Recent questions tagged jeemain

A certain quantity of electricity is passed through aqueous $AI_2\: (SO_4)_3\: and \: CuSO_4$ solutions connected in series. 0.09 g of $AI$ is deposited on cathode during electrolysis. The amount of copper deposited on cathode in grams is :

asked Oct 14, 2013 by thanvigandhi_1

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The boiling point of a solution containing 68.4 g of sucrose ( molar mass = 34.2 g $mol^{-1}$) in 100 g of water is :

asked Oct 14, 2013 by thanvigandhi_1

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The weight in g, of the non-volatile solute urea $(NH_2CONH_2)$ to be dissolved in 100 g of water in order to decrease its vapour pressure by 1.8% is:

asked Oct 14, 2013 by thanvigandhi_1

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Two gases of molecular masses $ M_A\: and \: M_B$ are at temperatures $T_A\: and \:T_B$ respectively. If $T_AM_B=T_BM_A$ , which one of the following properties has the same value for both the gases?

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Electrons with a kinetic energy of $6.023 \times 10^4 \;j/mol$ are evolved from a surface of a metal , when it is exposed to radiation of wavelength of $600\;nm$. The minimum amount of energy required to removed an electron from the metal atom is:

asked Oct 14, 2013 by meena.p

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Consider the following statements for the reaction

asked Oct 14, 2013 by thanvigandhi_1

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The total number of antibonding electrons in $N_2\: and \: O_2$ molecules respectively is :

asked Oct 14, 2013 by thanvigandhi_1

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Which one of the following sets correctly represent the increase in the paramagnetic property of the ions?

asked Oct 14, 2013 by meena.p

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The number of $ \sigma\: and \: \pi$ bonds present in acetylene are respectively

asked Oct 14, 2013 by thanvigandhi_1

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The wave lengths of electron waves in two orbits is $3:5$ The ratio of kinetic energy of electrons will be :

asked Oct 14, 2013 by meena.p

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The correct order of atomic radius of $Li, Be\: and \: B $ is

asked Oct 14, 2013 by thanvigandhi_1

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The number of $p \pi-d \pi $ 'pi' bonds present in $XeO_3$ and $XeO_4$ molecules, respectively:

asked Oct 14, 2013 by meena.p

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If the uncertainty in velocity of a moving object is $ 1.0 \times 10^{-6}\: ms^{-1}$ and the uncertainty in its position is 58 m, the mass of this object is approximately equal to that of : $ (h=6.626 \times 10^{-34}js)$

asked Oct 14, 2013 by thanvigandhi_1

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One mole of alkene $\underline {X}$ on ozonolysis gave one mole of acetaldehyde and one mole of acetone. The IUPAC name of $\underline{X}$ is :

asked Oct 14, 2013 by meena.p

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The energy required to overcome the attractive forces on the electrons, w, of some metals is listed below . The number of metals showing photoelectric effect when light of 300 nm wavelength falls on it is :

asked Oct 14, 2013 by thanvigandhi_1

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Sodium thiosulphate reacts with $dil\: HCI$ to form $NaCI,H_2O, \underline X\: and \: \underline Y.\: \underline X$ reacts with $Na_2S$ to form $Na_2S_2O_3$ and $ \underline Y$ . Which one of the following is $ \underline Y$.

asked Oct 14, 2013 by thanvigandhi_1

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The digit at unit place in the number $17^{1995}+11^{1995}-7^{1995}$ is ?

asked Oct 14, 2013 by rvidyagovindarajan_1

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Observe the following statements :

asked Oct 14, 2013 by thanvigandhi_1

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Assertion (A) : $GeF_4$ and $SiCI_4$ act as Lewis bases. Reasons (R) : $Ge$ and $Si$ have d-orbitals to accept electrons.

asked Oct 14, 2013 by thanvigandhi_1

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Observe the following statements :

asked Oct 14, 2013 by thanvigandhi_1

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Orange red coloured monoxide is :

asked Oct 14, 2013 by thanvigandhi_1

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Zinc reacts with hot and concentrated NaOH and forms :

asked Oct 14, 2013 by thanvigandhi_1

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In which of the following reactions $ H_2O_2$ acts as oxidizing agent?

asked Oct 14, 2013 by thanvigandhi_1

1 answer

In the reaction

asked Oct 14, 2013 by thanvigandhi_1

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If the solubility product of $MgF_2$ at a certain temperature is $ 1.08 \times 10^{-10}$ , its solubility in mol $1^{-1}$ is:

asked Oct 14, 2013 by thanvigandhi_1

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Fluorine reacts with dilute $NaOH$ and forms a gaseous and forms a gaseous product $\underline{A}$. The bond angle in the molecule of $\underline{A}$ is :

asked Oct 14, 2013 by meena.p

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Identify the alkyne in the following sequence of reactions:

asked Oct 14, 2013 by meena.p

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For the equilibrium $A_{(g)} \rightleftharpoons B_{(g)}+C_{(g)} ;K_p=0.82 atm$ at $27^{\circ}C$. At the same temperature its $K_c$ in mol $lit^{-1}$ is : ( R=0.082 lit atm $mol^{-1}K^{-1}$)

