillating
magnetic field of the em wave will ...

A toy car with charge q moves on a frictionless
horizontal plane surface under the influence of
a uniform electric field \(\overrightarrow E\)
. Due to the force q\(\overrightarrow E\)
,
its velocity increases from 0 to 6 m s–1 in one
sec...

An electron falls from rest through a vertical
distance h in a uniform and vertically upward
directed electric field E. The direction of electric
field is now reversed, keeping its magnitude the
same. A proton is allowed to fall from rest i...

The refractive index of the material of a prism
is \(\sqrt 2\) and the angle of the prism is 30°. One
of the two refracting surfaces of the prism is
made a mirror inwards, by silver coating. A
beam of monochromatic light entering the
prism...