Recent questions tagged 2006

Given the data at $25^{\circ}C$, $Ag + I^- \to AgI + e^- ;\; \; \; E^{\circ} = 0.152 \;V$ $\;\;\;\;\;\;Ag \to Ag^+ + e^-; \; \; \; E^{\circ} = -0.800 \; V$ What is the value of $\log K_{sp}$ for $AgI$ ? $(2.303 \frac{RT}{F} = 0.059\;V)$

asked Nov 13, 2018 by pady_1

0 answers

Following statements regardinng the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture ?

asked Nov 13, 2018 by pady_1

0 answers

The equilibrium constant for the reaction $SO_3 (g) \rightleftharpoons SO_2(g) + \frac{1}{2} O_2 (g)$ is $K_c = 4.9 \times 10^{-2}$. The value of $K_c$ for the reaction $2SO_2 (g) + O_2(g) \leftrightharpoons 2SO_3 (g)$ will be :

asked Nov 13, 2018 by pady_1

0 answers

The 'spin-only' magnetic moment [ in units of Bohr magneton, ($\mu_{\beta}$) ] of $Ni^{2+}$ in aqueous solution would be (Atomic number of Ni = 28) :

asked Nov 13, 2018 by pady_1

0 answers

The alkene formed as a major product in the above elimination reaction is :

asked Nov 13, 2018 by pady_1

0 answers

The decreasing values of bond angles from $NH_3 (107^{\circ})$ to $SbH_3 (91^{\circ})$ down group 15 of the periodic table is due to :

asked Nov 13, 2018 by pady_1

0 answers

The structure of the compound that gives a tribromo derivative on treatment with bromine water is :

asked Nov 13, 2018 by pady_1

0 answers

Increasing order of stability among the three main conformations (i.e., Eclipse, Anti, Gauche) of 2-fluoroethanol is :

asked Nov 13, 2018 by pady_1

1 answer

Reaction of trans-2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces :

asked Nov 13, 2018 by pady_1

0 answers

The structure of the major product formed in the following reaction is :

asked Nov 13, 2018 by pady_1

0 answers

Rate of a reaction can be expressed by Arrhenius equation as : $k = Ae^{-E/RT}$ In this equation, $E$ represents :

asked Nov 13, 2018 by pady_1

0 answers

In Langmuir's model of adsorption of a gas on a solid surface :

asked Nov 13, 2018 by pady_1

0 answers

An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If $T_i$ is the initial temperature and $T_f$ is the final temperature, which of the following statements is correct ?

asked Nov 13, 2018 by pady_1

0 answers

The increasing order of the first ionization enthalpies of the elements $B, \; P\; S$ and $F$ (lowest first) is :

asked Nov 13, 2018 by pady_1

0 answers

In $Fe(CO)s$, the $Fe-C$ bond possesses :

asked Nov 13, 2018 by pady_1

0 answers

Nickel ( Z = 28 ) combines with a uninegative monodentate ligand $X^-$ to form a paramagnetic complex $[NiX_4]^{2-}$. The number of unpaired electron(s) in the nickel and geometry of this complex ion are respectively :

asked Nov 13, 2018 by pady_1

0 answers

What products are expected from the disproportion reaction of hypochlorous acid ?

asked Nov 13, 2018 by pady_1

0 answers

In which of the following molecules / ions all the bonds are not equal ?

asked Nov 13, 2018 by pady_1

0 answers

The correct order of increasing acid strength of the compounds : (A) $CH_2CO_2H$ (B) $MeOCH_2CO_2H$ (C) $CF_3CO_2H$ (D) is :

asked Nov 13, 2018 by pady_1

0 answers

Which one of the following sets of ions represents a collection of isoelectronic species ?

asked Nov 13, 2018 by pady_1

0 answers

The molar conductivities $\bigwedge^{\circ} NaOAc$ and $ \bigwedge^{\circ} HCl$ at infinite dilution in water at $25^{\circ}C$ are $91.0$ and $426.2\; S\; cm^2/mol$ respectively. To calculate $ \bigwedge^{\circ} HOAc$, the additional value required is :

asked Nov 13, 2018 by pady_1

0 answers

Which of the following statement is true ?

asked Nov 13, 2018 by pady_1

0 answers

A metal, M forms chlorides in its $+2$ and $+4$ oxidation states. Which of the following statements about these chlorides is correct ?

