Recent questions in Chemistry

What causes Brownian movement in a colloidal solution ?

asked Nov 8, 2016 by meena.p

1 answer

Answer the following questions : (i) Why do soaps not work in hard water. (ii) What are the main constituents of dettol (iii) How do antiseptic differ from disinfectants

asked Nov 8, 2016 by meena.p

1 answer

How do you explain the presence of an aldehydic group in a glucose molecule ?

asked Nov 7, 2016 by meena.p

1 answer

Show how will you synthesize : (i) 1- phenylethanol from a suitable alkene (ii) cyclohexyl methanol using an alkyl halide by an $SN^2$ reaction . (iii) Pentan-1-ol using a suitable alkyl halide ?

asked Nov 7, 2016 by meena.p

1 answer

p- Dichlorobenzene has higher melting point and lower solubility than o- and m- isomers Discuss.

asked Nov 7, 2016 by meena.p

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A solution of $KMnO_4$ on reducing yields either a colourless solution or a brown precipitate or a green solution depending on $PH$ of the solution . What different stages of the reduction do these represent and how are they carried out ?

asked Nov 7, 2016 by meena.p

1 answer

Why are pentahalides more covalent than trihalides ?

asked Nov 7, 2016 by meena.p

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Why is it advantageous to roast a sulphide ore to the oxide before reduction ?

asked Nov 7, 2016 by meena.p

1 answer

How do size of particles of absorbent , pressure of gas and prevailing temperature enfluence the extent of absorption of a gas on a solid ?

asked Nov 7, 2016 by meena.p

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Differenciate between rate of reaction and reaction rate constant

asked Nov 4, 2016 by meena.p

1 answer

Depict the galvanic cell in which the reaction $2Zn(s) +2 Ag^{+}(aq) \to Zn ^{2+}(aq) +2 Ag(s) $ takes place . Further show: (i) Which of the electrode is negatively charged? (ii) The carriers of the current in the cell. (iii) Individual reaction at each electrode.

asked Nov 4, 2016 by meena.p

1 answer

Why is boiling point of water increased on addition of sodium chloride into it ?

asked Nov 4, 2016 by meena.p

1 answer

Explain why does conductivity of germanium crystals increase on doping with gallium

asked Nov 4, 2016 by meena.p

1 answer

How do you explain the functionality of monomer?

asked Nov 4, 2016 by meena.p

1 answer

Explain giving a reason for each of the following situation : (i) In aqueous medium, HCl is stronger acid than HF (ii) White phosphorus is more reactive than red phosphorous.

asked Nov 4, 2016 by meena.p

1 answer

Calculate the equilibrium constant $K_c$ for the reaction . $3Sn^{4+} +2Cr \to 3Sn^{2+}+2Cr^{3+}$Given $E^0 =0.885\;V$

asked Nov 4, 2016 by meena.p

1 answer

When $1 \;mol$ of $NaCl$ is added to 1 litre of water , the boiling point of water increases on other hand, addition of 1mol of methyl alcohol to one litre of water decreases the boiling point of water . Explain why does this happen .

asked Nov 4, 2016 by meena.p

1 answer

Copper crystallizer into an fcc lattice with edge length $3.61 \times 10^{-8}\;cm$ Show that the calculated density is in agreement with its measured value of $8.92 \;g\;cm^{-3}$

asked Nov 4, 2016 by meena.p

1 answer

Where are receptors located ?

asked Nov 4, 2016 by meena.p

1 answer

Write the structure of 4 - methyl pent -3-en -2- one

asked Nov 4, 2016 by meena.p

1 answer

How do you account for the miscibility of ethoxyethane with water.

asked Nov 4, 2016 by meena.p

1 answer

Which compound is used to estimate the hardness of water volumetrically?

asked Nov 4, 2016 by meena.p

2 answers

Why is ferric chloride preffered over potassium in case of a cut leading to bleeding ?

asked Nov 4, 2016 by meena.p

1 answer

Low density polythene and high density polythene , both are polymers of ethene but there is marked difference in their properties . Explain

asked Nov 4, 2016 by meena.p

1 answer

How do antiseptics differ from disinfectant? Give one example of each case

asked Nov 4, 2016 by meena.p

1 answer

Differentiate between chiral and achiral molecules :

asked Nov 3, 2016 by meena.p

1 answer

$CuSO_4.5H_2O$ is blue in colour while $CuSO_4$ is colourless . why ?

