Recent questions tagged chemical-bonding-and-molecular-structure

Shape of $DCl_4$ is

asked Jan 18, 2016 by meena.p

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Which is the correct order of second ionisation energy ?

asked Jan 18, 2016 by meena.p

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pi bond is formed,

asked Apr 7, 2014 by meena.p

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

asked Apr 7, 2014 by meena.p

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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

asked Apr 7, 2014 by meena.p

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

asked Apr 7, 2014 by meena.p

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Among the following which has the most polar character.

asked Apr 4, 2014 by meena.p

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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.

asked Apr 4, 2014 by meena.p

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p- bonding occurs in each of the following except

asked Apr 4, 2014 by meena.p

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The enolic form of acetone contains

asked Apr 4, 2014 by meena.p

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

asked Apr 4, 2014 by meena.p

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Rate of a chemical reaction can be kept constant by

asked Apr 4, 2014 by meena.p

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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

asked Apr 4, 2014 by meena.p

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

asked Apr 4, 2014 by meena.p

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

asked Apr 4, 2014 by meena.p

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

asked Apr 4, 2014 by meena.p

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

asked Apr 4, 2014 by meena.p

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

asked Apr 4, 2014 by meena.p

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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 $KCl$

asked Apr 4, 2014 by meena.p

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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 $-327\;kJ\;mol^{-1}$

asked Apr 4, 2014 by meena.p

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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 $1.5\;D$

asked Apr 4, 2014 by meena.p

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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 ?

asked Apr 4, 2014 by meena.p

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

asked Apr 4, 2014 by meena.p

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

asked Apr 4, 2014 by meena.p

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Identify the least stable ion amongst the following :

asked Apr 4, 2014 by meena.p

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

asked Apr 4, 2014 by meena.p

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

asked Apr 4, 2014 by meena.p

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

asked Apr 4, 2014 by meena.p

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Which one is most ionic?

asked Apr 4, 2014 by meena.p

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

asked Apr 4, 2014 by meena.p

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

asked Apr 4, 2014 by meena.p

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

asked Apr 3, 2014 by meena.p

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

asked Apr 3, 2014 by meena.p

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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 :

asked Apr 3, 2014 by meena.p

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

asked Apr 3, 2014 by meena.p

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$t \large\frac{1}{4}$ 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

asked Apr 3, 2014 by meena.p

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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 $(\log 2 =0.301)$

asked Apr 3, 2014 by meena.p

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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 :

asked Apr 3, 2014 by meena.p

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The temperature coefficient of a reaction is :

asked Apr 3, 2014 by meena.p

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The lightening of fire files is :

asked Apr 3, 2014 by meena.p

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

asked Apr 3, 2014 by meena.p

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

asked Apr 3, 2014 by meena.p

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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

asked Apr 3, 2014 by meena.p

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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 $27^{\circ}C$

asked Apr 3, 2014 by meena.p

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

asked Apr 3, 2014 by meena.p

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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

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The chemical reaction $2O_3 \to 3O_2$ proceeds as follows : $ O_3 \rightleftharpoons O_2+O ......(fast) \qquad O+O_3 \to 2O_2 ....(slow)$. The rate law expression should be :

asked Apr 3, 2014 by meena.p

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The rate of the elementary reaction, $2NO+O_2 \to 2NO_2$ when the volume of the reaction vessel is doubled

asked Apr 3, 2014 by meena.p

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Which of the following hydrocarbons has the lowest dipole moment?

asked Apr 3, 2014 by meena.p

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Hybridisation is defined as the phenomenon of mixing of orbitals of nearly the same energy so as to redistribute their energies and to give rise to new orbitals of equivalent energy. It is the valence shell atomic which get hybridised one of the electrons from an orbital in the ground state electronic configuration of the atom gets promoted to the next available orbital of higher energy resulting in an excited state electronic configuration with the appropriate number of half filled orbitals. The orbitale in the excited state undergo hybridisation giving hybrid orbilats of equivalent energy. Hybrid orbitals generally from either bonds or contain lone pair of electrons, they do not form $\pi$ bonds. Depending on the type of orbitals used the hybridisation may be categorized as $SP$(linear), $SP^2$ (trigonal planar ), $SP^3$(tetrahedral), $SP^3d$(trigonal bipyramidal), $SP^3d^2$(Octahedral), $SP^3d^3$ (Pentagonal bipyramid ).The strength of bonds formed by $S-S,P-P$ and $S-P$ overlap is in the order of

asked Apr 3, 2014 by meena.p

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