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Recent questions tagged chemistry
Questions
With the help of an example how one can separate two sulphide ores by froth flotation method .
cbse
class12
chemistry
sec-c
ch-6
isolation-of-elements
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 .
cbse
class12
chemistry
sec-c
ch-5
surface-chemistry
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 ?
cbse
class12
chemistry
sec-c
ch-4
chemical-kinetics
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)?
cbse
class12
chemistry
sec-c
ch-3
electrochemistry
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
cbse
class12
chemistry
sec-c
ch-2
solutions
asked
Nov 2, 2016
by
meena.p
1
answer
Define the following terms in relation to crystalline solids . (i) Unit cell (ii) Coordination number . Give one example in each case
cbse
class12
chemistry
sec-b
ch-1
states-of-matter-solid-state
asked
Nov 2, 2016
by
meena.p
1
answer
What is the scientific explaination for the feeling of depression ?
cbse
class12
chemistry
sec-c
ch-14
biomolecules
asked
Nov 2, 2016
by
meena.p
1
answer
What do you understand by denticity of ligand ?
cbse
class12
chemistry
sec-a
ch-9
coordinate-compounds
asked
Nov 2, 2016
by
meena.p
1
answer
(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 .
cbse
class12
chemistry
sec-e
ch-11
alcohols-phenols-and-ethers
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 $0.146 \times 10^{-3} \;S \;cm^{-1}$ ?
cbse
class12
chemistry
sec-e
ch-3
electrochemistry
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 .
cbse
class12
chemistry
sec-c
ch-8
d-and-f-block-elements
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 ?
cbse
class12
chemistry
sec-b
ch-7
p-block-elements
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
cbse
class12
chemistry
sec-b
ch-3
electrochemistry
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.
cbse
class12
chemistry
sec-b
ch-2
solutions
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
cbse
class12
chemistry
sec-c
ch-12
aldehydes-ketones-and-carboxylic-acids
asked
Nov 1, 2016
by
meena.p
1
answer
Lower alcohol are soluable in water higher alcohols are not why ?
cbse
class12
chemistry
sec-a
ch-11
alcohols-phenols-and-ethers
asked
Nov 1, 2016
by
meena.p
1
answer
How many Isomers are there for octahedral complex $[COCl_2(en)(NH_3)_2]^+$
cbse
class12
chemistry
sec-a
ch-7
p-block-elements
asked
Oct 31, 2016
by
meena.p
1
answer
What is the main cause of charge on a colloidal solution ?
cbse
class12
chemistry
sec-a
ch-5
surface-chemistry
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 ?
cbse
class12
chemistry
sec-a
ch-9
coordinate-compounds
asked
Oct 31, 2016
by
meena.p
1
answer
(a) What is the role of benzoyl peroxide in polymerization of ethane ? (b) What are LDPE and HDPE ? How are they prepared?
cbse
class12
chemistry
sec-c
ch-15
polymers
asked
Oct 31, 2016
by
meena.p
1
answer
What are common types of secondary structure of proteins ?
cbse
class12
chemistry
sec-c
ch-9
coordinate-compounds
asked
Oct 31, 2016
by
meena.p
1
answer
State the uses of carboxylic acids :
cbse
class12
chemistry
sec-c
ch-12
aldehydes-ketones-and-carboxylic-acids
asked
Oct 31, 2016
by
meena.p
1
answer
Explain why phenols do not undergo substitution of the -OH group like alcohols ?
cbse
class12
chemistry
sec-c
ch-11
alcohols-phenols-and-ethers
asked
Oct 31, 2016
by
meena.p
1
answer
What happens when bromine reacts with $CH_3 - C = CH$? How would you justify this reaction ?
cbse
class12
chemistry
sec-c
ch-10
haloalkanes-and-haloarenes
asked
Oct 27, 2016
by
meena.p
1
answer
(i) Why do compounds having similar geometry have different magnetic moment ? (ii)$FeSO_4$ solution mixed with $(NH_4)_2SO_4$ solution in 1 : 1 molar ratio gives the test of $Fe^{2+}$ ion but $CuSO_4$ solution mixed with aqueous ammonia in 1 : 4 molar ratio does not give the test of $Cu^{2+}$ ion. Explain why ?
cbse
class12
chemistry
sec-c
ch-9
coordinate-compounds
asked
Oct 27, 2016
by
meena.p
1
answer
What is meant by disproportionation of an oxidation state ? Give an example
cbse
class12
chemistry
sec-b
ch-7
p-block-elements
asked
Oct 27, 2016
by
meena.p
1
answer
Give the reasons for the following : (a) $CN^{-}$ ions is known but $CP^{-} $ ion is not known (b) $NO_2$ dimerizes to form $N_2O_4$ (c) $ICI$ is more reactive that $I_2$
cbse
class12
chemistry
sec-c
ch-7
p-block-elements
asked
Oct 27, 2016
by
meena.p
1
answer
Out of C and CO, which is a better reducing agent for ZnO ?
cbse
class12
chemistry
sec-c
ch-5
surface-chemistry
asked
Oct 27, 2016
by
meena.p
1
answer
Nitric oxide $NO,$ reacts with oxygen to produce nitrogen dioxide $2 NO(g)+O_2(g) \to 2NO_2(g)$ The rate law for this reaction is : $Rate = k[NO]^2 [O_2]$ Propose a mechanism for the reaction.
cbse
class12
chemistry
sec-c
ch-4
chemical-kinetics
asked
Oct 27, 2016
by
meena.p
1
answer
Account for the following : (i) Alkaline medium inhibits rusting of iron . (ii) Iron does not rust even if the zinc coating is broken in a galvanized iron pipe.
