AIIMS 2018

Assertion (A) IUPAC name of the compound

Reason (R) In IUPAC nomenclature, ether is regarded as hydrocarbon derivative in which a hydrogen atom is replaced by-OR or- \(\mathrm{O} A r\) group [where, \(R=\) alkyl group and $$A r=\operatorna...

Assertion (A) \(\mathrm{CH}_3 \mathrm{OH}\) and \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}\) can be distinguished by haloform test.
Reason (R) Haloform test is given by \(2^{\circ}\) alcohol.

The relative reactivities of acyl compounds
towards nucleophilic substitution are in the
order of

Which of the following compounds do not
undergo aldol condensation?

Hydrolysis of sucrose with dilute aqueous
sulphuric acid yields

X and Y respectively are

The structure of \(\mathrm{IF}_7,\) is

Assertion (A) Among the two \(\mathrm{O}-\mathrm{H}\) bonds in \(\mathrm{H}_2 \mathrm{O}\) molecule, the energy required to break the first \(\mathrm{O}-\mathrm{H}\) bond and the other \(\mathrm{O}-\mathrm{H}\) bond is same.
Reason (R) This...

At equilibrium, the concentration of
$$\begin{gathered} \mathrm{N}_2=3.0 \times 10^{-3} \mathrm{M} \\ \mathrm{O}_2=4.2 \times 10^{-3} \mathrm{M} \\ \text{and} \quad \mathrm{NO}=2.8 \times 10^{-3} \mathrm{M} \end{gathered}$$
in a sealed vess...

Assertion (A) \(K_p\) can be equal to or less than or even greater than the value of \(K_C\).
Reason (R) \(K_p=K_C(R T)^{\Delta n}\)
Relation between \(K_p\) and \(K_C\) depends on the change in the number of moles of gaseous reactants and ...

Among the following statements, the correct statement about the half-life period for a first order reaction is

The rate constant for the first order
decomposition of a certain reaction is
described by the equation \(\ln k\left(\mathrm{~s}^{-1}\right)=14.34-\frac{1.25 \times 10^4 \mathrm{~K}}{T}\). The energy of activation for this reaction is

Assertion (A) The reaction
$$\begin{aligned} 2 \mathrm{NO}+\mathrm{O}_2 & \longrightarrow 2 \mathrm{NO}_2 \\ \text { and } \quad 2 \mathrm{CO}+\mathrm{O}_2 & \longrightarrow 2 \mathrm{CO}_2 \end{aligned}$$
proceeds at the same rate because ...

Food preservatives prevent spoilage of food due to microbial growth. The most commonly used preservatives are

The electronic configuration of central metal atom/ion in \(\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}\) is

The spin only magnetic moment of \([\mathrm{MnBr}_4]^{2-}\) is \(5.9 \mathrm{~BM}\). The geometry of this complex ion is

Which of the following compound has same
oxidation state of the central metal atom in
the cationic and anionic part?

The IUPAC name of the complex \([\mathrm{Pt}\left(\mathrm{NH}_3\right)_3 \mathrm{Br}\left(\mathrm{NO}_2\right) \mathrm{Cl}] \mathrm{Cl}\) is

Among the following complex ions, the one
which shows geometrical isomerism will be

Assertion (A) Toxic metal ions are removed
by the chelating ligands.
Reason (R) Chelate complexes tend to be
more stable.

The correct order of spin only magnetic moment (in BM) for \(\mathrm{Mn}^{2+}, \mathrm{Cr}^{2+}\) and \(\mathrm{Ti}^{2+}\) ions is

Assertion (A) Separation of Zr and Hf is
difficult.
Reason (R) Zr and Hf lie in the same group
of the periodic table.

For a \(\mathrm{Ag}-\mathrm{Zn}\) button cell, net reaction is
$$\begin{gathered}
\mathrm{Zn}(s)+\mathrm{Ag}_2 \mathrm{O}(s) \longrightarrow \mathrm{ZnO}(s)+2 \mathrm{Ag}(s) \\
\Delta G_f^{\circ}\left(\mathrm{Ag}_2 \mathrm{O}\right)=-11.21 ...

At \(25^{\circ} \mathrm{C}\), the molar conductance at infinite dilution for the strong electrolytes \(\mathrm{NaOH}, \mathrm{NaCl}\) and \(\mathrm{BaCl}_2\) are \(248 \times 10^{-4}, 126 \times 10^{-4}\) and $$280 \times 10^{-4} \mathrm{~S...

Assertion (A) For a Daniell cell \(\mathrm{Zn} / \mathrm{Zn}^{2+} \| \mathrm{Cu}^{2+} \mid \mathrm{Cu}\) with \(E_{\text {cell }}=1.1 \mathrm{~V}\), the application of opposite potential greater than \(1.1 \mathrm{~V}\) results into the flo...

