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Recent questions tagged chemistry

In salt bridge the electrolyte used should be

asked Dec 10, 2013 by sreemathi.v

1 answer

In the calomel half cell,the reduction $rx_n$ is

asked Dec 10, 2013 by sreemathi.v

1 answer

The correct representation of $\lambda^{\large\circ}CH_3COOH$ interms of $\lambda^{\large\circ}_{CH_3COOK},\lambda^{\large\circ}_KCl$ is

asked Dec 10, 2013 by sreemathi.v

1 answer

The dimensions of a conductance cell are 0.15dm & 0.95dm and the electrodes are separated by 0.05dm. What is cell constant for this cell?

asked Dec 10, 2013 by sreemathi.v

1 answer

What is the cell constant of a cell of an electrode having dimensions 4cm & 3cm and the two electrodes are separated by 2cm?

asked Dec 10, 2013 by sreemathi.v

1 answer

Calculate $\wedge^{\large\circ}_m$ for KCl solution if molar ionic conductances at infinite dilution are $7.352\times 10^{-3}Sm^2mol^{-1}$ for $K^+$ and $7.634\times 10^{-3}Sm^2mol^{-1}$ for $Cl^{-}$.The $\wedge^{\large\circ}_m$ is

asked Dec 10, 2013 by sreemathi.v

1 answer

Calculate the stability constant of the complex $[Zn(NH_3)_4]^{2+}$ formed in the $rx_n$:$Zn^{2+}+4NH_3\rightleftharpoons[Zn(NH_3)_4]^{2+}$. The stability constant 'K' is

asked Dec 10, 2013 by sreemathi.v

1 answer

Given the $rx_n, \;2Fe^{3+}(aq)+Sn^{2+}(aq)\rightarrow 2Fe^{2+}(aq)+Sn^{4+}(aq)$ what is the equ.constant of given $rx_n$

asked Dec 10, 2013 by sreemathi.v

1 answer

EMF of the cell $Sn,SnCl_2(0.5M)/AgCl,Ag$ is $0.430V$ at $25^{\large\circ}$C and $0.448$ at $0^{\large\circ}$C. The free energy change$(\Delta G)$, enthalpy change($\Delta H)$ and entropy change $(\Delta S)$ of the cell $rx_n$ at $25^{\large\circ}C$ are

asked Dec 10, 2013 by sreemathi.v

1 answer

Calculate the solubility product of $AgBr$ in water at $25^{\large\circ}$ from the cell: $Ag,Ag^+Br^-$(Saturated solution). The standard potentials are $E^{\large\circ}_{AgBr,Ag}=0.07V$, $E^{\large\circ}_{Ag^+,Ag}=0.80V$. The $K_{SP}$ Value is

asked Dec 10, 2013 by sreemathi.v

1 answer

Calculate the E.M.F of the electrode-concentration cell : $H_2(P_1),HCl,H_2(P_2)$ at $25^{\large\circ}C$ if $P_1$ = 1atm and $P_2 = 0.25\;atm$.The E.M.F. 'E' is

asked Dec 10, 2013 by sreemathi.v

1 answer

Which of the following is the correct order of C-C bond length?

asked Dec 9, 2013 by sreemathi.v

1 answer

VSEPR notation of $PCl_5, H_2O$ and $ICl_4^-$ are

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.

asked Dec 9, 2013 by sreemathi.v

1 answer

Match Column I (Hybrid bond orbitals ) with Column II (species) and select the correct answer.

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 $XeOF_4$

asked Dec 9, 2013 by sreemathi.v

1 answer

Which are the species in which sulphur undergoes $sp^3$ hybridisation ?

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) ?

asked Dec 9, 2013 by sreemathi.v

1 answer

The more reactivity of Phosphorouspentachloride $(PCl_5)$ is due to

asked Dec 9, 2013 by sreemathi.v

1 answer

Which of the pair is linear in shape and with three lone pairs?

asked Dec 9, 2013 by sreemathi.v

1 answer

Where is an electron added during change of $NO^+$ to $NO$

asked Dec 9, 2013 by sreemathi.v

1 answer

Match the correct formula and shape of the central atom. Which pair is correct?

asked Dec 9, 2013 by sreemathi.v

1 answer

The xenon compounds that are isostructural with $IBr_2-$ and $BrO_3-$ respectively are

asked Dec 9, 2013 by sreemathi.v

1 answer

The structure of $N(CH_3)_3$ and $N(SiH_3)_3$ are respectively

asked Dec 9, 2013 by sreemathi.v

1 answer

The correct order of bond angles of $CH_4, NH_3$ and $H_2O$ are

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

asked Dec 9, 2013 by sreemathi.v

1 answer

Which of the following statement is false?

asked Dec 9, 2013 by sreemathi.v

1 answer

The structure of $IF_7$ is

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

asked Dec 9, 2013 by sreemathi.v

1 answer

The structure of $XeO_3$ is

asked Dec 9, 2013 by sreemathi.v

1 answer

Stable compounds in +1 oxidation state are formed by

asked Dec 9, 2013 by sreemathi.v

1 answer

Which element has highest electronegativity ?

asked Dec 9, 2013 by sreemathi.v

1 answer

Octahedral molecular shape exist in

asked Dec 9, 2013 by sreemathi.v

1 answer

Which of the following molecule is expected to exhibit the diamagnetic behavior?

asked Dec 9, 2013 by sreemathi.v

1 answer

Among the following the maximum covalent character is shown by the compound

asked Dec 9, 2013 by sreemathi.v

1 answer

The correct sequence which shows the increasing basic strength is

asked Dec 9, 2013 by sreemathi.v

1 answer

Using MO theory predict which of the following species has the shortest bond length

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

asked Dec 9, 2013 by sreemathi.v

1 answer

The bond energy (in kcal/mol) of C-C single bond is approximately

asked Dec 6, 2013 by sreemathi.v

1 answer

Which of the following species has bond order different from that in CO?

asked Dec 6, 2013 by sreemathi.v

1 answer

Which of the following is a false statement?

asked Dec 6, 2013 by sreemathi.v

1 answer

Which of the following represent the correct order of increase in covalent character?

asked Dec 6, 2013 by sreemathi.v

1 answer

Which of the following represent the correct order of decrease in covalent character?

asked Dec 6, 2013 by sreemathi.v

1 answer

Which of the following represent the correct order of increase in covalent character?

asked Dec 6, 2013 by sreemathi.v

1 answer

Which of the following represent the correct order of decreasing lattice energy?

asked Dec 6, 2013 by sreemathi.v

1 answer

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

asked Dec 6, 2013 by sreemathi.v

2 answers

Which of the following does not obey the octet rule?

asked Dec 6, 2013 by sreemathi.v

1 answer

Which of the following obeys the octet rule?

asked Dec 6, 2013 by sreemathi.v

1 answer

Which one of the following oxides is expected to exhibit paramagnetic behavior?

asked Dec 6, 2013 by sreemathi.v

1 answer

The bond order of $[He_2]^{4-}$ is

asked Dec 6, 2013 by sreemathi.v

1 answer

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