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Recent questions tagged physical-chemistry
Questions
Consider the following reaction:$ A + 3 B \rightarrow 2 C + 2 D$. At some point in the reaction $[B]=0.9986\; M$ and $13.20$ minutes later $[B]=0.9746\;M$. Based on this data, what is the average rate of the reaction during this time in $M/s$?
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
easy
asked
Dec 13, 2013
by
sreemathi.v
1
answer
A reaction was found to be second order with respect [ICl] and first order with respect to $[H_2]$ the overall order of reaction.
order-of-a-reaction
physical-chemistry
class12
ch4
general-characteristics
jeemain
chemistry
chemical-kinetics
easy
asked
Dec 13, 2013
by
sreemathi.v
1
answer
For a first order $Rx_n$ of rate constant K,$\;t_{ 2/3}$ the time of a reactant to drop to $1/3$) is given by:
order-of-a-reaction
first-order-reactions
physical-chemistry
class12
ch4
jeemain
chemistry
chemical-kinetics
easy
asked
Dec 13, 2013
by
sreemathi.v
1
answer
$t_{1/4}$ can be taken as the time taken for the concentration of a reactant to drop to $\large\frac{3}{4}$ of its initial value. If the rate constant for a first order reaction is K, the $t_{1/4}$ can be written as
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
jeemain
chemistry
chemical-kinetics
easy
asked
Dec 13, 2013
by
sreemathi.v
1
answer
In an experiment (reactant $\rightarrow$ product) we observe that if we increase the reactant to twice then time taken in the concentration of reaction to drop to $\large\frac{1}{2}$ of its value is reduced to $\large\frac{1}{4}$ then order is
jeemain
chemistry
chemical-kinetics
order-of-a-reaction
physical-chemistry
class12
ch4
general-characteristics
medium
asked
Dec 13, 2013
by
sreemathi.v
1
answer
A graph between $1/[A]^2$ vs t is plotted below where [A] is conc of [A] at time t and $[A_o]$ is initial conc and K is the rate constant of a $Rx^n$ $nA\rightarrow$ product. What is the half life for the $Rx^n(t_{\large\frac{1}{2}})$
order-of-a-reaction
physical-chemistry
class12
ch4
general-characteristics
medium
half-life
jeemain
chemistry
chemical-kinetics
asked
Dec 12, 2013
by
sreemathi.v
1
answer
A graph between $1/[A]^2$ vs t is plotted below where [A] is conc of [A] at time t and $[A_o]$ is initial conc and K is the rate constant of a $Rx^n$ $nA\rightarrow$ product. What is the initial concentration of [A]
jeemain
chemistry
chemical-kinetics
basics
physical-chemistry
class12
ch4
general-characteristics
medium
asked
Dec 12, 2013
by
sreemathi.v
1
answer
A graph between $1/[A]^2$ vs t is plotted below where [A] is conc of [A] at time t and $[A_o]$ is initial conc and K is the rate constant of a $Rx^n$ $nA\rightarrow$ product.What is the value of rate constant
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
medium
basics
asked
Dec 12, 2013
by
sreemathi.v
1
answer
A graph between $1/[A]^2$ vs t is plotted below where [A] is conc of [A] at time t and $[A_o]$ is initial conc and k is the rate constant of a $Rx^n$ $nA\rightarrow$ product. What is the order of the $Rx^n$
jeemain
chemistry
chemical-kinetics
order-of-a-reaction
physical-chemistry
class12
ch4
general-characteristics
medium
basics
asked
Dec 12, 2013
by
sreemathi.v
1
answer
For the reaction $aA+bB\rightarrow cC+dD$ the rate of formation of [C] in term of [A] is given by
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
easy
basics
asked
Dec 12, 2013
by
sreemathi.v
1
answer
Which of the following is the correct order of C-C bond length?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
hybridization
q6
difficult
asked
Dec 9, 2013
by
sreemathi.v
1
answer
VSEPR notation of $PCl_5, H_2O$ and $ICl_4^-$ are
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
vsepr(valence-shell-electron-pair-repulsion)theory
q5
difficult
asked
Dec 9, 2013
by
sreemathi.v
1
answer
Match Column I (Name of the compound ) with Column II (structure/geometry of the molecule) and select the correct answer.
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
vsepr(valence-shell-electron-pair-repulsion)theory
q4
difficult
asked
Dec 9, 2013
by
sreemathi.v
1
answer
Match Column I (Hybrid bond orbitals ) with Column II (species) and select the correct answer.
