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Recent questions tagged chemistry
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In context with the industrial preparation of hydrogen water gas $(CO+H_2)$, Which of the following is the correct statement ?
jeemain
chemistry
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Apr 9, 2015
by
meena.p
1
answer
When an electric current of $0.5\;ampere$ passed through acidulated water for two hours then volume of hydrogen $(H_2)$ at $NTP$ produced at cathode will be.
jeemain
chemistry
question-paper-2
asked
Apr 9, 2015
by
meena.p
1
answer
Which one of the following pair of species have the same bond order ?
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chemistry
question-paper-2
asked
Apr 9, 2015
by
meena.p
1
answer
In the gaseous phase reaction : $A_2(g) \to B(g) +\bigg( \large\frac{1}{2}$$C(g)$ the increase in pressure from 100 mm to 120 mm is noticed in 5 minute. The rate of disappearance of $A_2$ in mm $min^{-1}$ is
jeemain
chemistry
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Apr 9, 2015
by
meena.p
1
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The organic chloro compound , Which shows completed stereo chemical inversion during $SN_2$ reaction is
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chemistry
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asked
Apr 9, 2015
by
meena.p
1
answer
The ionization enthalpy of hydrogen atom is $ 1.312 \times 10^6\;J\;mol^{-1}$. The energy required to exit the electron in the atom from $n=1\;to \;n=2$ is
jeemain
chemistry
question-paper-2
asked
Apr 9, 2015
by
meena.p
1
answer
Phenol, When it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives,
jeemain
chemistry
question-paper-2
asked
Apr 9, 2015
by
meena.p
1
answer
A buffer solution has equal volume of $0.2\;M,NH_4OH$ and $0.02 \;MNH_4 Cl$. The Pkb of the base is 5. the $PH$ is
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chemistry
question-paper-2
asked
Apr 8, 2015
by
meena.p
1
answer
Which one is reversible process : -
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chemistry
question-paper-2
asked
Apr 8, 2015
by
meena.p
1
answer
Which of the following factors is of no significance for roasting sulfide oxe to the oxides and not subjecting the sulfide are to carbon reduction directly ?
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chemistry
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asked
Apr 8, 2015
by
meena.p
0
answers
Which of the following factors is of no significance for roasting sulfide oxe to the oxides and not subjecting the sulfide are to carbon reduction directly ?
jeemain
chemistry
question-paper-2
asked
Apr 8, 2015
by
meena.p
1
answer
Mortar is a mixture of
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chemistry
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Apr 8, 2015
by
meena.p
1
answer
The solubility of carbonates decrease down the omagnesium group due to decrease in
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chemistry
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Apr 8, 2015
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meena.p
1
answer
Sodium amalgam is used as
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chemistry
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Apr 8, 2015
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1
answer
The treatment of $CH_3Mgx$ with $CH_3 C \equiv C-H$ produce
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chemistry
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Apr 8, 2015
by
meena.p
1
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The formation of the oxide ion $0^{2-} (g)$ requires first on exothermic and then an endothermic step. $O_{(g)} +e^- \to O^{-} _{(g)}; \Delta r^{\circ} =-142\;kj mol^{-1}$$O_{(g)} +e^- \to O^{2-}_{(g)}; \Delta r^{\circ} =+844\;kj mol^{-1}$This is because of
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chemistry
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Apr 8, 2015
by
meena.p
1
answer
With increase in temperature , which of these changes?
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chemistry
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Apr 8, 2015
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meena.p
1
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In the castner's process for the extraction of sodium , the anode is made of ________ metal.
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chemistry
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Apr 8, 2015
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1
answer
In organic reactions, sodium in liquid ammonia is used as
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chemistry
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Apr 8, 2015
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meena.p
1
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Which is the oxidation number of cr in $K_2Cr_2O_7$?
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chemistry
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Apr 8, 2015
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meena.p
1
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Amount of oxalic and present in a solution can be determined by its nitration with $kM_nO_4$ solution in the presence of $H_2SO_4$ . The nitration gives unsatisfactory result when carried out in the presence of Hcl because Hcl
sat
chemistry
oxidation & reduction
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question-paper-2
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Apr 8, 2015
by
meena.p
1
answer
The first order reaction is $20 \%$ complete in 10 minutes. calculate the time taken for the reaction to go to $80\%$ completion
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chemistry
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Apr 8, 2015
by
meena.p
1
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The $pKa$ of a weak acid, $HA$ is $4.80$ . The $pKb$ of a weak base BOH is $4.78$. The PH of an aqueous solution of the corresponding salt, BA will be
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chemistry
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Apr 8, 2015
by
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1
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The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is
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chemistry
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Apr 8, 2015
by
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1
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A gas expands by $0.5$ liter against a constant pressure of one atmosphere . Calculate the work done in joule.
