NEET 2016 Chemistry Questions

Consider the molecules \ce{CH4}, \ce{NH3} and \ce{H2O}. Which of the given statements is false?

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

Predict the correct order among the following (repulsion between electron pairs as per VSEPR theory):

Match the compounds in Column I with the hybridization and shape in Column II and mark the correct option. Column I: (a) \ce{XeF6}, (b) \ce{XeO3}, (c) \ce{XeOF4}, (d) \ce{XeF4} Column II: (i) Distorted octahedral, (ii) Square planar, (iii) Pyramidal, (iv) Square pyramidal

The lone pair of electrons in the given carbanion, \ce{CH3-C#C^-}, is present in which of the following orbitals?

Which one of the following compounds shows the presence of intramolecular hydrogen bond?

The hybridizations of the atomic orbitals of nitrogen in \ce{NO2+}, \ce{NO3^-} and \ce{NH4+} respectively are

Which of the following pairs of ions is isoelectronic and isostructural?

The correct geometry and hybridization for \ce{XeF4} are

Among the following, which one is a wrong statement?

Which of the following pairs of compounds is isoelectronic and isostructural?

Choose the correct statement:

Which of the following statements is not correct about diborane?

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

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

The reaction shown in the scheme can be classified as:

Which of the following biphenyls is optically active?

For the following reactions: (a) \ce{CH3CH2CH2Br + KOH -> CH3CH=CH2 + KBr + H2O} (b) a bromo-dimethylcyclohexane + \ce{KOH} gives the corresponding hydroxy-dimethylcyclohexane (\ce{Br} replaced by \ce{OH}) (c) \ce{cyclohexene + Br2 ->} 1,2-dibromocyclohexane Which of the following statements is correct?

The correct statement regarding the basicity of aryl amines is:

The pair of electrons in the given carbanion, \ce{CH3-C#C^-}, is present in which of the following orbitals?

Which of the following can be used as the halide component for a Friedel-Crafts reaction?

In which of the following molecules are all atoms coplanar?

Which among the given bicyclic ketone molecules (I), (II) and (III) can exhibit tautomerism?

The correct order of strengths of the carboxylic acids (I), (II) and (III) is:

In the reaction \ce{HC#CH ->[\text{(1) }NaNH2/\text{liq }NH3][\text{(2) }CH3CH2Br] X ->[\text{(1) }NaNH2/\text{liq }NH3][\text{(2) }CH3CH2Br] Y}, X and Y are:

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

The pair of electrons in the given carbanion, \ce{CH3-C#C^-}, is present in which of the following orbitals?

In which of the following molecules are all atoms coplanar?

The compound that will react most readily with gaseous bromine has the formula

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

Consider the following liquid–vapour equilibrium: $\ce{Liquid <=> Vapour}$. Which of the following relations is correct?

For a sample of perfect gas when its pressure is changed isothermally from $p_i$ to $p_f$, the entropy change is given by

If the $E^\circ_{cell}$ for a given reaction has a negative value, which of the following gives the correct relationships for the values of $\Delta G^\circ$ and $K_{eq}$?

The electronic configurations of \ce{Eu} (Atomic no. 63), \ce{Gd} (Atomic No. 64) and \ce{Tb} (Atomic No. 65), respectively, are:

Two electrons occupying the same orbital are distinguished by:

How many electrons can fit in the orbital for which $n=3$ and $l=1$?

Which of the following pairs of $d$-orbitals will have electron density along the axes?

Which one of the following statements is correct when \ce{SO2} is passed through acidified \ce{K2Cr2O7} solution?

Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour?

In which of the following options the order of arrangement does NOT agree with the variation of property indicated against it?

Which of the following is correctly matched?

Suppose the elements X and Y combine to form two compounds \ce{XY2} and \ce{X3Y2}. When 0.1 mole of \ce{XY2} weighs 10 g and 0.05 mole of \ce{X3Y2} weighs 9 g, the atomic weights of X and Y respectively are

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

The correct statement regarding RNA and DNA, respectively is:

Which one given below is a non-reducing sugar?

The central dogma of molecular genetics states that the genetic information flows from:

The correct corresponding order of names of the four aldoses with the configurations (1)–(4) shown below, respectively, is:

Which one of the following statements is not correct?

Which of the following statements is not correct?

The pressure of \ce{H2} required to make the potential of the \ce{H2} electrode zero in pure water at $298\ \text{K}$ is:

The molar conductivity of a $0.5\ \text{mol dm}^{-3}$ solution of \ce{AgNO3} with electrolytic conductivity of $5.76 \times 10^{-3}\ \text{S cm}^{-1}$ at $298\ \text{K}$ is

During the electrolysis of molten sodium chloride, the time required to produce $0.10$ mol of chlorine gas using a current of $3$ amperes is

If the $E^\circ_{cell}$ for a given reaction has a negative value, which of the following gives the correct relationships for the values of $\Delta G^\circ$ and $K_{eq}$?

The number of electrons delivered at the cathode during electrolysis by a current of $1$ ampere in $60$ seconds is (charge on electron $= 1.60 \times 10^{-19}$ C)

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because

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

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

The correct structure of the product $A$ formed in the following reaction is: \ce{cyclohex-2-en-1-one ->[{H2 (1 atm)}][{Pd/C, EtOH}] A}

Which among the following molecules (I, II, III) can exhibit tautomerism?

The correct order of strengths of the following carboxylic acids is: (I) cyclohexanecarboxylic acid; (II) a tetrahydropyran-carboxylic acid in which the ring oxygen lies close (beta) to the \ce{-COOH}-bearing carbon; (III) a tetrahydropyran-carboxylic acid in which the ring oxygen lies far (gamma, across the ring) from the \ce{-COOH}-bearing carbon.

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 °C. (Given vapour pressure data at 25 °C, \ce{C6H6} = 12.8 kPa, \ce{C6H5CH3} = 3.85 kPa)

At 100 °C 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:

The van't Hoff factor ($i$) for a dilute aqueous solution of the strong electrolyte barium hydroxide is

Which one of the following is incorrect for an ideal solution?

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

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

The decomposition of phosphine \ce{PH3} on tungsten at low pressure is a first-order reaction. It is because the

Which one of the following statements is \textbf{not} correct?

For the following reactions: (a) $\ce{CH3CH2CH2Br + KOH(alc) -> CH3CH=CH2 + KBr + H2O}$ (b) $\ce{CH3CHBrCH2CH3 + KOH(aq) -> CH3CH(OH)CH2CH3 + KBr}$ (c) $\ce{C6H10(cyclohexene) + Br2 -> }$ trans-1,2-dibromocyclohexane Which of the following statements is correct?

Which of the following can be used as the halide component for a Friedel-Crafts (alkylation) reaction?

Which of the following compounds shall NOT produce propene by reaction with $\ce{HBr}$ followed by elimination, or by direct elimination only?

Which one of the following statements is correct when \ce{SO2} is passed through acidified \ce{K2Cr2O7} solution?

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

Which one of the following statements related to lanthanons is incorrect?

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

The correct increasing order of trans-effect of the following species is:

Jahn-Teller effect is not observed in high spin complexes of:

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

The correct statement regarding the basicity of aryl amines is:

A given nitrogen-containing aromatic compound $A$ reacts with $\ce{Sn/HCl}$, followed by $\ce{HNO2}$, to give an unstable compound $B$. $B$, on treatment with phenol, forms a beautiful coloured compound $C$ with molecular formula $\ce{C12H10N2O}$. The structure of compound $A$ is

The reaction \ce{R-ONa + R'-X -> R-O-R' + NaX} can be classified as: