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Recent questions and answers in 2014

Questions >> JEEMAIN and NEET >> NEET PAST PAPERS >> 2014

What products are formed when the following compound is treated with $Br_2$ in the presence of $FeBr_3$ ? <br>

answered Mar 17, 2020 by meena.clay6

1 answer

Among the following sets of reaction which one produces anisole?

answered Mar 17, 2020 by meena.clay6

1 answer

Which of the following will not be soluble in sodium hydrogen carbonate?

answered Mar 17, 2020 by meena.clay6

1 answer

Which one is most reactive towards Nucleophilic addition reaction ?

answered Mar 17, 2020 by meena.clay6

2 answers

Identity Z in the sequence of reactions : <br> $CH_3 CH_2 CH = CH_2 \xrightarrow{HBr/H_2O_2} Y \xrightarrow{C_2H_5ONa} Z$

answered Mar 17, 2020 by meena.clay6

1 answer

Which of the following organic compounds has same hybridization as its combustion product -($CO_2$)?

answered Mar 17, 2020 by meena.clay6

1 answer

Which of the following compounds will undergo racemisation when solution of KOH hydrolysis? <br>

answered Mar 17, 2020 by meena.clay6

1 answer

In the Kjedahl's method for estimation of nitrogen present in soil sample, ammonia evolved from 0.75g of sample neutralized 10 ml. of 1M $H_2SO_4$ The percentage of nitrogen in the soil is:

answered Mar 16, 2020 by meena.clay6

1 answer

Which one of the following is not a common component of Photochemical Smog?

answered Mar 16, 2020 by meena.clay6

2 answers

Which of the following organic compounds polymerizes to form the polyester Dacron?

answered Mar 16, 2020 by meena.clay6

1 answer

Which one of the following is an example of a thermosetting polymer?

answered Mar 16, 2020 by meena.clay6

1 answer

Which of the following hormones is produced under the condition of stress which stimulates glycogenolysis in the liver of human being?

answered Mar 16, 2020 by meena.clay6

1 answer

D(+) glucose reacts with hydroxyl amine and yield an oxime. The structure of the oxime would be:

answered Mar 16, 2020 by meena.clay6

1 answer

Which of the following will be most stable diazonium salt $RN_2^+X^-$?

answered Mar 16, 2020 by meena.clay6

1 answer

In the following reaction, the product (A) <br>

answered Mar 16, 2020 by meena.clay6

1 answer

Reason of lanthanoid contraction is :

answered Mar 16, 2020 by meena.clay6

1 answer

Among the following complexes the one which shows Zero crystal field stabilizations energy (CFSE) :

answered Mar 16, 2020 by meena.clay6

2 answers

Magnetic moment 2.83 BM is given by which of the following ions? <br> (At. nos. Ti = 22, Cr = 24, Mn = 25, Ni = 28)

answered Mar 16, 2020 by meena.clay6

2 answers

The reaction of aqueous $KMnO_4$ with $H_2O_2$ in acidic conditions gives :

answered Mar 13, 2020 by meena.clay6

1 answer

Artificial sweetner which is stable under cold conditions only is :

answered Mar 13, 2020 by meena.clay6

1 answer

(a) $H_2O_2 + O_3 \to H_2O + 2O_2$ (b) $H_2O_2 + Ag_2O \to 2Ag +H_2O + O_2$ Role of hydrogen peroxide in the above reactions is respectively :

answered Mar 13, 2020 by meena.clay6

1 answer

Acidity of diprotic acids in aqueous solutions increases in the order:

answered Mar 2, 2020 by meena.clay6

1 answer

Which one of the following species has plane triangular shape?

answered Mar 2, 2020 by meena.clay6

1 answer

Which of the following molecules has the maximum dipole moment?

answered Mar 2, 2020 by meena.clay6

1 answer

$Be^{2+}$ is isoelectronic with which of the following ions?

answered Mar 2, 2020 by meena.clay6

1 answer

The pair of compounds that can exist together is:

answered Mar 2, 2020 by meena.clay6

1 answer

1.0 g of magnesium is burnt with 0.56 g $O_2$ in a closed vessel. Which reaction is left in excess and how much? (At, wt.Mg = 24; O = 16)

answered Mar 2, 2020 by meena.clay6

1 answer

Which of the following orders of ionic radii is correctly represented?

