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Recent questions in Chemistry

Questions >> JEEMAIN and NEET >> Chemistry

Chemistry

Which of the following is not true about Phosphine?

asked Jul 14, 2014 by balaji.thirumalai

1 answer

White phosphorus on reaction with $\text{NaOH}$ gives $\text{PH}_3$ as one of the products. What type of a reaction is this?

asked Jul 14, 2014 by balaji.thirumalai

1 answer

Between $\text{NH}_3$ and $\text{PH}_3$, which is a better electron donor and why?

asked Jul 14, 2014 by balaji.thirumalai

1 answer

Choose the correct statement:

asked Jul 14, 2014 by balaji.thirumalai

1 answer

Given the following Assertion and Reason, choose the correct answer:

asked Jul 14, 2014 by balaji.thirumalai

1 answer

Which are the following statements are correct about White Phosphorus ($\text{P}_4$)?

asked Jul 14, 2014 by balaji.thirumalai

1 answer

Why is it that in the case of nitrogen $\text{NCl}_3$ is possible, but not $\text{NCl}_5$, while in the case of phosphorus, $\text{PCl}_3$ and $\text{PCl}_5$ are possible.

asked Jul 14, 2014 by balaji.thirumalai

1 answer

Arrange the following compounds in order of reactivity towards $SN^1$ displacement.\[\] 1) 2 –Bromo-2-methylbutane \[\] 2) 1–Bromopentane \[\] 3) 2–Bromopentane

asked Apr 9, 2014 by thanvigandhi_1

1 answer

For the reaction : $R - Br \rightarrow R - O - N=O$ the suitable reagent is

asked Apr 9, 2014 by thanvigandhi_1

1 answer

Alkyl halide reacts with an alcoholic solution of ammonia to give a mixture of :

asked Apr 9, 2014 by thanvigandhi_1

1 answer

In $CH_3 − CH_2 − CH_2 − Br$, $C-Br$ bond is formed by the overlapping of

asked Apr 9, 2014 by thanvigandhi_1

1 answer

In the chlorination of isobutane, which product will be formed in excess

asked Apr 9, 2014 by thanvigandhi_1

1 answer

$CH_3Br\quad\underrightarrow{KCN}\quad A \quad\underrightarrow{+ 4H}\quad CH_3CH_2NH_2$ $ IUPAC$ name of $A$ is

asked Apr 9, 2014 by thanvigandhi_1

1 answer

Reduction of alkyl halide with nascent hydrogen leads to the formation of

asked Apr 9, 2014 by thanvigandhi_1

3 answers

Sec butyl chloride will undergo alkaline hydrolysis in the polar solvent by

asked Apr 9, 2014 by thanvigandhi_1

1 answer

The following method can not be considered suitable for the lab preparation of alkyl halide:

asked Apr 9, 2014 by thanvigandhi_1

1 answer

A metal crystallises into two cubic phases , face-centered cubic (fcc) and body centered (bcc) whose unit lengths are $3.5 \;and\;3.0 A^{\large\circ}$ respectively . Calculate the ratio of densities of fcc and bcc.

asked Apr 9, 2014 by sharmaaparna1

1 answer

Cu metal crystallises in face centered cubic lattice with cell edge , a = 361.6 pm . What is the density of Cu crystal ? (Atomic mass of copper = 63.5 amu , $N_A = 6.023\times10^{23}$

asked Apr 9, 2014 by sharmaaparna1

1 answer

The density of crystalline sodium chloride is $2.165g cm^{-3}$ . What is the edge length of the unit cell.

asked Apr 9, 2014 by sharmaaparna1

1 answer

Silver crystallises in a face centered cubic unit cell . The density of Ag is $10.5 g cm^{-3}$. Calculate the edge length of the unit cell .

asked Apr 8, 2014 by sharmaaparna1

1 answer

What is the pressure of HCl gas at $-40^{\large\circ}C$ if its density is $8.0 kgm^{-3}? (R = 8.314 JK^{-1}mol^{-1})$

asked Apr 8, 2014 by sharmaaparna1

1 answer

A sample of gas occupies a volume of 512 mL at $20^{\large\circ}C$ and 74 cm of Hg as pressure . What volume would this gas occupy at STP?

asked Apr 8, 2014 by sharmaaparna1

1 answer

Helium and Argon are monoatomic gases and their atomic weights are 4 and 40 respectively . Under identical conditions, helium will diffuse through a semipermeable membrane

asked Apr 8, 2014 by sharmaaparna1

1 answer

2g of hydrogen diffuses from a container in 10 minutes . How many grams of oxygen would diffuse through the same container in the same time under similiar conditions ?

asked Apr 8, 2014 by sharmaaparna1

1 answer

The time taken for a certain volume of a gas X to diffuse through a small hole is 2 minutes . It takes 5.65 minutes for oxygen to diffuse under the similiar conditions . The molecular weight of X is

asked Apr 8, 2014 by sharmaaparna1

1 answer

If same moles of $O_2$ diffuse in 18 sec and same mole of other gas diffuse in 45 sec then what is the molecular weight of the unknown gas?

