NEET 2019

For a cell involving one electron \(E_{cell}^\Theta\) = 0.59 V at 298 K, the equilibrium constant for the cell reaction is :
[Given that \({{2.303RT} \over F}\) = 0.059 V at T = 298 K ]

For the cell reaction
2Fe3+(aq) + 2I–
(aq) \(\to\) 2Fe2+(aq) + I2(aq)
\({E_{cell}^\Theta }\) = 0.24 V at 298 K. The standard Gibbs energy (\(\Delta\)rGo) of the cell reaction is :
[Given that Faraday constant F = 96500 C mol–1]

Among the following, the one that is not a green house gas is :

A gas at 350 K and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same
conditions. The correct option about the gas and its compressibility factor (Z) is -

The most suitable reagent for the following conversion, is :

Among the following, the reaction that proceeds through an electrophilic substitution, is :

An alkene “A” on reaction with O3 and Zn + H2O gives propanone and ethanal in equimolar ratio. Addition
of HCl to alkene “A” gives “B” as the major product. The structure of product “B” is :

The method used to remove temporary hardness of water is :

Conjugate base for Bronsted acids H2O and HF are :

Which will make basic buffer?

pH of a saturated solution of Ca(OH)2 is 9. The solubility product (Ksp) of Ca(OH)2 is :

The correct order of the basic strength of methyl substituted amines in aqueous solution is :

The major product of the following reaction is :

Which of the following species is not stable?

Which is the correct thermal stability order for H2E (E = O, S, Se, Te and Po)?

Identify the incorrect statement related to PCl5 from the following :

Match the following :

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Match the Xenon compounds in Column-I with its structure in Column-II and assign the correct code :

Which of the following is incorrect statement?

For the second period elements the correct increasing order of first ionization enthalpy is :

The biodegradable polymer is :

Which one is malachite from the following?

Which of the following reactions are disproportionation reaction?
(a) 2Cu+ \(\to\) Cu2+
+ Cu0
(b) 3MnO42- + 4H+ \(\to\) 2MnO4- + MnO2 + 2H2O
(c) 2KMnO4 \(\buildrel \Delta \over \longrightarrow\) K2MnO4 + MnO2 + O2
(d) 2MnO4- + 3Mn2+...

Which of the following is an amphoteric hydroxide?

Enzymes that utilize ATP is phosphate transfer require an alkaline earth metal (M) as the cofactor. M is

A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and
the cations occupy 75% of octahedral voids. The formula of the compound is :

For an ideal solution, the correct option is :

The mixture that forms maximum boiling
azeotrope is :

The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber’s
process is :

The compound that is most difficult to protonate is :

4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is :

Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?

Which mixture of the solution will lead to the formation of negatively charged colloidal [AgI] I– sol. ?

In which case change in entropy is negative?

Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure
of 2 bar. The work done by the gas is [Given that 1 L bar = 100 J]

The total energy of an electron in an atom in an orbit is –3.4 eV. Its kinetic and potential energies are, respectively.

\(\alpha\)-particale consists of :

A parallel plate capacitor of capacitance 20 \(\mu\)F is being charged by a voltage source whose potential is changing at the rate of 3V/s. The conduction current through the connecting wires, and the displacement current through the plat...

Body A of mass 4m moving with speed u collides with another body B of mass 2 m, at rest. The collision is head on and elastic in nature. After the collision the fraction of energy lost by the colliding body A is :

In the circuits shown below, the readings of voltmeters and the ammeters will be :

Which of the following acts as a circuit protection device?

Six similar bulbs are connected as shown in the figure with a DC source of emf E, and zero internal resistance.
The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one...

An electron is accelerated through a potential difference of 10,000 V. Its de Broglie wavelength is (nearly) : (me = 9 \(\times\) 10–31 kg)

In which of the following devices, the eddy current effect is not used?

A 800 turn coil of effective area 0.05 m2 is kept. perpendicular to a magnetic filed 5 × 10–5 T. When the plane of the coil is rotated by 90o around any of its coplanar axis in 0.1 s, the emf induced in the coil will be :

Which colour of the light has the longest wavelength?

Two parallel infinite line charges with linear charge densities +\(\lambda\) C/m and -\(\lambda\) C/m are placed at a distance of 2R in free space. What is the electric field mid-way between the two line charges?

A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre :

Two point charges A and B, having charges +Q and – Q respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges becomes :

Two similar thin equi-convex lenses, of focal length f each, are kept coaxially in contact with each other such that the focal length of the combination is F1. When the space between the two lenses is filled with glycerin (which has the sam...