answered Mar 2, 2020 by meena.clay6

1 answer

For a given exothermic reaction, $K_P$ and $K_P'$ are the equilibrium constants at temperatures $T_1$ and $T_2$ respectively. Assuming that heat of reaction is constant in temperatures range between $T_1$ and $T_2$ , it is readily observation that:

answered Mar 2, 2020 by meena.clay6

1 answer

For the reaction : <br> $X_2O_4 (l) \to 2XO_2 (g)$ <br> $\Delta U = 2.1 \; k \; cal, \; \Delta s = 20 \; cal \; K^{-1} $ at $300 K$

answered Mar 2, 2020 by meena.clay6

1 answer

For the reversible reaction : $N_2 (g) + 3H_2(g) \leftrightharpoons 2NH_3 (g) + heat$ <br> The equilibrium shifts in forward direction -

answered Feb 27, 2020 by meena.clay6

1 answer

Which of the following statements is correct for the spontaneous adsorption of a gas?

answered Feb 27, 2020 by meena.clay6

1 answer

Using the Gibbs change, $\Delta G^o = + 63.3 \;kJ$, for the following reaction, $Ag_2CO_3 (g) \leftrightharpoons 2 Ag^+ (aq) + CO^{2-}_3 (aq)$ the $K_{sp}$ of $Ag_2CO_3 (s)$ in water at $25^oC$ is ($R = 8.314 \; JK^{-1} mol^{-1}$)

answered Feb 27, 2020 by meena.clay6

1 answer

When 0.1 mol $MnO_4^{2-}$ is oxidised the quantity of electricity required to completely $MnO_4^{2-}$ to $MnO_4^-$ is -

answered Feb 27, 2020 by meena.clay6

1 answer

When 22.4 litres of $H_2(g) $ is mixed with 11.2 litres of $Cl_2 (g)$, each at STP, the moles of $HCl(g) $ formed is equal to -

answered Feb 27, 2020 by meena.clay6

1 answer

Of the following 0.1 M aqueous solutions, which one will exhibit the largest freezing point depression ?

answered Feb 27, 2020 by meena.clay6

1 answer

Which of the following salts will give highest pH in water?

answered Feb 26, 2020 by meena.clay6

1 answer

If the kinetic energy of the particle is increased to 16 times its previous value, the percentage change in the de-Broglie wavelength of the particle is:

answered Feb 11, 2020 by priyanka.clay6

1 answer

Which property of colloids is not dependent on the charge on colloidal particles?

answered Feb 5, 2020 by meena.clay6

1 answer

If a the length of the side of a cube, the distance between the body centered atom one corner atom in the cube will be -

answered Feb 5, 2020 by meena.clay6

1 answer

Equal masses of $H_2, O_2$ and methane have been taken in a container of volume V at temperature $27^oC$ in identical conditions. The ratio of the volumes of gases $H_2: O_2: methane$ would be -

answered Feb 5, 2020 by meena.clay6

1 answer

Calculate the energy in corresponding to light of wavelength 45nm : (Planck's constant $h = 6.63 \times 10^{-34} Js$ : speed of light $c = 3 \times 10^8 ms^{-1}$)

answered Feb 5, 2020 by meena.clay6

1 answer

What is the maximum number of orbitals that can be identified with the following quantum number n = 3, $\ell$ = 1, m = 0

answered Feb 5, 2020 by meena.clay6

1 answer

The barrier potential of a p-n junction depends on :<br> (a) type of semi conductor material <br> (b) amount of doping <br> (c) temperature <br> Which one of the following is correct?

answered Feb 5, 2020 by priyanka.clay6

1 answer

The given graph represents V-I characteristic for a semiconductor device. <br> <br> Which of the following statement is correct?

answered Feb 5, 2020 by priyanka.clay6

1 answer

A radio isotope 'X' with a half life $1.4 \times 10^9$ years decays to 'Y' which is stable. A sample of the rock from a cave was found to contain 'X' and 'Y' in the ratio 1 : 7. The age of the rock is :

answered Feb 5, 2020 by priyanka.clay6

1 answer

The Binding energy per nucleon of $_3^7Li$ and $_2^4 He$ nucleon are 5.60 MeV and 7.06 MeV, respectively. In the nuclear reaction $_3^7Li + _1^1 He \to _2^4 He + _2^4 He + Q, $ the value of energy $Q$ released is :

answered Feb 5, 2020 by priyanka.clay6

1 answer

Hydrogen atom in ground state is excited by a monochromatic radiation of $\lambda= 975 A^o$. Number of spectral lines in the resulting spectrum emitted will be :

answered Feb 5, 2020 by priyanka.clay6

1 answer

When the energy of the incident radiation is increased by $20%$, the kinetic energy of the photoelectrons emitted from a metal surface increased from emitted 0.5 eV to 0.8eV. The work function of the metal is :

answered Feb 5, 2020 by priyanka.clay6

1 answer

If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain ? <br> plant $\to$ mice $\to$ snake $\to$ peacock

asked Aug 20, 2018 by pady_1

1 answer

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