NEET 2019

The structure of intermediate A in the following reaction, is :

The non-essential amino acid among the following is :

The correct structure of tribromooctaoxide is :

The number of sigma (\(\sigma\)) and pi (\(\pi\)) bonds in pent-2-en-4-yne is -

Which of the following diatomic molecular species has only \(\pi\) bonds according to Molecular Orbital Theory?

The manganate and permanganate ions are tetrahedral due to :

If the rate constant for a first order reaction is k, the time (t) required for the completion of 99 % of the
reaction is given by :

For the chemical reaction
N2(g) + 3H2(g) ⇌ 2NH3(g)
the correct option is :

Among the following, the narrow spectrum antibiotic is :

What is the correct electronic configuration of the central atom in K4[Fe(CN)6] based on crystal field theory?

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]