Recent questions tagged chemistry

Which reaction produces $SO_2$?

asked Oct 24, 2013 by thanvigandhi_1

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An oxide of nitrogen (X) is formed when Z is reacted with $P_2O_5$. X is soluble in water and gives Z. Which one of the following is Z?

asked Oct 24, 2013 by thanvigandhi_1

1 answer

Chlorophyll,a green coloring matter contains 2.68% mg.The number of atoms of mg present 1g chlorophyll are

asked Oct 24, 2013 by sreemathi.v

1 answer

The reaction that gives $CO_2$ as one of the product is

asked Oct 24, 2013 by thanvigandhi_1

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Which of the following statements are correct?

asked Oct 24, 2013 by thanvigandhi_1

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The reaction which does not liberate hydrogen is

asked Oct 24, 2013 by thanvigandhi_1

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Which one of the following reactions does not correspond to the preparation of "synthetic gasoline" during the Fischer-Tropsch process?

asked Oct 24, 2013 by thanvigandhi_1

1 answer

The equilibrium constant for the reaction $SO_2 (g)+\large\frac{1}{2}$$ O_2 (g) \rightleftharpoons SO_3(g)$ is $5 \times 10 ^{-2}\;atm$ The equilibrium consant of the reaction $250_3(g) \rightleftharpoons 2SO_2(g) +O_2 (g) $ would be

asked Oct 24, 2013 by meena.p

1 answer

Enthalpy of chemical absorption, $ \Delta\: H$ in $kJ\: mol^{-1}$ is in the range of

asked Oct 24, 2013 by thanvigandhi_1

1 answer

4.4g of $CO_2$ and $2.24$ litre of $H_2$ at STP are mixed in a container.The total number of molecules present in the container will be

asked Oct 24, 2013 by sreemathi.v

1 answer

For a reaction to be spontaneous at all temperatures

asked Oct 24, 2013 by thanvigandhi_1

1 answer

224 ml of triatomic gas weights 1g at 173k and 1atm .The mass of one atom of this gas is

asked Oct 24, 2013 by sreemathi.v

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Weight of oxygen in $Fe_2O_3$ and FeO in the simple ratio for the same amount of Fe is

asked Oct 24, 2013 by sreemathi.v

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Which of the following is not correct?

asked Oct 24, 2013 by meena.p

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Among the following, which is water insoluble ?

asked Oct 24, 2013 by meena.p

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Calorific value of producer gas is low because of

asked Oct 24, 2013 by meena.p

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Which of the following is not a peroxy acid?

asked Oct 24, 2013 by meena.p

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Bhopal gas tragedy of 1984 was caused by

asked Oct 24, 2013 by meena.p

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Two elements $X$ and $Y$ have atomic mass 75 and 16 respectively.They combine to give a compound having 75.8%X.The formula is

asked Oct 24, 2013 by sreemathi.v

1 answer

Aqueous solution of an organic compound. $'A'$ on electrolysis liberates acetylene and $CO_2$ at anode. $'A'$ is

asked Oct 24, 2013 by meena.p

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An organic compound 'X' on treatment with pyridinium chloro chromate in dichloromethane gives compound 'y'. Compound 'y', reacts with $l_2$ and alkali to form triiodomethane. The compound 'X' is

asked Oct 24, 2013 by meena.p

1 answer

Two oxides of a metal contain 50% and 40% of metal M respectively.If the formula of first oxide is MO,+ve formula of $2^{nd}$ oxide will be

asked Oct 24, 2013 by sreemathi.v

1 answer

An organic compound containing C and it has 92.3% carbon .Its empirical formula is :

asked Oct 24, 2013 by sreemathi.v

2 answers

A compound has an empirical formula $C_2H_4O$.An independent analysis gave a value of 132.16 for its molecular mass.What is the correct molecular formula ?

asked Oct 24, 2013 by sreemathi.v

1 answer

An organic compound contains 49.30% carbon,6.84% hydrogen and its vapour density is 73.Molecular formula of compound is

asked Oct 24, 2013 by sreemathi.v

1 answer

Nitro benzene on reduction with zinc and $NH_4 CL$ gives

asked Oct 24, 2013 by meena.p

1 answer

A compound on analysis,was found to have the following composition :(i) Na=14.31% (ii) S=9.97% (iii) O=69.50% (iv) H=6.22%.Calculate the molecular formula of the compound assuming that whole of hydrogen in the compound is present as water of crystallization .Molecular mass of the compound is 322.

