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Questions >> JEEMAIN and NEET >> Chemistry >> Chemical Bonding and Molecular Structure

If the reaction rate at a given temperature becomes slower. then

answered Mar 3, 2019 by ravindrarubysingh

2 answers

Which of the following compounds does not obey the octet rule?

answered Jul 24, 2017 by zolyrodriguez60927

2 answers

Shape of $DCl_4$ is

answered Jan 18, 2016 by meena.p

1 answer

Which is the correct order of second ionisation energy ?

answered Jan 18, 2016 by meena.p

1 answer

correct ordering for the dipole moments of: CO2,BF3,H2O,H2S is?

answered May 30, 2015 by sharmaaparna1

1 answer

Why group 2 elements have stronger metallic bonding than group 1 elements?

answered Jan 21, 2015 by sharmaaparna1

1 answer

why sand is used to extinguish fire during wars and not water?

answered Jan 21, 2015 by sharmaaparna1

1 answer

pi bond is formed,

answered Apr 7, 2014 by meena.p

1 answer

The type of bonds present in $CuSO_4.5H_2O$ are only

answered Apr 7, 2014 by meena.p

1 answer

An atom of one element A has four electrons in its outermost shell, and that of B has six electrons in the outermost shell. The formula of the compound formed by these two will be

answered Apr 7, 2014 by meena.p

1 answer

Among $CaH_2,NH_3,NaH$ and $B_2 H_6$ which are covalent hydride ?

answered Apr 7, 2014 by meena.p

1 answer

Among the following which has the most polar character.

answered Apr 4, 2014 by meena.p

1 answer

A section of the periodic table is given below elements A , B and X, Y in two groups. Which of the bonds given below is the least polar.

answered Apr 4, 2014 by meena.p

1 answer

p- bonding occurs in each of the following except

answered Apr 4, 2014 by meena.p

1 answer

The enolic form of acetone contains

answered Apr 4, 2014 by meena.p

1 answer

Rate of a chemical reaction can be kept constant by

answered Apr 4, 2014 by meena.p

1 answer

The rate of a gaseous reaction is given by the expression $k[A][B]$ . If the volume of the reaction vessel is suddenly reduced to $\large\frac{1}{4}$ th of the initial volume , the reaction rate relating to original rate will be

answered Apr 4, 2014 by meena.p

1 answer

Diazonium salt decomposes as $C_6H_5N^{+}_2CL^{-} \longrightarrow C_6H_5Cl+N_2$

answered Apr 4, 2014 by meena.p

1 answer

The minimum energy required for molecules to enter into chemical reaction is called

answered Apr 4, 2014 by meena.p

1 answer

The molecularity of the reaction $6FeSO_4+3H_2SO_4+KClO_3 \longrightarrow KCl +3 Fe_2(SO_4)_3+3H_2O$ is

answered Apr 4, 2014 by meena.p

1 answer

$N_2$ and $O_2$ are converted into monoanions $N_2^{-}$ and $O_2^{-}$ respectively which of the following statem is wrong ?

answered Apr 4, 2014 by meena.p

1 answer

Bond order of $N-O$ bonds in nitrate ions is :

answered Apr 4, 2014 by meena.p

1 answer

The dipole moment of $KCl$ is $3.336 \times 10^{-29}$ coulomb meter which indicates that it is a highly polar molecule. The inter atomic distance between $K^+$ and $Cl^{-}$ in this molecule is $2.6 \times 10^{-10}\;m$ Calculate the dipole moment of $KCl$ molecular if there were opposite charges of one fundamental unit located at each nucleus. Calculate percentage ionic character of $KCl$

answered Apr 4, 2014 by meena.p

1 answer

calculate the lattice energy of $KI,$ given that enthalphy of (i) sublimation of K is $90\;K\;J mol^{-1}$ , (ii) dissociation of $I_2$ to $I^{-}$ is $213\;kJmol^{-1}$ (iii) ionisation of K to $K^{+}$ is $415\;kJ mol^{-1}$ (iv) electron affinity for I to $I^{-}$ is $-294.6 \;KJ\;mol^{-1}$ and $SH_f$ overall is $-327\;kJ\;mol^{-1}$

answered Apr 4, 2014 by meena.p

1 answer

The experimental dipole moment of water molecule is $1.84\;D$ . Calculate the bond angle $H-O-H$ in water molecule , if dipole moment of OH bond is $1.5\;D$

answered Apr 4, 2014 by meena.p

1 answer

A diatomic molecule has a dipole moment equal to $1.2 \;D$ , If bond length is $1.0\;a^{\circ}$ What fraction of electronic charge 'e' exists on each atom ?