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
hybridization
q3
difficult
asked
Dec 9, 2013
by
sreemathi.v
1
answer
According to VSEPR theory, the number of lone pairs in $PCl_5, IF_5, SOF_4$, and $XeOF_4$
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
vsepr(valence-shell-electron-pair-repulsion)-theory
q2
difficult
asked
Dec 9, 2013
by
sreemathi.v
1
answer
Which are the species in which sulphur undergoes $sp^3$ hybridisation ?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
hybridization
q1
difficult
asked
Dec 9, 2013
by
sreemathi.v
1
answer
$ XeF_3^+$ belongs to which one of the following $AX_nE_m$ nomenclatures (A central atom, X singly bonded ligand and E an unshared electron pair) ?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
vsepr(valence-shell-electron-pair-repulsion)-theory
q31
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
The more reactivity of Phosphorouspentachloride $(PCl_5)$ is due to
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
valence-bond-theory
q30
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
Which of the pair is linear in shape and with three lone pairs?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
vsepr(valence-shell-electron-pair-repulsion)theory
q29
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
Where is an electron added during change of $NO^+$ to $NO$
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
valence-bond-theory
q28
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
Match the correct formula and shape of the central atom. Which pair is correct?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
vsepr(valence-shell-electron-pair-repulsion)theory
q27
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
The xenon compounds that are isostructural with $IBr_2-$ and $BrO_3-$ respectively are
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
vsepr(valence-shell-electron-pair-repulsion)theory
q26
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
The structure of $N(CH_3)_3$ and $N(SiH_3)_3$ are respectively
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
molecular-orbital-theory
q25
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
The paramagnetism of $O_2$ molecule is believed to be due to the presence of two electrons with parallel spin in
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
valence-bond-theory
q23
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
Which of the following statement is false?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
molecular-orbital-theory
q22
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
The structure of $IF_7$ is
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
hybridization
q21
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
The percentage of p -character in the orbital forming P-P bond in $P_4$ is
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
hybridization
q20
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
The structure of $XeO_3$ is
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
hybridization
q19
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
Stable compounds in +1 oxidation state are formed by
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
vsepr(valence-shell-electron-pair-repulsion)theory
q18
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
Which element has highest electronegativity ?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
vsepr(valence-shell-electron-pair-repulsion)theory
q17
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
Octahedral molecular shape exist in
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
hybridization
q16
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
Which of the following molecule is expected to exhibit the diamagnetic behavior?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
molecular-orbital-theory
q15
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
Among the following the maximum covalent character is shown by the compound
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
kossel-lewis-approach-to-chemical-bonding
q14
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
The correct sequence which shows the increasing basic strength is
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
valence-bond-theory
q13
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
Using MO theory predict which of the following species has the shortest bond length
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
molecular-orbital-theory
q12
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
Match the each of the diatomic molecule in column-I with the bond orders are given in the column -II
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
bond-parameters
q11
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
The bond energy (in kcal/mol) of C-C single bond is approximately
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
bond-parameters
q10
medium
asked
Dec 6, 2013
by
sreemathi.v
1
answer
Which of the following species has bond order different from that in CO?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
bond-parameters
q9
medium
asked
Dec 6, 2013
by
sreemathi.v
1
answer
Which of the following is a false statement?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
bond-parameters
q8
medium
asked
Dec 6, 2013
by
sreemathi.v
1
answer
Which of the following represent the correct order of increase in covalent character?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
kossel-lewis-approach-to-chemical-bonding
q7
medium
asked
Dec 6, 2013
by
sreemathi.v
1
answer
Which of the following represent the correct order of decrease in covalent character?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
kossel-lewis-approach-to-chemical-bonding
q6
medium
asked
Dec 6, 2013
by
sreemathi.v
1
answer
Which of the following represent the correct order of increase in covalent character?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
kossel-lewis-approach-to-chemical-bonding
q5
medium
asked
Dec 6, 2013
by
sreemathi.v
1
answer
Which of the following represent the correct order of decreasing lattice energy?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
ionic-or-electrovalent-bond
q4
medium
asked
Dec 6, 2013
by
sreemathi.v
1
answer
Which of the following compounds does not obey the octet rule?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
kossel-lewis-approach-to-chemical-bonding
q3
medium
asked
Dec 6, 2013
by
sreemathi.v
2
answers
Which of the following does not obey the octet rule?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
kossel-lewis-approach-to-chemical-bonding
q2
medium
asked
Dec 6, 2013
by
sreemathi.v
1
answer
Which of the following obeys the octet rule?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
kossel-lewis-approach-to-chemical-bonding
q1
medium
asked
Dec 6, 2013
by
sreemathi.v
1
answer
Which one of the following oxides is expected to exhibit paramagnetic behavior?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
molecular-orbital-theory
q15
easy
asked
Dec 6, 2013
by
sreemathi.v
1
answer
The bond order of $[He_2]^{4-}$ is
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
bond-parameters
q14
easy
asked
Dec 6, 2013
by
sreemathi.v
1
answer
In which case electron from bonding molecular orbital is removed?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
molecular-orbital-theory
q13
easy
asked
Dec 6, 2013
by
sreemathi.v
1
answer
$BrO_3^-$ is isostructural with a noble gas species
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
hybridization
q12
easy
asked
Dec 6, 2013
by
sreemathi.v
1
answer
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