Assertion (A) : The pH of acid rain is less
than 5.6.
Reason (R) : Carbon dioxide present in the
atmosphere dissolves in rain water and
becomes carbonic acid.

Which of the following represents
Wurtz-Fittig reaction?

A bromoalkane '\(X\)' reacts with magnesium in dry ether to form compound '\(Y\)'. The reaction of '\(Y\)' with methanol followed by hydrolysis yield an alcohol having molecular formula, \(\mathrm{C}_4 \mathrm{H}_{10} \mathrm{O}\). The comp...

Assertion (A) The boiling points of alkyl halides decrease in the order \(R \mathrm{I}>R \mathrm{Br}>\mathrm{RCl}>\mathrm{RF}\).
Reason (R) The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the...

Among the following rules, the one which is
applied in the given reaction is
\(\mathrm{CH}_3 \mathrm{CHBrCH}_2 \mathrm{CH}_3 \xrightarrow{\text { Alc. } \mathrm{KOH}}\)
I. \(\mathrm{CH}_3 \mathrm{CH}=\mathrm{CHCH}_3\) (major product)
II. $$...

Assertion (A) \(\mathrm{CH}_4\) does not react with \(\mathrm{Cl}_2\) in dark.
Reason (R) Chlorination of \(\mathrm{CH}_4\) takes place in sunlight.

The solubility product of sparingly soluble salt \(A X_2\) is \(3.2 \times 10^{-11}\). Its solubility (in mol/L) is

A gas ‘X’ is used in filling balloons for
meteorological observations. It is also used
in gas-cooled nuclear reactors. Here, the gas
X is

Assertion (A) : Nitration of benzene with
nitric acid requires the use of concentrated
sulphuric acid.
Reason (R) : The mixture of concentrated
sulphuric acid and concentrated nitric acid
produces the electrophile, NO\(_2^+\).

Affinity for hydrogen decreases in the group
from fluorine to iodine. Which of the
halogen acids should have highest bond
dissociation enthalpy?

Which of the following oxyacid does not contain \(\mathrm{P}-\mathrm{O}-\mathrm{P}\) bond?

\(\mathop {8N{H_3}}\limits_{(Excess)} + 3C{l_2}\buildrel {} \over \longrightarrow X\)
\(N{H_3} + \mathop {3C{l_2}}\limits_{(Excess)} \buildrel {} \over \longrightarrow Y\)
What is X and Y in the above reaction?

Which of the following products will be obtained when copper metal is reacted with \(\mathrm{HNO}_3\) ?

A green yellow gas reacts with an alkali
metal hydroxide to form a halate which can
be used in fireworks and safety matches. The
gas and halate are, respectively

Assertion (A) \(\mathrm{N}_2\) is less reactive than \(\mathrm{P}_4\).
Reason (R) Nitrogen has more electron gain enthalpy than phosphorus.

Assertion (A) \(\mathrm{NaCl}\) reacts with concentrated \(\mathrm{H}_2 \mathrm{SO}_4\) to give colourless fumes with pungent smell. But on adding \(\mathrm{MnO}_2\) the fumes become greenish yellow.
Reason (R) \(\mathrm{MnO}_2\) oxidises $...

In which of the following arrangements, the
order is not strictly according to the property
written against it?

The ionic radii \((\mathop A\limits^o)\) of \(\mathrm{C}^{4-}\) and \(\mathrm{O}^{2-}\) respectively are 2.60 and 1.40. The ionic radius of the isoelectronic ion \(\mathrm{N}^{3-}\) would be

Assertion (A) Electron gain enthalpy
becomes less negative as we go down a group.
Reason (R) Size of the atom increases on
going down the group and the added electron
would be farther away from the nucleus.

In the above reaction sequence, \(X\) is

Assertion (A) The molecular mass of the
polymers cannot be calculated using the
boiling point or freezing point method.
Reason (R) The freezing point method is
used for determining the molecular mass of
small molecules.

Assertion (A) Most of the synthetic
polymers are not biodegradable.
Reason (R) Polymerisation process induces
toxic polymerisation.

Assertion (A) Beryllium carbonate is kept
in the atmosphere of carbon dioxide.
Reason (R) Beryllium carbonate is unstable
and decomposes to give beryllium oxide and
carbon dioxide.

Which of the following is an example of network solid?

Niobium crystallises in body centred cubic structure. If density is \(8.55 \mathrm{~g} \mathrm{~cm}^{-3}\), then the atomic radius of niobium is (atomic mass of niobium \(=93 u\) )