answered Apr 4, 2014 by meena.p

1 answer

Which of the following are isoelectronic and isostructural ? $NO_3^{-},CO_3^{2-}, ClO_3^{-},SO_3$

answered Apr 4, 2014 by meena.p

1 answer

A square planar complex is formed by hybridisation of which atomic orbitals ?

answered Apr 4, 2014 by meena.p

1 answer

Identify the least stable ion amongst the following :

answered Apr 4, 2014 by meena.p

1 answer

Statement 1: Band gap in germanium is small. Statement 2 : The energy spread of each germanium atomic energy level in infinitesimally small.

answered Apr 4, 2014 by meena.p

1 answer

Statement 1: p-hydroxybenzonic acid has a lower boiling point than $O- hydroxybenzonic acid. Statement 2: O-Hydroxybenzonic acid has intramolecular hydrogen bonding.

answered Apr 4, 2014 by meena.p

1 answer

Statement 1: $LiCl$ is predominantly a covalent compound. Statement 2: Electronegativity difference between $Li$ and $Cl$ is too small.

answered Apr 4, 2014 by meena.p

1 answer

Which one is most ionic?

answered Apr 4, 2014 by meena.p

1 answer

According to molecular orbitals theory which of the following statement about the magnetic character and bond order is correct regarding $O_2^{+}$ ?

answered Apr 4, 2014 by meena.p

1 answer

Among the following compounds the one that is polar and has the central atom with $SP^2$ hybridisation is

answered Apr 4, 2014 by meena.p

1 answer

The type of hybrid orbitals used by the chlorine atom in $ClO^{-}_2$ is

answered Apr 4, 2014 by meena.p

1 answer

If a molecule $M X_3$ has zero dipole moment. the sigma bonding orbitals used by M. (atomic number <21) are

answered Apr 3, 2014 by meena.p

1 answer

The rate law of a reaction $A+B \to$ product is rate $=K [A]^n[B]^m$ . On doubling the concentration of A and halving the concentration of B. Thr ratio of new rate to the earlier rate of reaction will be :

answered Apr 3, 2014 by meena.p

1 answer

Units of rate constant of first and zero order reaction in terms of molarity M are respectively :

answered Apr 3, 2014 by meena.p

1 answer

$t \large\frac{1}{4}$ can be taken as the time taken for concentration of reactant to drop to $\large\frac{3}{4}$ of its initial value. If the rate constant for a first order reaction is $K,$ then $t \large\frac{1}{4}$ can be written as

answered Apr 3, 2014 by meena.p

1 answer

The half - life period of a first order chemical reaction is $6.93$ minutes. The time required for the completion of $99\%$ of the chemical reaction will be $(\log 2 =0.301)$

answered Apr 3, 2014 by meena.p

1 answer

If I is the intensity of absorbed light and C is the concentration of AB for the photochemical process $AB+hr \to AB^ x$ the rate of formation of $AB^x$ is directly proportional X :

answered Apr 3, 2014 by meena.p

1 answer

The temperature coefficient of a reaction is :

answered Apr 3, 2014 by meena.p

1 answer

The lightening of fire files is :

answered Apr 3, 2014 by meena.p

1 answer

Large increase in the rate of reaction due to rise in temperature is due to :

answered Apr 3, 2014 by meena.p

1 answer

One Einstein = N $\times$ quanta of energy where N is :

answered Apr 3, 2014 by meena.p

1 answer

For an endothermic reaction where $\Delta H$ represents the enthalpy of the reaction in $kj/mol$ . the minimum value for the energy of activation will be

answered Apr 3, 2014 by meena.p

1 answer

The rate of a reaction gets doubled when the temperature changes from $7^{\circ}C$ to $17^{\circ}$ . By what factor will it change for the temperature change from $17^{\circ}C$ to $27^{\circ}C$

answered Apr 3, 2014 by meena.p

1 answer

For a first order reaction , the plot of t against log C gives a straight with slope equal to :

answered Apr 3, 2014 by meena.p

1 answer

Half- life $(t_1)$ of the first order reaction and half-life $(t_2)$ of the second order reaction are equal. Hence ratio of the rate of the rate at te start of the reaction.

asked Apr 3, 2014 by meena.p

1 answer

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