asked Oct 24, 2013 by sreemathi.v

1 answer

Which of the following biomolecules acts as specific catalysts in biological reaction ?

asked Oct 24, 2013 by meena.p

1 answer

Calculate the emf of the cell $ Cu(s)|Cu^{2+} (aq)| |Ag^{+}(aq)| Ag(s) $ Given $E^{\circ}_{Cu^{2+}/Cu} =+0.34 \;V, E^{\circ}_{Ag^{+}/Ag}=0.80\;V$

asked Oct 24, 2013 by meena.p

1 answer

A certain mass of a gas occupies a volume of $2L$ at STP. To what temperature the gas must be heated to double its volume, keeping the pressure constant ?

asked Oct 24, 2013 by meena.p

1 answer

A carbon compound containing only carbon and oxygen has an approximate molecular mass of 290.On analysis,it is found to contain 50% by mass of each element .What is the molecular formula of the compound?

asked Oct 24, 2013 by sreemathi.v

1 answer

Which of the following is not tetrahedral ?

asked Oct 24, 2013 by meena.p

1 answer

The maximum number of sub-levels, orbitals and electrons in N shell of an atom are respectively

asked Oct 24, 2013 by meena.p

1 answer

A compound of carbon ,hydrogen and nitrogen contains these elements in the ratio 9 : 1 : 3.5.Calculate the empirical formula.If its molecular mass is 108,what is the molecular formula ?

asked Oct 24, 2013 by sreemathi.v

1 answer

A compound contains 34.8% Oxygen,52.2% Carbon and 13.0% hydrogen .What is the empirical formula mass of the compound ?

asked Oct 24, 2013 by sreemathi.v

1 answer

Calculate the empirical formula for a compound that contains 26.6% potassium,35.4% chromium and 38.1% oxygen.(Given :K=39.1,Cr=52,O=16)

asked Oct 24, 2013 by sreemathi.v

1 answer

Assertion (A): A catalyst increase the rate of a reaction. Reason (R): In presence of a catalyst, the activation energy of the reaction increases.

asked Oct 23, 2013 by meena.p

1 answer

Which of the following is an example of interstitial hydride?

asked Oct 23, 2013 by meena.p

1 answer

Which one of the following salts give an acidic solution in water?

asked Oct 23, 2013 by meena.p

1 answer

The following are some statement related to VA group hydrides,

asked Oct 23, 2013 by meena.p

1 answer

Which one of the following noble gases is used in miner's cap lamps ?

asked Oct 23, 2013 by meena.p

1 answer

The IUPAC name of the compound $(CH_3)_2 CH - CH = CH - CHOH -CH_3$ is

asked Oct 23, 2013 by meena.p

1 answer

Match the following:

asked Oct 23, 2013 by meena.p

1 answer

Hybridisation of oxygen in diethyl ether is

asked Oct 23, 2013 by meena.p

1 answer

\[CH_3 COOH \quad \underrightarrow {LiAlH_4} \quad A\] \[A +CH_3COOH \quad \underrightarrow {H_3O^{+}} \quad B+H_2O\] In the abive reactions 'A' and 'B' respectively are

asked Oct 23, 2013 by meena.p

1 answer

Which of the following is a biodegradable polymer?

asked Oct 23, 2013 by meena.p

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Which of the following statements is correct?

asked Oct 23, 2013 by meena.p

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138 g of ethyl alcohol is mixed with 72 g of water. The ratio of mole fraction of alcohol to water is

asked Oct 23, 2013 by meena.p

1 answer

The decreasing order of bond dissociation energies of C - C, C -H and H -H bound is

asked Oct 23, 2013 by meena.p

1 answer

The wavelength of a spectral line emitted by hydrogen atom in the Lyman series is $\large\frac{16}{15 R}$$cm$. What is the value of $n_2 ? $ (R=Rydberg constant)

asked Oct 23, 2013 by meena.p

1 answer

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