asked Nov 3, 2016 by meena.p

1 answer

Why do the d-block elements exhibits a large number of oxidation states than f - block elements

asked Nov 3, 2016 by meena.p

1 answer

When Cons $H_2SO_4$ was added into an unknown salt present in a test tube, a brown gas (A) was evolved . This gas intensified when copper turnings were also added into this test tube . On cooling , the gas (A) changed into a colourless gas (B) (a) identify the gases A and B.

asked Nov 3, 2016 by meena.p

1 answer

With the help of an example how one can separate two sulphide ores by froth flotation method .

asked Nov 3, 2016 by meena.p

1 answer

Explain what is observed when (a) an electric current is passed through a solution . (b) a beam of light is passed through a solution (c) an electrolyte (say NaCl) is added to ferric hydroxide solution .

asked Nov 3, 2016 by meena.p

1 answer

For the reaction $A \to B$ ,the rate of reaction becomes twenty seven times when the concentration of A is increased three times . What is the order of the reaction ?

asked Nov 3, 2016 by meena.p

1 answer

What would happen if no salt bridge were used in an electro chemical cell (like Zn-Cu cell)?

asked Nov 3, 2016 by meena.p

1 answer

If the solubility product of $CuS$ is $ 6 \times 10^{-6}$ calculate the maximum molarity of $CuS$ is aqueous solution

asked Nov 2, 2016 by meena.p

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Define the following terms in relation to crystalline solids . (i) Unit cell (ii) Coordination number . Give one example in each case

asked Nov 2, 2016 by meena.p

1 answer

What is the scientific explaination for the feeling of depression ?

asked Nov 2, 2016 by meena.p

1 answer

What do you understand by denticity of ligand ?

asked Nov 2, 2016 by meena.p

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(a) Illustrate the following reactions giving a suitable example for each : (i) Cross aldol condensation (ii) Decarboxylation (b) Give Simple tests to distinguish between the following pairs of compounds : (i) Pentan -2-one and pentan -3-one (ii) Benzaldehyde and Acetophenone (iii) Phenol and Benzoic acid .

asked Nov 2, 2016 by meena.p

1 answer

(a) Define molar conductivity of a solution and explain how molar conductivity changes with change in concentration of solution for a weak and a strong electrolyte (b) The resistance of a conductivity cell conatining $0.001\;M\;KCL$ Solution at $298\;K$ is $1500 \;\Omega$ . What is the cell constant if the conductivity of $0.001\;M\;KCl$ solution at $298\;K$ is $0.146 \times 10^{-3} \;S \;cm^{-1}$ ?

asked Nov 1, 2016 by meena.p

1 answer

How would you account for the following ? (i) Many of the transition elements are known to form interstitial compounds . (ii) The metallic radii of the third (5d) series of transition metals are virtually the same as those of the corresponding group members of the second (4d) series .(iii) Lanthanoids form primary +3 ions , while the actinoids usually have higher oxidation state in their compounds , +4 or even +6 typical .

asked Nov 1, 2016 by meena.p

1 answer

Calculate the number of unpaired electrons in the following gaseous ions : $(i)Mn^{3+} (ii) Cr^{3+} (iii) V^{3+} (iv) Ti ^{3+} $ Which one of these is most stable in aqueous solutions ?

asked Nov 1, 2016 by meena.p

1 answer

Identify the anode and cathode in the cell written below :$Cu | Cu^{2+}| |Cl^{-} ||Cl_2, Pt$ write the reduction half reaction and oxidation half reaction of the cell

asked Nov 1, 2016 by meena.p

1 answer

$CCl_4$ and water are immisuble whereas ethanol and water are miscible in all proportions. Correlate this behavior with molecular structure of these compounds.

asked Nov 1, 2016 by meena.p

1 answer

a)Draw the structure of A- methylpent -3-en-2-one b) Write the structure of 4 - methyl pent -3-en -2- one

asked Nov 1, 2016 by meena.p

1 answer

Lower alcohol are soluable in water higher alcohols are not why ?

asked Nov 1, 2016 by meena.p

1 answer

How many Isomers are there for octahedral complex $[COCl_2(en)(NH_3)_2]^+$

asked Oct 31, 2016 by meena.p

1 answer

What is the main cause of charge on a colloidal solution ?

asked Oct 31, 2016 by meena.p

1 answer

What is the coordination number of each type of ions in a rock salt type crystal structure ?

asked Oct 31, 2016 by meena.p

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(a) What is the role of benzoyl peroxide in polymerization of ethane ? (b) What are LDPE and HDPE ? How are they prepared?

asked Oct 31, 2016 by meena.p

1 answer

What are common types of secondary structure of proteins ?

asked Oct 31, 2016 by meena.p

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