asked Apr 8, 2014 by sharmaaparna1

1 answer

pi bond is formed,

asked Apr 7, 2014 by meena.p

1 answer

The type of bonds present in $CuSO_4.5H_2O$ are only

asked Apr 7, 2014 by meena.p

1 answer

An atom of one element A has four electrons in its outermost shell, and that of B has six electrons in the outermost shell. The formula of the compound formed by these two will be

asked Apr 7, 2014 by meena.p

1 answer

Among $CaH_2,NH_3,NaH$ and $B_2 H_6$ which are covalent hydride ?

asked Apr 7, 2014 by meena.p

1 answer

The density of a pure substance 'A' whose atoms pack in cubic close pack arrangement is 1g m/cc . If B atoms can occupy tetrahedral voids and all the tetrahedral voids are occupied by 'B' atoms what is the density of resulting solid in gm/cc . [Atomic mass (A) = 30 gm/mol and atomic mass (B) = 50gm/mol]

asked Apr 7, 2014 by sharmaaparna1

1 answer

The root mean square of a gas at 300K is $3\sqrt{R}$. The molar mass of this gas in $Kg mol^{-1}$ is

asked Apr 7, 2014 by sharmaaparna1

1 answer

The $U_{rms}$ of $SO_2 \;at\;27^{\large\circ}C$

asked Apr 7, 2014 by sharmaaparna1

1 answer

The average kinetic energy of 1.6 g $CH_4$ molecules at $27^{\large\circ}C$ is:

asked Apr 7, 2014 by sharmaaparna1

1 answer

The intermolecular forces vanishes among water molecules , then volume occupied by 1.8 g $H_2O(l)$ at STP is

asked Apr 7, 2014 by sharmaaparna1

1 answer

The intercept of plots of log V vs log T curves at constant pressure P for 1 mole gas will be

asked Apr 7, 2014 by sharmaaparna1

1 answer

For one mole of an ideal gas $(\large\frac{\delta P}{\delta T})_V.(\large\frac{\delta V}{\delta T})_P . (\large\frac{\delta V}{\delta T})_T $ is equal to ....

asked Apr 7, 2014 by sharmaaparna1

1 answer

The kinetic molecular theory attributes an average translational kinetic energy of $\large\frac{3}{2}\large\frac{RT}{N}$ to each particle. What rms speed woul a mist particle of mass $10^{-12}g$ have a root temperature $(27^{\large\circ}C)$ according to kinetic theory of gases.

asked Apr 7, 2014 by sharmaaparna1

1 answer

The composition of the equilibrium mixture $(Cl_2\iff2Cl)$ which is attained at $1200^{\large\circ}C$ is determined by measuring the rate of effusion through a pinhole . It is observed that at 1.80 mm Hg pressure , the mixture effuses 1.16 times as fast as krypton effuses under the same conditions. Calculate the fraction of chlorine molecules dissociated anto atoms.(Atomic wt of Kr = 84)

asked Apr 5, 2014 by sharmaaparna1

1 answer

Pure $O_2$ diffuses through an aperture in 224 seconds whereas mixture of $O_2$ and another gas containing $80\%\;O_2$ diffuses from the same in 234 sec. What is mol. wt. of gas?

asked Apr 5, 2014 by sharmaaparna1

1 answer

The average speed at $T_1K$ and the most probable speed at $T_2K of $CO_2$ gas is $9\times10^4cm/s. Calculate the value of $T_1 and T_2$

asked Apr 5, 2014 by sharmaaparna1

1 answer

The density of a mixture of $O_2$ and $N_2$ at NTP is 1.3g/l . Calculate partial pressure of $O_2$ .

asked Apr 5, 2014 by sharmaaparna1

1 answer

Which of the following correctly denotes the catalyst and promoter used in Haber's process for manufacture of ammonia, respectively?

asked Apr 4, 2014 by mosymeow_1

1 answer

Which of the following properties are of lyophilic colloids?

asked Apr 4, 2014 by mosymeow_1

1 answer

Micelles are what type of colloids?

asked Apr 4, 2014 by mosymeow_1

1 answer

Which type of colloids mentioned below has both lyophilic and lyophobic groups of molecules?

asked Apr 4, 2014 by mosymeow_1

2 answers

Which of the following are not the properties of colloidal solution?

asked Apr 4, 2014 by mosymeow_1

1 answer

Among the following which has the most polar character.

asked Apr 4, 2014 by meena.p

1 answer

A section of the periodic table is given below elements A , B and X, Y in two groups. Which of the bonds given below is the least polar.

asked Apr 4, 2014 by meena.p

1 answer

p- bonding occurs in each of the following except

asked Apr 4, 2014 by meena.p

1 answer

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