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Recent questions and answers in 2016

Questions >> JEEMAIN and NEET >> NEET PAST PAPERS >> 2016

In the correct <br> $X - C \equiv CH \xrightarrow[\text{(2) $CH_3CH_2Br$}]{\text{(1) $NaNH_2 / liq. NH_3$}} X \xrightarrow[\text{(2) $CH_3CH_2Br$}]{\text{$(1) NaNH_2 / liq.NH_3$}}$ <br> X and Y are:

answered Mar 25, 2020 by meena.clay6

1 answer

Which of the following biphenyls is optically active ?

answered Mar 25, 2020 by meena.clay6

2 answers

The rate of a first order reaction is $0.04 \; mol\; l^{-1} s^{-1}$ at 10 seconds and $0.03 \; mol\; l^{-1}\; s^{-1}$ at 20 seconds after initiation of the reaction. The half-life period of the reaction is :

answered Mar 25, 2020 by meena.clay6

1 answer

The ionic radii of $A^+$ and $B^–$ ions are $0.98 \times 10^{–10}$ m and $1.81 \times 10^{–10}$ m. The coordination number of each ion in AB is :

answered Mar 25, 2020 by meena.clay6

1 answer

Consider the following liquid-vapour equilibrium <br> $Liquid \rightleftharpoons Vapour$ <br> Which of the following relations is correct ?

answered Mar 25, 2020 by meena.clay6

1 answer

Which of the following statement about hydrogen is incorrect ?

answered Mar 25, 2020 by meena.clay6

1 answer

Which one given below is a non-reducing sugar ?

answered Mar 25, 2020 by meena.clay6

2 answers

The correct statement regarding RNA and DNA respectively is :

answered Mar 25, 2020 by meena.clay6

1 answer

The pressure of $H_2$ required to make the potential of $H_2$-electrode zero in pure water at $298$ K is :

answered Mar 25, 2020 by meena.clay6

1 answer

The product formed by the reaction of an aldehyde with a primary amine is :

answered Mar 24, 2020 by meena.clay6

1 answer

Consider the nitration of benzene using mixed conc. $H_2SO_4$ and $HNO_3$. If a large amount of $KHSO_4$ is added to the mixture, the rate of nitration will be :

answered Mar 24, 2020 by meena.clay6

1 answer

$MY$ and $NY_3$, two nearly insoluble salts, have the same KSP values of $6.2 \times 10^{–13}$ at room temperature. Which statement would be true in regard to $MY$ and $NY_3$ ?

answered Mar 24, 2020 by meena.clay6

1 answer

Among the following the correct order of acidity is :

answered Mar 24, 2020 by meena.clay6

1 answer

Which of the following has longest $C – O$ bond length ? (Free $C – O$ bond length in $CO$ is $1.128 Å$)

answered Mar 24, 2020 by meena.clay6

1 answer

Which of the following statements about the composition of the vapour over an ideal 1 : 1 molar mixture of benzene and toluene is correct ? Assume that the temperature is constant at $25^oC$. (Given, Vapour Pressure Data at $25^oC$, benzene = 12.8 kPa, toluene = 3.85 kPa)

answered Mar 24, 2020 by meena.clay6

1 answer

Lithium has a bcc structure. Its density is $530\; kg\; m^{–3}$ and its atomic mass is $6.94\; g \;mol^{–1}$. Calculate the edge length of a unit cell of Lithium metal. (NA = $6.02 \times 10^{23} mol^{–1}$)

answered Mar 24, 2020 by meena.clay6

1 answer

Equal moles of hydrogen and oxygen gases are placed in a container with a pin-hole through which both can escape. What fraction of the oxygen escapes in the time required for one-half of the hydrogen to escape ?

answered Mar 24, 2020 by meena.clay6

1 answer

Which one of the following orders in correct for the bond dissociation enthalpy of halogen molecules ?

answered Mar 24, 2020 by meena.clay6

1 answer

Fog is a colloidal solution of :

answered Mar 24, 2020 by meena.clay6

1 answer

The product obtained as a result of a reaction of nitrogen with $CaC_2$ is

answered Mar 24, 2020 by meena.clay6

1 answer

Which of the following reagents would distinguish cis-cyclopenta-1, 2-diol from the trans-isomer ?

