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Recent questions and answers in 2004
Questions
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JEEMAIN and NEET
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JEEMAIN PAST PAPERS
>>
2004
Acetyl bromide reacts with excess of $CH_3MgI$ followed by treatment with a saturated solution of $NH_4Cl$ given
jeemain
chemistry
past papers
2004
144
answered
May 13, 2020
by
meena.clay6
1
answer
On mixing ethyl acetate with aqueous sodium chloride, the composition of the resultant solution is
jeemain
chemistry
past papers
2004
143
answered
May 13, 2020
by
meena.clay6
2
answers
The compound formed on heating chlorobenzene with chloral in the presence concentrated sulphuric acid is
jeemain
chemistry
past papers
2004
142
answered
May 13, 2020
by
meena.clay6
2
answers
Which base is present in RNA but not in DNA ?
jeemain
chemistry
past papers
2004
141
answered
May 13, 2020
by
meena.clay6
2
answers
Consider the acidity of the carboxylic acids :
jeemain
chemistry
past papers
2004
139
answered
May 13, 2020
by
meena.clay6
2
answers
Amongst the following compound, the optically active alkane having lowest molecular mass is
jeemain
chemistry
past papers
2004
138
answered
May 12, 2020
by
meena.clay6
1
answer
Rate of the reaction <br> <br> is fastest when Z is
jeemain
chemistry
past papers
2004
137
answered
May 12, 2020
by
meena.clay6
1
answer
Which of the folowing will have meso-isomer also ?
jeemain
chemistry
past papers
2004
136
answered
May 12, 2020
by
meena.clay6
1
answer
Which one of the following does not have $sp^2$ hybridized carbon ?
jeemain
chemistry
past papers
2004
135
answered
May 12, 2020
by
meena.clay6
1
answer
Which one of the following has the minimum boiling point ?
jeemain
chemistry
past papers
2004
133
answered
May 12, 2020
by
meena.clay6
1
answer
The ammonia evolved from the treatment of $0.30\;g$ of an organic compound for the estimation of nitrogen was passed in $100\; mL$ of $0.1\; M$ sulphuric acid. The excess of acid required $20 \; mL$ of $0.5\;M$ sodium hydroxide solution hydroxide solution for complete neutralization. The organic compound is
jeemain
chemistry
past papers
2004
132
answered
May 12, 2020
by
meena.clay6
1
answer
The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is
jeemain
chemistry
past papers
2004
131
answered
May 11, 2020
by
meena.clay6
1
answer
The half-life of a radioisotope is four hours. If the inital mass of the isotope was 200 g, the mass remaining after 24 hours undecayed is
jeemain
chemistry
past papers
2004
130
answered
May 11, 2020
by
meena.clay6
2
answers
The correct order of magnetic moments (spin only values in B.M.) among is <br> (Atomic numbers : Mn = 25; Fe = 26; Co = 27 )
jeemain
chemistry
past papers
2004
128
answered
May 11, 2020
by
meena.clay6
2
answers
Which one of the following has largest number of isomers ? <br> (R - =alkyl group, en = ethylenediamine )
jeemain
chemistry
past papers
2004
127
answered
Apr 23, 2020
by
meena.clay6
1
answer
Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect ?
jeemain
chemistry
past papers
2004
126
answered
Apr 23, 2020
by
meena.clay6
1
answer
Coordination compound have great importance in biological systems. In this context which of the living following statements is incorrect ?
jeemain
chemistry
past papers
2004
125
answered
Apr 23, 2020
by
meena.clay6
1
answer
Which one of the following complexes in an outer orbital complex ?
jeemain
chemistry
past papers
2004
124
answered
Apr 23, 2020
by
meena.clay6
1
answer
The coordination number of central metal aom in a complex is determined by
jeemain
chemistry
past papers
2004
123
answered
Apr 23, 2020
by
meena.clay6
1
answer
Among the properties (a) reducing (b) oxidising (c) complexing, the set of properties shown by $CN^-$ ion towards metal species is
jeemain
chemistry
past papers
2004
122
answered
Apr 23, 2020
by
meena.clay6
1
answer
Excess of $KI$ reacts with $CuSO_4$ solution and then $Na_2S_2O_3$ solution is added to it. Which of the statements is incorrect for this reaction ?
