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Recent questions and answers in 2019

Questions >> JEEMAIN and NEET >> NEET PAST PAPERS >> 2019

A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4 then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population ?

answered May 15, 2020 by sreenithiya21

2 answers

Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for:

answered May 12, 2020 by hibasharafudheen05

2 answers

DNA precipitation out of a mixture of biomolecules can be achieved by treatment with :

answered May 12, 2020 by hibasharafudheen05

2 answers

Drug called 'Heroin' is synthesized by :

answered May 12, 2020 by hibasharafudheen05

2 answers

Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to :

answered May 12, 2020 by hibasharafudheen05

2 answers

It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?

answered May 12, 2020 by hibasharafudheen05

2 answers

The ciliated epithelial cells are required to move particles or mucus in a specific direction. In humans, these cells are mainly present in :

answered May 12, 2020 by hibasharafudheen05

2 answers

Select correctly written scientific name of Mango which was first described by Carolus Linnaeus:

answered May 12, 2020 by hibasharafudheen05

2 answers

The correct structure of tribromooctaoxide is :-

answered Apr 6, 2020 by meena.clay6

2 answers

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

answered Apr 6, 2020 by meena.clay6

1 answer

The most suitable reagent for the following conversion is :-

answered Apr 6, 2020 by meena.clay6

1 answer

The compound that is most difficult to protonate is:-

answered Apr 6, 2020 by meena.clay6

1 answer

The method used to remove temporary hardness of water is :

answered Apr 6, 2020 by meena.clay6

2 answers

What is the correct electronic configuration of the central atom in $K_4[Fe(CN)_6]$ based on crystal field theory?

answered Apr 6, 2020 by meena.clay6

1 answer

For the chemical reaction $N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g)$ the correct option is :

answered Apr 6, 2020 by meena.clay6

1 answer

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

answered Apr 6, 2020 by meena.clay6

1 answer

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 :

answered Apr 6, 2020 by meena.clay6

1 answer

The non-essential amino acid among the following is :

answered Apr 6, 2020 by meena.clay6

1 answer

Which of the following is incorrect statement ?

answered Apr 6, 2020 by meena.clay6

1 answer

In which case change in entropy is negative ?

answered Apr 6, 2020 by meena.clay6

1 answer

The mixture that forms maximum boiling azeotrope is :

answered Apr 6, 2020 by meena.clay6

1 answer

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

answered Apr 6, 2020 by meena.clay6

2 answers

Which one is malachite from the following ?

answered Apr 6, 2020 by meena.clay6

1 answer

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

answered Apr 6, 2020 by meena.clay6

1 answer

An alkene "A" on reaction with $O_3$ and $Zn-H_2O$ 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 :-

answered Apr 6, 2020 by meena.clay6

1 answer

Which is the correct thermal stability order for$H_2E$ (E=O, S, Se, Te and Po) ?

answered Apr 6, 2020 by meena.clay6

1 answer

The biodegradable polymer is :-

answered Apr 6, 2020 by meena.clay6

1 answer

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

answered Apr 6, 2020 by meena.clay6

1 answer

Identify the incorrect statement related to $PCl_5$ from the following :-

answered Apr 6, 2020 by meena.clay6

1 answer

If the rate constant for a first order reaction is k,the time (t) required for the completion of 90% of the reaction is given by :-

answered Apr 6, 2020 by meena.clay6

1 answer

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

answered Apr 6, 2020 by meena.clay6

1 answer

The manganate and permanganate ions are tetrahedral, due to

answered Apr 6, 2020 by meena.clay6

1 answer

Which of the following is an amphoteric hydroxide?

answered Apr 6, 2020 by meena.clay6

1 answer

Which of the following species is not stable ?

answered Apr 6, 2020 by meena.clay6

1 answer

Which will make basic buffer ?

answered Apr 6, 2020 by meena.clay6

1 answer

Conjugate base for Bronsted acids $H_2O$ and HF are:-

answered Apr 6, 2020 by meena.clay6

1 answer

Which mixture of the solutions will lead to the formation of negatively charged colloidal $[AgI] I^{-}$ sol. ?

answered Apr 6, 2020 by meena.clay6

1 answer

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

answered Apr 6, 2020 by meena.clay6

1 answer

Among the following, the narrow spectrum antibiotic is

answered Apr 6, 2020 by meena.clay6

1 answer

Which of the following reactions are disproportionation reaction ? (a)$2Cu^{+} \to Cu^{2+}+Cu^0$ (b)$3MnO_4^{2-}+4H^{+} \to 2MnO_4^{-}+MnO_2$ (c)$2KMnO_4 \underrightarrow{\qquad \Delta \qquad } K_2MnO_4 +MnO_2 +O_2$ (d)$2MnO_4^{-}+3Mn^{2+}+2H_2O \longrightarrow 5MnO_2+4H^{\oplus}$ Select the correct option from the following

answered Apr 6, 2020 by meena.clay6

1 answer

Which of the following diatomic molecular species has only $\pi$ bonds according to Molecular Orbital theory?

answered Apr 6, 2020 by meena.clay6

1 answer

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

answered Apr 3, 2020 by meena.clay6

1 answer

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

answered Apr 3, 2020 by meena.clay6

1 answer

For a cell involving one electron$ E^\ominus$ cell = 0.59V at 298 K, the equilibrium constant for the cell reaction is :- $\bigg[Given \;that \frac{2.303RT}{F}=0.059V \;at \;T=298k\bigg]$

answered Apr 3, 2020 by meena.clay6

1 answer

For an ideal solution, the correct option is :-

answered Apr 3, 2020 by meena.clay6

1 answer

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

answered Apr 3, 2020 by meena.clay6

2 answers

pH of a saturated solution of $Ca(OH)_2$ is 9. The solubility product $(K_{sp}) $of $Ca(OH)_2$ is :-

answered Apr 3, 2020 by meena.clay6

1 answer

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 :-

answered Apr 3, 2020 by meena.clay6

1 answer

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

answered Apr 3, 2020 by meena.clay6

1 answer

A particle moving with velocity $\overrightarrow {\rm{V}}$ is acted by three forces shown by the vector triangle PQR. The velocity of the particle will :

asked Jul 10, 2019 by pady_1

2 answers

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