asked Nov 13, 2018 by pady_1

1 answer

Fluorobenzene $(C_6H_5F)$ can be synthesized in the laboratory :

asked Nov 13, 2018 by pady_1

0 answers

Among the following mixtures, dipole - dipole as the major interaction, is present in :

asked Nov 13, 2018 by pady_1

0 answers

The standard enthalpy of formation $(\Delta H_f^{\circ})$ at 298 K for methane, $CH_4 (g)$, is $-74.8 \; kJ\;mol^{-1}$. The additional information required to determine the average energy for $C-H$ bond formation would be :

asked Nov 13, 2018 by pady_1

0 answers

Phosphorus pentacloride dissociates as follows, in a closed reaction vessel, $PCl_5 (g) \rightleftharpoons PCl_3 (g) + Cl_2(g) $ If total pressure at equilibrium of the reaction mixture is $P$ and degree of dissociation of $PCl_5$ is $x$, the partial pressure of $PCl_3$ will be :

asked Nov 13, 2018 by pady_1

0 answers

Uncertainty in the position of an electron (mass $9.1 \times 10^{-31} kg$) moving with a velocity $300\; ms^{-1}$, accurate upon $0.001 \%$ will be : ($ h = 6.63 \times 10^{-34} Js$)

asked Nov 13, 2018 by pady_1

1 answer

The increasing order of stability of the following free radicals is :

asked Nov 13, 2018 by pady_1

0 answers

Among the following the one that gives positive iodoform test upon reaction with $I_2$ and $NaOH$ is :

asked Nov 13, 2018 by pady_1

0 answers

The pyrimidine bases present in DNA are :

asked Nov 13, 2018 by pady_1

0 answers

$CH_3Br + Nu^- \to CH_3 - Nu + Br^-$ The decreasing order of the rate of the above reaction with nucleophiles $(Nu^-)$ A to D is : [$Nu^- = (A)\; PhO,\; (B)\; AcO^-,\; (C)\; HO^-\; (D)\; CH_3O$]

asked Nov 13, 2018 by pady_1

0 answers

Phenyl magnesium bromide reacts with methanol to give :

asked Nov 13, 2018 by pady_1

0 answers

In the transformation of $_{92}^{238}U$ to $_{92}^{234}U$, if one emission is an $\alpha$-particle, what should be the other emission (s) ?

asked Nov 13, 2018 by pady_1

0 answers

The term anomers of glucose refers to :

asked Nov 13, 2018 by pady_1

0 answers

The IUPAC name for the complex $[Co(NO_2)(NH_3)_5]Cl_2$ is :

asked Nov 13, 2018 by pady_1

0 answers

Which of the following chemical reactions depicts the oxidizing behaviour of $H_2SO_4$ ?

asked Nov 13, 2018 by pady_1

0 answers

A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with everything else kept the same, the rate of reaction will :

asked Nov 13, 2018 by pady_1

0 answers

Total volume of atoms present in a face-centred cubic unit cell of a metal is (r is atomic radius) :

asked Nov 13, 2018 by pady_1

0 answers

Which of the following molecules/ions does not contain unpaired electrons ?

asked Nov 13, 2018 by pady_1

0 answers

According to Bohr's theory, the angular momentum of an electron in 5th orbit is :

asked Nov 13, 2018 by pady_1

0 answers

How many moles of magnesium phosphate, $Mg_3 (PO_4)_2$ will contain 0.25 mole of oxygen atoms ?

asked Nov 13, 2018 by pady_1

0 answers

The increaing order of the rate of HCN addition to compound A-D is : (A) $HCHO$ (B) $CH_3COCH_3$ (C) $PhCOCH_3$ (D) $PhCOPh$

asked Nov 13, 2018 by pady_1

0 answers

The IUPAC name of the compound shown below is :

asked Nov 13, 2018 by pady_1

0 answers

$HBr$ reacts with $CH_2 = CH - OCH_3$ under anhydrous conditions at room temperature to give :

asked Nov 13, 2018 by pady_1

0 answers

If the terminal speed of a sphere of gold (density = $19.5 \; kg/m^3$) is $0.2 \; m/s$ in a viscous liquid (density = $1.5\; kg/m^3$), find the terminal speed of a sphere of silver (density = $10.5 \; kg/m^3$) of the same size in the same liquid.

asked Nov 13, 2018 by pady_1

0 answers

The rms value of the electric field of the light coming from the Sun is 720 N/C. The average total energy density of the electromagnetic wave is :

asked Nov 13, 2018 by pady_1

0 answers

If the lattice constant of this semiconductor is decreased, then which of the following is correct ?

asked Nov 13, 2018 by pady_1

0 answers

The work of 146 kJ is performed in order of compress one kilo mole of a gas adiabatically and in this process the temperature of the gas increases by $7^{\circ}C$. The gas is : ($R = 8.3 \; J\; mol^{-1} K^{-1}$)

asked Nov 13, 2018 by pady_1

0 answers

Two rigid boxes containing different ideal gases are placed on a table. Box A contains one mole of nitrogen at temperature $T_0$, while box B contains one mole of helium at temperature $(7/3) T_0$. The boxes are then put into thermal contact with each other, and heat flows between them until the gases reach a common final temperature (Ignore the heat capacity of boxes). Then, the final temperature of the gases, $T_f$ in terms of $T_0$ is :

asked Nov 13, 2018 by pady_1

0 answers

Ask Questions, Get Answers