jeemain
chemistry
past papers
2004
121
answered
Apr 13, 2020
by
meena.clay6
1
answer
The $E^{\circ}_{M^{+3}/M^{2+}}$ values for $Cr, \; Mn, \; Fe$ and $Co$ are $-0.41, \; +1.57, \; + 0.77$ and $+1.97 /;\;V$ respectively. For which one of these metals the change in oxidation state form $+2$ and $+3$ is easiest ?
jeemain
chemistry
past papers
2004
120
answered
Apr 13, 2020
by
meena.clay6
1
answer
The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to
jeemain
chemistry
past papers
2004
119
answered
Apr 13, 2020
by
meena.clay6
1
answer
Aluminium chloride exists as dimer, $Al_2Cl_6$ in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives
jeemain
chemistry
past papers
2004
118
answered
Apr 13, 2020
by
meena.clay6
1
answer
Beryllium and aluminium exhibit many properties which are similar. But the two elements differ in
jeemain
chemistry
past papers
2004
117
answered
Apr 9, 2020
by
meena.clay6
1
answer
Which one of the following ores is best concentrated by froth-floatation method ?
jeemain
chemistry
past papers
2004
116
answered
Apr 9, 2020
by
meena.clay6
1
answer
One mole of magnesium nitride on the reaction with an excess of water gives
jeemain
chemistry
past papers
2004
115
answered
Apr 9, 2020
by
meena.clay6
1
answer
Identify the correct statements regarding enzymes
jeemain
chemistry
past papers
2004
114
answered
Apr 9, 2020
by
meena.clay6
1
answer
Which one the following statement regarding helium is incorrect ?
jeemain
chemistry
past papers
2004
113
answered
Apr 9, 2020
by
meena.clay6
1
answer
In a cell that utilises the reaction $Zn(s) + 2H^+(aq) \to Zn^{2+} (aq) + H_2(g)$ addition of $H_2SO_4$ to cathode compartment, will
jeemain
chemistry
past papers
2004
112
answered
Apr 9, 2020
by
meena.clay6
1
answer
The limiting molar conductivities $\bigwedge^{\circ}$ for $NaCl,\;KBr$ and $KCl$ are $126, \;152$ and $150\; S\; cm^2 \; mol^{-1}$ respectively. The $\bigwedge^{\circ}$ for $NaBr$ is
jeemain
chemistry
past papers
2004
111
answered
Apr 9, 2020
by
meena.clay6
1
answer
The enthalpies of combustion of carbon and carbon monoxide are $-393.5$ and $-283 \; kJ\; mol^{-1}$ respectively. The enthalpy of formation of carbon monoxide per mole is
jeemain
chemistry
past papers
2004
110
answered
Apr 9, 2020
by
meena.clay6
1
answer
The standard e.m.f of a cell, involving one electron change is found to be 0.591 V at $25^{\circ}C$. The equilibrium constant of the reaction is $(F = 96,500\;C\;mol^{-1} : R = 8.314 \; JK^{-1}\;mol^{-1})$
jeemain
chemistry
past papers
2004
109
answered
Apr 9, 2020
by
meena.clay6
1
answer
The molar solubility products is $K_{sp}$. 's' is given in terms of $K_{sp}$ by the relation
jeemain
chemistry
past papers
2004
108
answered
Apr 9, 2020
by
meena.clay6
1
answer
Consider the following $E^{\circ}$ values <br> $E^{\circ}_{Fe^{3+}/Fe^{2+}} = 0.77V$ <br> $E^{\circ}_{Sn^{2+}/Sn} = -0.14V$ <br> Under standard conditions the potential for the reaction <br> $Sn(s) + 2Fe^{3+}(aq) \to 2Fe^{2+} (aq) + Sn^{2+}(aq)$ is
jeemain
chemistry
past papers
2004
107
answered
Apr 9, 2020
by
meena.clay6
1
answer
