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Recent questions tagged chemistry
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A first order reaction has a rate constant of $15 \times 10^{-3}S^{-1}$. How long will $5.0 \;g$ of this reactant take to reduce to $3.0 \;g$?
jeemain
chemistry
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Apr 15, 2015
by
meena.p
1
answer
Which of the following show aromatic character ?
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chemistry
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Apr 15, 2015
by
meena.p
1
answer
In the metallurgy of iron, when lime stone is added to the blast furnace, the calcium ion ends up in
jeemain
chemistry
question-paper-4
asked
Apr 15, 2015
by
meena.p
1
answer
Calculate the maximum work done in expanding $16\;g$ of oxygen at $300\;k$ and occupying a volume of $5dm^3$ isothermally until the volume become $25\;dm^3$
jeemain
chemistry
question-paper-4
asked
Apr 15, 2015
by
meena.p
1
answer
What is the oxidation number of sulphere in $Na_2S_4O_6$
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chemistry
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asked
Apr 15, 2015
by
meena.p
1
answer
The atomic weight of an element is $23$ and atomic number is 11. The number of protons , electrons and neutron respectively present in the atom of the element are
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chemistry
question-paper-4
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Apr 15, 2015
by
meena.p
1
answer
Which of the following complex will give white precipitate with $BaCl_2(aq)$
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chemistry
question-paper-4
asked
Apr 15, 2015
by
meena.p
1
answer
Duraluminium is an alloy of
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chemistry
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asked
Apr 15, 2015
by
meena.p
1
answer
A $5 \%$ solution of cane sugar is isotonic with $0.877 \%$ solution of urea. Calculate the molecular mass of urea if the molecular mass of cane sugar is $342$
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chemistry
question-paper-4
asked
Apr 13, 2015
by
meena.p
1
answer
The value of conic product of water at $393\;K$ is
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chemistry
question-paper-4
asked
Apr 13, 2015
by
meena.p
1
answer
On dissolving moderate amount of sodium metal in liquid $NH_3$ at low temperature , Which of the following does not occur ?
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chemistry
question-paper-4
asked
Apr 13, 2015
by
meena.p
1
answer
In Zerewiitinoff's method Grignard 's reagent react with the following
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chemistry
question-paper-4
asked
Apr 13, 2015
by
meena.p
1
answer
A sample of a gas occupies a volume of $512 \;mL$ at $20^{\circ}$ and $74\;cm$ of Hg as pressure. what volume would this gas occupy at $STP$?
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chemistry
question-paper-4
asked
Apr 13, 2015
by
meena.p
1
answer
The main intermediate formed in the reaction of propene with $HBr$ in presence of peroxide is
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chemistry
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Apr 13, 2015
by
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1
answer
Which of the following has largest de broglie wave length given that all have equal velocity ?
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chemistry
question-paper-4
asked
Apr 13, 2015
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1
answer
The halide which is not hydrolysed is
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chemistry
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Apr 13, 2015
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1
answer
Which of the following is a true statement.
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chemistry
question-paper-3
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Apr 13, 2015
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1
answer
2,3 Dibromobutane, when heated with zinc dust yields.
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chemistry
question-paper-3
asked
Apr 13, 2015
by
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1
answer
The ratio of e/m for a cathode ray
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chemistry
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Apr 13, 2015
by
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1
answer
Sodium niytrate decomposes above $800^{\circ}$ to give
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chemistry
question-paper-3
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Apr 13, 2015
by
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1
answer
Pressure cooker reduces cooking time because
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chemistry
question-paper-3
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Apr 13, 2015
by
meena.p
1
answer
Hypo phosphorus acid is
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chemistry
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Apr 13, 2015
by
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1
answer
In the heterogenous equilibrium $CaCO_3 (s) \rightleftharpoons CacO_3 +CO_2 (g)$ What would be the effect of addition of $CaCO_3$ on the equilibrium concentration of $CO_2$?
