Recent questions in Chemistry

How many electrons are present in 1.6g of methane?

asked Oct 23, 2013 by sreemathi.v

1 answer

How many molecules of atoms of oxygen are present in 5.6 litres of oxygen $(O_2)$ at NTP?

asked Oct 23, 2013 by sreemathi.v

1 answer

From 200mg of $CO_2,10^{21}$ molecules are removed.How many moles of $CO_2$ are left?

asked Oct 22, 2013 by sreemathi.v

1 answer

What is the mass of $3.01\times 10^{22}$ molecules of ammonia?

asked Oct 22, 2013 by sreemathi.v

1 answer

How many molecules of water and oxygen atoms are present in 0.9g of water?

asked Oct 22, 2013 by sreemathi.v

1 answer

Insulin contains 3.4% sulphur.Then the minimum molecular mass of the insulin is about

asked Oct 22, 2013 by sreemathi.v

2 answers

A gas has a vapour density 11.2. The volume occupied by 1g of the gas at NTP is

asked Oct 22, 2013 by sreemathi.v

1 answer

116 mg of a compound on vaporization in Victor mayer's apparatus displaces 44.8 ml of air measured at STP.The molecular mass of the compound is

asked Oct 22, 2013 by sreemathi.v

1 answer

Which has the maximum number of atom

asked Oct 22, 2013 by sreemathi.v

1 answer

Which of the following two oxide of nitrogen have 30.5% nitrogen

asked Oct 22, 2013 by sreemathi.v

1 answer

Which of the following alkanes has 75% of carbon?

asked Oct 22, 2013 by sreemathi.v

1 answer

Which pair of species has same percentage of carbon?

asked Oct 22, 2013 by sreemathi.v

1 answer

It is found that 16.5g of metal combine with oxygen to form 35.6g of metal oxide.Calculate the percentage of metal and oxygen in the compound.

asked Oct 22, 2013 by sreemathi.v

1 answer

An unknown element forms an oxide.What will be the equivalent mass of the element if the oxygen content is 20% by mass ?

asked Oct 22, 2013 by sreemathi.v

1 answer

A piece of copper weighs $0.635g.$How many atoms of copper does it contain?

asked Oct 22, 2013 by sreemathi.v

1 answer

$25g$ of $MCl_4$ contains $0.5\;mol$ chlorine then its molecular mass is

asked Oct 22, 2013 by sreemathi.v

1 answer

The maximum number of molecules present in :

asked Oct 22, 2013 by sreemathi.v

1 answer

3g of hydrocarbon on combustion with 11.2g of oxygen produce 8.8g of $CO_2$ and 5.4g of $H_2O$.The data illustrates the law of

asked Oct 22, 2013 by sreemathi.v

1 answer

Electrons with a kinetic energy of $6.023 \times 10^4 \;j/mol$ are evolved from a surface of a metal , when it is exposed to radiation of wavelength of $600\;nm$. The minimum amount of energy required to removed an electron from the metal atom is:

asked Oct 14, 2013 by meena.p

1 answer

Which one of the following sets correctly represent the increase in the paramagnetic property of the ions?

asked Oct 14, 2013 by meena.p

1 answer

The wave lengths of electron waves in two orbits is $3:5$ The ratio of kinetic energy of electrons will be :

asked Oct 14, 2013 by meena.p

1 answer

The number of $p \pi-d \pi $ 'pi' bonds present in $XeO_3$ and $XeO_4$ molecules, respectively:

asked Oct 14, 2013 by meena.p

1 answer

One mole of alkene $\underline {X}$ on ozonolysis gave one mole of acetaldehyde and one mole of acetone. The IUPAC name of $\underline{X}$ is :

asked Oct 14, 2013 by meena.p

1 answer

Refer to the below image :

asked Sep 5, 2013 by sreemathi.v

1 answer

Refer to the below equation :

asked Sep 5, 2013 by sreemathi.v

1 answer

Choose the correct comparison of reactivity of molecules in E2 elimination reaction

asked Sep 5, 2013 by sreemathi.v

1 answer

Look at the following reaction and select the correct statement

asked Sep 5, 2013 by sreemathi.v

1 answer

Mark out the correct comparison of the rates of solvolysis reaction

asked Sep 4, 2013 by sreemathi.v

1 answer

Refer to the below equation :

asked Sep 4, 2013 by sreemathi.v

1 answer

Choose the correct answer

asked Sep 4, 2013 by sreemathi.v

1 answer

Predict the product

asked Sep 4, 2013 by sreemathi.v

1 answer

n-propyl bromide would give SN2 reaction under which of the following condition?

asked Sep 4, 2013 by sreemathi.v

1 answer

In which of the following reaction product formation by Hoffman’s rule?

asked Sep 4, 2013 by sreemathi.v

1 answer

Which of the following is best choice of reagents for the electrophilic iodination of an aromatic ring?

asked Sep 4, 2013 by sreemathi.v

1 answer

An acetolysis of reaction takes place as follows

asked Sep 4, 2013 by sreemathi.v

1 answer

The most probable product in the following reaction will be

asked Sep 4, 2013 by sreemathi.v

1 answer

Refer to the below equation :

asked Sep 3, 2013 by sreemathi.v

1 answer

The most probable product in the following reaction is

asked Sep 3, 2013 by sreemathi.v

1 answer

An SN2 reaction in an asymmetric carbon of a compound always give

asked Sep 3, 2013 by sreemathi.v

1 answer

Arrange the following nucleophiles in the order of the nucleophilicity in protic solvents $SH^-,OAC^-,PHO^-,OH^-,H_2O$

asked Sep 3, 2013 by sreemathi.v

1 answer

Arrange the following in decreasing order of $SN_1$ reactivity

asked Sep 3, 2013 by sreemathi.v

1 answer

Refer to the below equation :

asked Sep 3, 2013 by sreemathi.v

1 answer

Which of the following statements correctly describes E1 reaction of alkyl halide?

asked Sep 3, 2013 by sreemathi.v

1 answer

Which of the following compounds undergoes solvolysis in aquoes ethanol most rapidly?

asked Aug 26, 2013 by sreemathi.v

1 answer

What is the product of the following reaction :

asked Aug 26, 2013 by sreemathi.v

1 answer

Refer to the below equation :

asked Aug 26, 2013 by sreemathi.v

1 answer

When O-Flurotoluene is treated with sodium amide the product is

asked Aug 26, 2013 by sreemathi.v

1 answer

Refer to the below image :

asked Aug 26, 2013 by sreemathi.v

1 answer

Trace the major product of the following reaction

asked Aug 26, 2013 by sreemathi.v

1 answer

Refer to the image below :

asked Aug 23, 2013 by sreemathi.v

1 answer

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