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chemistry
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Apr 8, 2015
by
meena.p
1
answer
What is the ratio between the energies of two radiations one with a wave lebgth of $6000A^{\circ}$ and other with $2000 A^{\circ}$?
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chemistry
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Apr 8, 2015
by
meena.p
1
answer
What is the ratio between the energies of two radiations one with a wave lebgth of $6000a^{\circ}$ and other with $2000 A^{\circ}$?
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chemistry
question-paper-ii
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Apr 8, 2015
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meena.p
0
answers
The most abundant metal in earth 's trust is
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chemistry
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Apr 8, 2015
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meena.p
1
answer
Calculate the mass of 1.5 gram molecule of sulphuric acid .
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chemistry
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Apr 8, 2015
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1
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The reaction toluene with chlorine in presence of ferric chloride gives predominately
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chemistry
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asked
Apr 8, 2015
by
meena.p
1
answer
The total number of electrons in one molecule of carbon dioxide is :
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chemistry
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Apr 8, 2015
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meena.p
1
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In reaction $6NaOH +3cl_2 \to 5 Nacl +A+3 H_2O$ . The oxidation number in 'A' is
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chemistry
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asked
Apr 8, 2015
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meena.p
1
answer
$Zn^{2+}$ dissolves in excess of $NaOH$ due to the formation of :
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chemistry
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asked
Apr 7, 2015
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meena.p
1
answer
Aqueous sodium hydroxide reacts with white phosphorous to form phosphine and
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chemistry
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asked
Apr 7, 2015
by
meena.p
1
answer
The total charge required for complete electrolysis is
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chemistry
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Apr 7, 2015
by
meena.p
1
answer
Of the following , the metal that cannot be obtained by electrolysis of aqueous solution of their salt are
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chemistry
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Apr 7, 2015
by
meena.p
1
answer
The first conization potential of four consecutive elements, present in the second period of the periodic table are $8.3,11.3,14.5$ and $13.6\;ev$ respectively. Which one of the following is the first conization potential (in ev) of nitrogen ?
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chemistry
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asked
Apr 7, 2015
by
meena.p
1
answer
The maximum oxidation states shown by $Ru$ and $Os$ , respectively are :
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chemistry
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asked
Apr 7, 2015
by
meena.p
1
answer
An aromatic molecule will :
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chemistry
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asked
Apr 7, 2015
by
meena.p
1
answer
Two solutions of a substance are mixed in the following manner. $480 \;ml $ of $1.5\;M$ First solution +$520\;ml\;of\;1.2 M$ second solution . What is the molarity of the final mixture?
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chemistry
question-paper-1
asked
Apr 7, 2015
by
meena.p
1
answer
The bonds present in $N_2O_5$ are
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chemistry
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Apr 7, 2015
by
meena.p
1
answer
Element X is strong electropositive and element Y is strongly electro negative. Both are univalint . The compound formed formed will be
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chemistry
question-paper-1
asked
Apr 7, 2015
by
meena.p
1
answer
The chemical formula of feldspar is
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chemistry
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asked
Apr 7, 2015
by
meena.p
1
answer
The correct order of stability for the following super oxides is
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chemistry
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asked
Apr 7, 2015
by
meena.p
1
answer
An isomer of ethanol is
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chemistry
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Apr 7, 2015
by
meena.p
1
answer
The number of isomers of $C_6H_{14}$ is
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chemistry
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Apr 7, 2015
by
meena.p
1
answer
The de Broglie wavelengths of electron waves in $3:5$ . The ratio of kinetic energy of electrons will be
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chemistry
question-paper-1
asked
Apr 7, 2015
by
meena.p
1
answer
The orbital angular momentum of an electron in 2s orbital is
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chemistry
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asked
Apr 7, 2015
by
meena.p
1
answer
The number of radial nodes of 3s and 2 p orbitals are respectively.
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chemistry
question-paper-1
asked
Apr 7, 2015
by
meena.p
1
answer
The ratio of radii of first three orbits in hydrogen atom is
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chemistry
question-paper-1
asked
Apr 6, 2015
by
meena.p
1
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