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chemistry
question-paper-3
asked
Apr 13, 2015
by
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1
answer
A combustible gas is liberated when caustic soda solution is heated with
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chemistry
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asked
Apr 13, 2015
by
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1
answer
For the preparation of 2- propanol methyl magnesium chloride will react with the following reagent
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chemistry
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asked
Apr 12, 2015
by
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1
answer
An electric current of 100 ampere is passed through a molten liquid of sodium chloxde for 5 hours . Calculate the volume of chlorine gas liberated at the electrode at $NTP$
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chemistry
question-paper-3
asked
Apr 12, 2015
by
meena.p
1
answer
Ozonolysis of benzene yield
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chemistry
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asked
Apr 12, 2015
by
meena.p
1
answer
When $CO$ is passed over solid $NaOH$ heat to $200^{\circ}$ , it forms
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chemistry
question-paper-3
asked
Apr 10, 2015
by
meena.p
1
answer
The salt which produces blue colour i borax bead test is
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chemistry
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Apr 10, 2015
by
meena.p
1
answer
The vapour density of $N_2O_4$ at a certain temperature is $30$ . Calculate the percentage dissociation of $N_2O_4$ at this temperature $N_2O_4 (g) \leftrightarrow 2NO_2(g)$
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chemistry
question-paper-3
asked
Apr 10, 2015
by
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1
answer
Paraffins is the common name used for
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chemistry
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asked
Apr 10, 2015
by
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1
answer
$200\;cm^3$ of an aqueous solution contains $1.26 \;g$ a polymer. The osmotic pressure of such solution at $300\;k$ is found to be mass of the polymer.
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chemistry
question-paper-3
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Apr 10, 2015
by
meena.p
1
answer
Which one of the following cons exhibits colour in aqueous solution
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chemistry
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Apr 10, 2015
by
meena.p
1
answer
The number and type of bonds between two carbon atoms in $CaC_2$ are
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chemistry
question-paper-3
asked
Apr 10, 2015
by
meena.p
1
answer
The element with highest density is
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chemistry
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Apr 10, 2015
by
meena.p
1
answer
Find the temperature at which 3 moles of $SO_2$ will occupy a volume of 10 litre at a pressure of $15\;atm\;\qquad a= 6.71\;atm \;liter^2\;mol^{-1}\; ;b= 0.0564 \;liters\;mol^{-1}$
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chemistry
question-paper-3
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Apr 10, 2015
by
meena.p
1
answer
How many optically active teroisomers are possible for butane 2,3 -diol?
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chemistry
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asked
Apr 10, 2015
by
meena.p
1
answer
Gun metal is an alloy of
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chemistry
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asked
Apr 10, 2015
by
meena.p
1
answer
Which enzyme coverts glucose into ethanol
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chemistry
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asked
Apr 10, 2015
by
meena.p
1
answer
Four one liter flasks are separately filled with the gases $O_2,f_2,CH_4$ and $CO_2$ under the same conditions. The ratio of number of molecules in these gases.
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chemistry
question-paper-3
asked
Apr 10, 2015
by
meena.p
1
answer
The possible mechanism of addition reaction between ethene and bromine in non polar medium would be
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chemistry
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asked
Apr 10, 2015
by
meena.p
1
answer
The number of phases present in colloIdal solution is
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chemistry
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asked
Apr 10, 2015
by
meena.p
1
answer
Calomel is
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chemistry
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Apr 10, 2015
by
meena.p
1
answer
The oxidation state of $Fe$ in iron penta carbonyl is
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chemistry
question-paper-3
asked
Apr 9, 2015
by
meena.p
1
answer
$C_7H_8$ show how many isomers.
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chemistry
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asked
Apr 9, 2015
by
meena.p
1
answer
The lubricating action of an oil is more if it possess
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chemistry
question-paper-2
asked
Apr 9, 2015
by
meena.p
1
answer
The compound that is most reactive towards electrophilic nitration is
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chemistry
question-paper-2
asked
Apr 9, 2015
by
meena.p
1
answer
According to bothr's theory , the angular momentum of an electron in 5th orbit is
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chemistry
question-paper-2
asked
Apr 9, 2015
by
meena.p
1
answer
A burning strip of magnesium is introduced into a jar containing a gas. After sometime the walls of the container are coated with carbon. The gas in the container is
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chemistry
question-paper-2
asked
Apr 9, 2015
by
meena.p
1
answer
The amount of heat released during the reaction of $300 \;mL$ of $1M\;HCl$ with $100\;mL$ of $1M\;NaOH$ is
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chemistry
question-paper-2
asked
Apr 9, 2015
by
meena.p
1
answer
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