Recent questions in Chemistry

From the following dipole moment ( in Debye) values of methyl halides, identify the value of $CH_3 - F$.

asked Oct 21, 2013 by thanvigandhi_1

1 answer

What are $\underline X $ and $\underline Y$ respectively in the following reaction ?

asked Oct 21, 2013 by meena.p

1 answer

What is the correct Fischer projection of (R) 2-hydroxy propanoic acid?

asked Oct 21, 2013 by thanvigandhi_1

1 answer

Identify A,B and C in the following reactions

asked Oct 21, 2013 by thanvigandhi_1

1 answer

The energy difference $( in\: Kcal\: mol^{-1})$ between the staggered and eclipsed conformations of ethane is

asked Oct 21, 2013 by thanvigandhi_1

1 answer

The stationary phase in paper chromatography is

asked Oct 21, 2013 by thanvigandhi_1

1 answer

According to Cahn- lngold- Prelog sequence rules, the correct order of priority for the given groups is :

asked Oct 21, 2013 by meena.p

1 answer

The pair of chemicals that maintain heat balance in troposphere are

asked Oct 21, 2013 by thanvigandhi_1

1 answer

Which of the following compound(s) has 'Z' configuration ?

asked Oct 21, 2013 by meena.p

1 answer

In the electrolysis of alumina using cryolite, the reaction that takes place at cathode is

asked Oct 21, 2013 by thanvigandhi_1

1 answer

Among the following compounds, which one is not responsible for depletion of layer?

asked Oct 21, 2013 by meena.p

1 answer

$[C0(NH_3)_5SO_4]Br$ and $[C_0(NH_3)_5Br]SO_4$ are a pair of __________ isomers.

asked Oct 21, 2013 by meena.p

1 answer

The compound in which the number of $d \pi -p\pi $ bonds are equal to those persent in $ClO_4^{-}$

asked Oct 21, 2013 by meena.p

1 answer

Which one of the following reactions does not occur?

asked Oct 21, 2013 by meena.p

1 answer

The number of sigma and pi bonds in peroxodisulphuric acid are , respectively

asked Oct 21, 2013 by meena.p

1 answer

The correct order of reducing abilities of hydrides of V group elements is

asked Oct 21, 2013 by meena.p

1 answer

Identify $\underline B$ in the following reaction :

asked Oct 21, 2013 by meena.p

1 answer

Boron halides behave as Lewis acids because of their ___________ nature.

asked Oct 21, 2013 by meena.p

1 answer

Which of the following statements are correct for alkali metal compounds ?

asked Oct 21, 2013 by meena.p

1 answer

Which one of the following reactions represents the oxidizing property of $H_2O_2$?

asked Oct 21, 2013 by meena.p

1 answer

Which one of the following graphs represents Freundlisch adsorption isotherm ?

asked Oct 21, 2013 by meena.p

1 answer

Calculate $\Delta H$ in kJ for the following reaction : $C_{(s)}+O_{2(g)} \longrightarrow CO_{2(g)}$ Given that , \[ H_2 O_{(g)} + C_{(s)} \longrightarrow CO_{(g)} + H_{2(g)} +H_{2(g)} \quad \Delta H =+131\;kJ\] \[CO_{(g)}+\large\frac{1}{2} O_{2(g)} \longrightarrow CO_{2(g)} \qquad \Delta H =-282\;kJ\] \[H_{2(g)}+\frac{1}{2} \;O_{2(g)} \longrightarrow H_2O_{(g)} \qquad \Delta H =-242\;kJ\]

asked Oct 21, 2013 by meena.p

1 answer

For a reversible reaction $A \rightleftharpoons B$, Which one of the following statement is wrong from the given energy profile diagram ?

asked Oct 21, 2013 by meena.p

1 answer

In a 500 ml flask, the degree of dissociation of $PCl_5$ at equilibrium is $40 \%$ and the initial amount is 5 moles. The value of equilibrium constant in $mol.lit^{-1}$ for the decomposition of $PCl_5$ is

asked Oct 21, 2013 by meena.p

1 answer

For a crystal, the angle of diffraction (20) is $90^{\circ}$ and the second order line has a $\underline d$ value of $2.28 A^{\circ}$.The wavelength (in $A ^{\circ}$) of $X-rays used for Bragg's diffraction is

asked Oct 21, 2013 by meena.p

1 answer

When electric current is passed through acidified water for $1930\;seconds,\;1120\;ml$ of $H_2$ gas is collected (at STP) at the cathode. What is the current passed in amperes?

asked Oct 21, 2013 by meena.p

1 answer

When same quantity of electricity is passed through aqueous $AgNO_3$ and $H_2SO_4$ solutions connected in series, $5.04 \times 10^{-2}\;g$ of $H_2$ is liberated. What is the mass of silver (in grams) deposited ? ( Eq wts ofHydrogen -1.008, silver =108)

asked Oct 21, 2013 by meena.p

1 answer

Which one of the following reactions is not correct?