The rate equation for the reaction $2A + B \to C$ is found to be : rate $k[A][B]$. The correct statement in relation to this reaction is that the
jeemain
chemistry
past papers
2004
106
answered
Apr 8, 2020
by
meena.clay6
1
answer
The equilibrium constant for the reaction $N_2(g) +O_2(g) \leftrightharpoons 2NO(g)$ at temperature $T$ is $4 \times 10^{-4}$. The value of $Kc$ for the reaction $NO(g) \leftrightharpoons \frac{1}{2} N_2 (g) + \frac{1}{2} O_2 (g) $ at the same temperature is
jeemain
chemistry
past papers
2004
105
answered
Apr 8, 2020
by
meena.clay6
1
answer
For the reaction, $CO(g) + Cl_2 (g) \leftrightharpoons COCl_2(g) $ the $\frac{K_p}{K_c}$ is equal to
jeemain
chemistry
past papers
2004
104
answered
Apr 8, 2020
by
meena.clay6
1
answer
What is the equilibrium expression for the reaction $P_{4(s)} + 5O_{2(g)} \leftrightharpoons P_4O_{10 (s)} $?
jeemain
chemistry
past papers
2004
103
answered
Apr 8, 2020
by
meena.clay6
1
answer
In first order reaction, the concentration of the reactant decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is
jeemain
chemistry
past papers
2004
102
answered
Apr 7, 2020
by
meena.clay6
1
answer
In hydrogen-oxygen fuel cell, combustion of hydrogen occurs to
jeemain
chemistry
past papers
2004
101
answered
Apr 7, 2020
by
meena.clay6
1
answer
An ideal gas expands in volume from $1 \times 10^{-3} m^{3} $ to $1 \times 10^{-2} m^3$ at 300 K against a constant pressure of $1 \times 10^5 \; Nm^{-2}$. The work done is
jeemain
chemistry
past papers
2004
100
answered
Apr 7, 2020
by
meena.clay6
1
answer
What type of crystal defect is indicated in the diagram below ? <br>
jeemain
chemistry
past papers
2004
99
answered
Apr 7, 2020
by
meena.clay6
1
answer
Which of the following liquid pairs shows a positive derivation from Raoult's law?
jeemain
chemistry
past papers
2004
97
answered
Apr 7, 2020
by
meena.clay6
1
answer
For which of the following parameters the structural isomers $C_2H_5OH$ and $CH_3OCH_3$ would be expected to have the same values ? <br> (Assume ideal behaviour)
jeemain
chemistry
past papers
2004
96
answered
Apr 7, 2020
by
meena.clay6
1
answer
To neutralize completely $20\; mL$ of $0.1\; M$ aqueous solution of phosphorous acid $(H_3PO_3)$, the volume of $0.1 \; M$ aqueous $KOH$ solution required is
jeemain
chemistry
past papers
2004
95
answered
Apr 7, 2020
by
meena.clay6
1
answer
When p-n junction diode is forward biased
jeemain
physics
past papers
2004
225
asked
Nov 5, 2018
by
pady_1
0
answers
The manifestation of band structure in solids is due to
jeemain
physics
past papers
2004
224
asked
Nov 5, 2018
by
pady_1
0
answers
A piece of copper and another of germanium are cooled from room temperature to 77 K, the resistance of
jeemain
physics
past papers
2004
223
asked
Nov 5, 2018
by
pady_1
0
answers
For a transistor amplifier in common emitter configuration having load impedance of $1 \; k \Omega\; (h_{fe} = 50$ and $h_{oe} = 25)$ the current gain is
jeemain
physics
past papers
2004
222
asked
Nov 5, 2018
by
pady_1
0
answers
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