Recent questions in Chemistry

The enolic form of acetone contains

asked Apr 4, 2014 by meena.p

1 answer

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

asked Apr 4, 2014 by meena.p

2 answers

Rate of a chemical reaction can be kept constant by

asked 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

asked Apr 4, 2014 by meena.p

1 answer

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

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

asked Apr 4, 2014 by meena.p

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The pressure exerted by 12g of an ideal gas at temperature $t^{\large\circ}C$ in a vessel of volume V litre is one atm. when the temperature is increased by 10 degree at the same volume , the pressure increases by $10\%$. Calculate the temperature t and volume V (molecular weight of the gas = 120 )

asked Apr 4, 2014 by sharmaaparna1

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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 :

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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

1 answer

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

asked 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

asked 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 $(\log 2 =0.301)$

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

1 answer