cbse
class12
chemistry
sec-c
ch-6
general-principals-and-processes-of-isolation-of-metals
asked
Oct 27, 2016
by
meena.p
1
answer
Why a person suffering from high blood pressure is advised to take minimum quantity of common salt
cbse
class12
chemistry
sec-c
ch-2
solutions
asked
Oct 26, 2016
by
meena.p
1
answer
If the radius of the octahedral void is r and the radius of the atoms in the close packing is R, derive relationship between r and R.
cbse
class12
chemistry
sec-c
ch-1
states-of-matter-solid-state
asked
Oct 26, 2016
by
meena.p
1
answer
Write chemical equation for the following conversions : (i) Nitro benzene to benzoic acid. (ii) Benzyl chloride to 2-phenylethanamine. (iii) Aniline to benzyl alcohol .
cbse
class12
chemistry
sec-e
ch-12
aldehydes-ketones-and-carboxylic-acids
asked
Oct 26, 2016
by
meena.p
1
answer
What type of a battery is the lead storage battery ? write the anode and the cathode reaction occurring in a lead storage battery when current is drawn from it .
cbse
class12
chemistry
sec-e
ch-3
electrochemistry
asked
Oct 26, 2016
by
meena.p
1
answer
Although chlorine is an electron with drawing group , yet it is ortho- , Para - directing in electrophilic aromatic substitution reaction . Explain why it is so ?
cbse
class12
chemistry
sec-c
ch-11
alcohols-phenols-and-ethers
asked
Oct 26, 2016
by
meena.p
1
answer
How would you obtain (i) Picric acid (2,4,6- trinitrophenol) from phenol (ii) 2- Methyl propene from 2- Methyl propanol ?
cbse
class12
chemistry
sec-b
ch-10
haloalkanes-and-haloarenes
asked
Oct 26, 2016
by
meena.p
1
answer
Predict which of the following will be colourless in aqueous solution ? $Ti^{3+},V^{3+},Sc^{3+},Mn^{2+},Fe^{3+},Co^{2+}$ and $MnO_4^{-}$
cbse
class12
chemistry
sec-b
ch-7
p-block-elements
asked
Oct 26, 2016
by
meena.p
1
answer
Resistance of a conductivity cell filled with $0.1\;mol L^{-1}KCl$ solution is $100\;\Omega$ . If the resistance of the same cell when filled with $0.02\;molL^{-1}\;KCl$ Solution . The conductivity of $0.02\;mol L^{-1}KCl$ Solution . The conductivity of $0.1\;mol\;L^{-1}$ Solution is $1.29\;s/m$
cbse
class12
chemistry
sec-c
ch-3
electrochemistry
asked
Oct 26, 2016
by
meena.p
1
answer
Why is osmotic pressure of $1\;M\;KCl$ higher than $1\;M$ urea solution ?
cbse
class12
chemistry
sec-a
ch-2
solutions
asked
Oct 26, 2016
by
meena.p
1
answer
What type of defect can arises when a solid is heated ? Which physical properly is affected by it and in what way ?
cbse
class12
chemistry
sec-b
ch-1
states-of-matter-solid-state
asked
Oct 26, 2016
by
meena.p
1
answer
Why is drug metabolism a major consideration in drug design ?
cbse
class12
chemistry
sec-b
ch-16
chemistry-in-everyday-life
asked
Oct 25, 2016
by
meena.p
1
answer
How does vulcanization change the properties of natural rubber ?
cbse
class12
chemistry
sec-a
ch-14
biomolecules
asked
Oct 25, 2016
by
meena.p
1
answer
Suggest a reagent for conservation of ethanol to ethanoic acid
cbse
class12
chemistry
sec-a
ch-11
alcohols-phenols-and-ethers
asked
Oct 25, 2016
by
meena.p
1
answer
Do we call metal carbonyls as organometallics ? Why or why not ?
cbse
class12
chemistry
sec-b
ch-9
coordinate-compounds
asked
Oct 25, 2016
by
meena.p
1
answer
Give one example each of oil in water and water in oil emulsion.
cbse
class12
chemistry
sec-a
ch-5
surface-chemistry
asked
Oct 25, 2016
by
meena.p
1
answer
(a)The rate constant for a reaction of zero order in A is $0.0030\;mol L^{-1}S^{-1}$ How long will it take for the initial concentration of A to fall from $0.10\;M$ to $0.075\;M$ ? (b)What type of colloidal sols are formed in the following : (i) Sulphur vapours are passed through colled water (ii) White of an egg is mixed with water . (iii) Soap solution
cbse
class12
chemistry
sec-e
ch-4
chemical-kinetics
asked
Oct 25, 2016
by
meena.p
1
answer
Why does a galvanic cell become dead after some time ?
cbse
class12
chemistry
sec-c
ch-5
surface-chemistry
asked
Oct 25, 2016
by
meena.p
1
answer
Aluminium crystallizes in a cubic - packed structure . Radius of the atom in the metal is $125\;pm$ (i) What is the length of the side of the unit cell ? (ii) How many unit cells are there in $1\;cm^3$ of aluminium ?
cbse
class12
chemistry
sec-b
ch-1
solid-state
asked
Oct 25, 2016
by
meena.p
1
answer
What is the nature of an antacid ?
cbse
class12
chemistry
sec-c
ch-16
chemistry-in-everyday-life
asked
Oct 25, 2016
by
meena.p
1
answer
Write the information asked in the following polymers: (i) Bakelite -Materials used for preparation (ii) Nylon -6,6-Material required for preparation (iii) Synthetic rubber - monomeric repeating unit (iv) PVC - Monomeric repeating unit
cbse
class12
chemistry
sec-c
ch-15
polymers
asked
Oct 24, 2016
by
meena.p
1
answer
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