answered Mar 24, 2020 by meena.clay6

1 answer

In Which of the following options the order of arrangement does not agree with the variation of property indicate against it ?

answered Mar 24, 2020 by meena.clay6

1 answer

Natural rubber has :

answered Mar 24, 2020 by meena.clay6

1 answer

The correct thermodynamic conditions for the spontaneous reaction at all temperatures is :

answered Mar 24, 2020 by meena.clay6

1 answer

Which one of the following statements is correct when $SO_2$ is passed through acidified $K_2Cr_2O_7$ solution ?

answered Mar 24, 2020 by meena.clay6

1 answer

Consider the molecules $CH_4, NH_3$ and $H_2O$. Which of the given statements is false?

answered Mar 24, 2020 by meena.clay6

1 answer

The pair of electron in the given carbanion, $CH_3 C \equiv C^{\Theta}$, is present in which of the following orbitals ?

answered Mar 24, 2020 by meena.clay6

1 answer

Which is the correct statement for the given acids ?

answered Mar 24, 2020 by meena.clay6

1 answer

Which of the following is an analgesic ?

answered Mar 24, 2020 by meena.clay6

2 answers

In a protein molecule various amino acids are linked together by:

answered Mar 24, 2020 by meena.clay6

1 answer

The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha-carbon, is:

answered Mar 24, 2020 by meena.clay6

1 answer

Match the compounds given in column I with the hybridisation and shape given in column II and mark the correct option. <br>

answered Mar 24, 2020 by meena.clay6

1 answer

Which one of the following characteristics is associated with adsorption ?

answered Mar 24, 2020 by meena.clay6

1 answer

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane, is:

answered Mar 24, 2020 by meena.clay6

1 answer

At $100^oC$ the vapour pressure of a solution of $6.5 \;g$ of a solute in $100\; g$ water is $732\; mm$. If $K_b = 0.52$, the boiling point of this solution will be:

answered Mar 24, 2020 by meena.clay6

1 answer

The electronic configurations of Eu (Atomic No. 63), Gd(Atomic No. 64) and Tb (Atomic No. 65) are:

answered Mar 24, 2020 by meena.clay6

1 answer

The reaction <br> <br> can be classified as :

answered Mar 23, 2020 by meena.clay6

1 answer

Two electrons occupying the same orbital are distinguished by:

answered Mar 23, 2020 by meena.clay6

1 answer

For the following reactions: <br> <br> Which of the following statements is correct ?

answered Mar 23, 2020 by meena.clay6

1 answer

When copper is heated with conc. $HNO_3$ it produces:

answered Mar 23, 2020 by meena.clay6

1 answer

The correct statement regarding the basicity of arylamines is:

answered Mar 23, 2020 by meena.clay6

1 answer

Predict the correct order among the following:

answered Mar 23, 2020 by meena.clay6

1 answer

The addition of a catalyst during a chemical reaction alters which of the following quantities ?

answered Mar 23, 2020 by meena.clay6

2 answers

Which of the following statements is false ?

answered Mar 9, 2020 by sharmaaparna1

1 answer

Match item of Column I with the items of Column II and assign the correct code : <br>

answered Mar 6, 2020 by sharmaaparna1

1 answer

The angle of incidence for a ray of light at a refracting surface of a prism is $45^o$. The angle of prism is $60^o$. If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism respectively, are :

answered Feb 15, 2020 by priyanka.clay6

1 answer

A particle of mass 10 g moves along a circle of radius 6.4 cm with a constant tangential acceleration. What is the magnitude of this acceleration if the kinetic energy of the particle becomes equal to $8 \times 10^{–4} J$ by the end of the second revolution after the beginning of the motion ?

answered Feb 15, 2020 by priyanka.clay6

1 answer

A refrigerator works between $4^oC$ and $30^oC$. It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is : (Take 1 cal = 4.2 Joules)

answered Feb 15, 2020 by priyanka.clay6

1 answer

When an $\alpha$-particle of mass 'm' moving with velocity 'v' bombards on a heavy nucleus of charge 'Ze', its distance of closest approach from the nucleus depends on m as :

answered Feb 15, 2020 by priyanka.clay6

1 answer

An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is :

answered Feb 14, 2020 by priyanka.clay6

1 answer

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