asked Oct 14, 2013 by thanvigandhi_1

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If $A+B+C=\pi$ then $\sin 2A+\sin 2B+\sin 2C$ is equal to

asked Oct 14, 2013 by sreemathi.v

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Given that $\Delta H_f(H)=218 kJ/mol,$ express the $H-H$ bond energy in Kcal/mol:

asked Oct 14, 2013 by meena.p

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A wheel of radius 0.4 m can rotate freely about its axis as shown in the figure. A string is wrapped over its rim and a mass of 4 kg is hung. An angular acceleration of $8\;rad-s^{-2}$ is produced in it due to the torque. Then moment of inertia of the wheel is :

asked Oct 14, 2013 by meena.p

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Fluorine reactes with $ KHSO_4$ to form HF and $ \underline X$. Which one of the following is $ \underline X$?

asked Oct 14, 2013 by thanvigandhi_1

1 answer

$\large\frac{\tan 3x}{\tan x}$ lies between

asked Oct 14, 2013 by sreemathi.v

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Identify the correct set

asked Oct 14, 2013 by thanvigandhi_1

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A rod of length l is held vertically stationary with its lower and located at a point 'P', on the horizontal plane. When the rod is released to topple about 'P', the velocity of the upper end of the rod with which it hits the ground is :

asked Oct 14, 2013 by meena.p

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Two persons A and B are located in X-Y plane at the points at the points (0,0) and (0,10) respectively. (The distance are measured in MKS units). At a time $t=0$, they start moving simultaneously with velocities $\bar {v}_A=2 \hat j m/s$ and $\bar v_B=2 \hat i m/s$ respectively. The time after which A and B are at their closest distance is :

asked Oct 14, 2013 by meena.p

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The coefficient of $x^5$ in the expansion of $(1+x)^{21}$ + $(1+x)^{22}$ + ...... + $(1+x)^{30}$ is

asked Oct 14, 2013 by rvidyagovindarajan_1

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Observe the following statements :

asked Oct 14, 2013 by thanvigandhi_1

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During the manufacture of cast iron, the slag ($ CaSiO_3$) is formed in

asked Oct 14, 2013 by thanvigandhi_1

1 answer

A bullet of mass $0.02\;kg$ travelling horizontally with velocity $250\;ms^{-1}$ strikes a block of wood of mass $0.23\;kg $ which rests on a rough horizontal surface. After the impact, the block and bullet move together and come to rest after travelling a distance of $40\;m$ . The coefficient of sliding friction of the rough surface is : $(g=9/8 ms^{-2})$

asked Oct 14, 2013 by meena.p

1 answer

Find the value of $\sin 67\large\frac{1}{2}^{\large\circ}$ & $\cos 67\large\frac{1}{2}^{\large\circ}$

asked Oct 14, 2013 by sreemathi.v

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Match the following :

asked Oct 14, 2013 by thanvigandhi_1

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Currents flowing in each of the following circuits A and B respectively are :

asked Oct 14, 2013 by meena.p

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The value of $\sqrt{2+\sqrt{2+\sqrt{2+2\cos 8\theta}}}$ where $\theta < \theta<\large\frac{\pi}{8}$ is equal to

asked Oct 14, 2013 by sreemathi.v

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The radio activity of a sample is $'X'$ at a time $'t_1'$ and $'Y'$ at a time '$t_2'$. If the mean life time of the specimen is 't', the number of atoms that have disintegrated in the time interval $(t_1-t_2)$ is :

asked Oct 14, 2013 by meena.p

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A photon of energy 'E' ejects a photo electron from a metal surface whose work function is $W_0$. If this electron enters into a uniform magnetic field of induction 'B' in a direction perpendicular to the field and describes a circular path of radius 'R' , then the radius 'r' is given by , (in the usual notation):

asked Oct 14, 2013 by meena.p

2 answers

The work function of a certain metal is $3.31 \times 10^{-19}\;J$. Then the maximum kinetic energy of photo electrons emitted by radiation of wavelength 5000 A is : (given $h=6.62 \times 10^{-34}\;J-s, C= 3 \times 10^{8}ms^{-1},e= 1.6 \times 10^{-19}$ coul.)

asked Oct 14, 2013 by meena.p

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If $\sin\theta=n\sin(\theta+2\alpha)$ then $tan(\theta+\alpha)$ is equal to

asked Oct 14, 2013 by sreemathi.v

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An infinitely long straight conductor is bent into the shape as shown below. It carries a current of i Amps, and the circular loop is R meters. Then the magnitude of magnetic induction at the center of the circular loop is :

asked Oct 14, 2013 by meena.p

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If $P_n$ denotes the product of binomial coeff. in the expansion of $(1+x)^n$, then $\large\frac{P_{n+1}}{P_n}$=?

asked Oct 14, 2013 by rvidyagovindarajan_1

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