asked Oct 21, 2013 by thanvigandhi_1

0 answers

Which one of the following reactions is not correct?

asked Oct 21, 2013 by thanvigandhi_1

0 answers

Assertion (A) : The aqueous solution of $CH_3 COONa$ is alkaline in nature. Reason (R) : Acetate ion undergoes anionic hydrolysis.

asked Oct 21, 2013 by meena.p

1 answer

$50\;ml$ of $H_2O$ is added to $50\;ml$ of $1 \times 10^{-3}\;M$ barium hydroxide solution. What is the pH of the resulting solution ?

asked Oct 21, 2013 by meena.p

1 answer

Match the following :

asked Oct 21, 2013 by meena.p

1 answer

In the reaction

asked Oct 21, 2013 by thanvigandhi_1

1 answer

When 25 grams of a non-volatile solute is dissolved in 100 grams of water, the vapour pressure is lowered by $2.25 \times 10^{-1}\;mm$ If the vapour pressure of water at $20^{\circ}$ is 17.5\;mm$ What is the molecular weight of the solute?

asked Oct 21, 2013 by meena.p

1 answer

What is the temperature at which the kinetic energy of 0.3 moles of Helium is equal to the kinetic energy of $0.4$ moles of Argon at 400 k?

asked Oct 21, 2013 by meena.p

1 answer

Which one of the following is a correct set?

asked Oct 21, 2013 by meena.p

0 answers

The bond length of HCl molecules is $1.275\;A^{\circ}$ and its dipole moment is $1.03\;D$. The ionic character of the molecule (in percent) (charge of the electron $=4.8 \times 10^{-10}\;e.s.u)$ is

asked Oct 21, 2013 by meena.p

1 answer

The atomic numbers of elements $\underline {A}, \underline {B}, \underline {C}$ and $\underline {D}$ are $z-1,z,z+=1$ and $z+2$ respectively. If '$\underline {B}$' is a noble gas, choose the correct answers from the following statements :

asked Oct 21, 2013 by meena.p

1 answer

If the mass defect of , $B^{11}$ is $0.081\;amu,$ its average binding energy (in Mev) is

asked Oct 21, 2013 by meena.p

1 answer

The velocities of two particles $\underline {A}$ and $\underline {B}$ are $00.05$ and $0.02\;ms^{-1}$ respectively. The mass of $\underline {B}$ is five times the mass of $\underline {A}$. The ratio of their de Broglie's wavelength is

asked Oct 21, 2013 by meena.p

1 answer

An electronic transition in hydrogen atom results, in the formation of $H_{\alpha}$ line of hydrogen in Lyman series, the energies associated with the electron in each of the orbits involved in the transition (in $kCal mol^{-1}$) are

asked Oct 21, 2013 by meena.p

1 answer

The number of lone pairs of electrons on $Xe\: in\: XeF_2, XeF_4\: and \: XeF_6$ are, respectively

asked Oct 20, 2013 by thanvigandhi_1

1 answer

Chlorine reacts with ammonia and gives nitrogen. The ratio of chlorine to ammonia in this reaction is

asked Oct 20, 2013 by thanvigandhi_1

1 answer

One per cent composition of an organic compound $\underline {A}$ is carbon: $85.71 \;\%$ and hydrogen $14.29\; \%$. It's vapour density is 14. Consider the following reaction sequence :

asked Oct 16, 2013 by meena.p

1 answer

What are $\underline{A},\underline {B}, \underline {C}$ in the following reactions ?

asked Oct 16, 2013 by meena.p

1 answer

Which one of the following is most effective in causing the coagulation of an $As_2S_3$ sol?

asked Oct 16, 2013 by meena.p

1 answer

Calculate $\Delta H^{\circ}$ for the reaction: $Na_2O+SO_3 \longrightarrow Na_2SO_4$ given the following :

asked Oct 16, 2013 by meena.p

1 answer

$20\; ml$ of $0.1\;M$ acetic acid is mixed with $50\;ml$ of Potassium acetate. $K_a$ of Acetic acid = $1.8 \times 10^{-5}$ at $27^{\circ}C$. The concentration of Potassium acetate if pH of the mixture is $4.8$:

asked Oct 16, 2013 by meena.p

1 answer

The concentration of an organic compound in chloroform is $6.15$g per $100\;mL$ of solution. A portion of this solution in a $5\;cm$ polarimeter tube causes an observed rotation of $-1.2^{\circ}.$ What is the specific rotation of the compound ?

asked Oct 16, 2013 by meena.p

1 answer

For the first order reaction at $27^{\circ}C, $ the radio of time required for $75 \%$ completion to $25 \%$ completion of reaction is :

asked Oct 16, 2013 by meena.p

1 answer

Ask Questions, Get Answers