Recent questions tagged jeemain

If $\overrightarrow a,\overrightarrow b\:and\:\overrightarrow c$ are non zero vectors that are pair wise non-collinear and if $\overrightarrow a+3\overrightarrow b$ is collinear with $ \overrightarrow c$ and $\overrightarrow b+2\overrightarrow c $ is collinear with $\overrightarrow a$, then $\overrightarrow a+3\overrightarrow b+6\overrightarrow c=?$

asked Nov 9, 2013 by rvidyagovindarajan_1

1 answer

The formal changes of $ N_{(1)}, N_{(2)}$ and $O$ atoms in : $ \ddot{N_{(1)}} =\ddot{N_{(2)}} = \ddot {O} : $ are respectively :

asked Nov 9, 2013 by thanvigandhi_1

0 answers

Which one of the following is correct order of second ionization potential of Na, Ne, Mg and AI?

asked Nov 9, 2013 by thanvigandhi_1

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If $|\overrightarrow a+\overrightarrow b|=\sqrt {29}$ and $\overrightarrow a\times (2\hat i+3\hat j+4\hat k)=(2\hat i+3\hat j+4\hat k)\times \overrightarrow b,$ then $(\overrightarrow a+\overrightarrow b).(-7\hat i+2\hat j+3\hat k)=?$

asked Nov 9, 2013 by rvidyagovindarajan_1

1 answer

According to Bohr's theory, which one of the following values of angular momentum of hydrogen atom is not permitted ?

asked Nov 9, 2013 by thanvigandhi_1

0 answers

Which one of the following frequencies of radiation ( in Hz) has a wavelength of 600 nm?

asked Nov 9, 2013 by thanvigandhi_1

0 answers

Assertion (A) : Cyclohexane is the most stable Cycloalkane. Reasons (R) : Cyclopropane and cyclobutane are less stable due to angle strain and torsional strain.

asked Nov 9, 2013 by thanvigandhi_1

0 answers

0.16 gms of an organic compound containing sulphur produces 0.233 gms of $BaSO_4$. Percentage of sulphur in the compound is :

asked Nov 9, 2013 by thanvigandhi_1

0 answers

Which air pollutant is responsible for Bhopal gas tragedy ?

asked Nov 9, 2013 by thanvigandhi_1

1 answer

Which one of the following oxides is reduced by water gas to obtain the metal during its extraction ?

asked Nov 9, 2013 by thanvigandhi_1

0 answers

Identify the order in which the spin only magnetic moment ( in BM) increases for the following four ions :

asked Nov 9, 2013 by thanvigandhi_1

0 answers

The hybridization of Xe and the number of lone pairs of electrons on it in $XeF_6$ are :

asked Nov 9, 2013 by thanvigandhi_1

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What is the bond angle $(\hat{OCIO})$ in $CIO_2$?

asked Nov 9, 2013 by thanvigandhi_1

0 answers

What are the products formed when moist chlorine gas is reacted with hypo?

asked Nov 9, 2013 by thanvigandhi_1

0 answers

The total number of $ \sigma\: and \: \pi$ bonds in pyrophosphoric acid are respectively :

asked Nov 9, 2013 by thanvigandhi_1

0 answers

Which one of the following is a correct set?

asked Nov 9, 2013 by thanvigandhi_1

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Which one of the following statement is not correct?

asked Nov 9, 2013 by thanvigandhi_1

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In which of the following reactions hydrogen is not liberated?

asked Nov 9, 2013 by thanvigandhi_1

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Which property among the following is same for both hydrogen and deuterium molecules?

asked Nov 9, 2013 by thanvigandhi_1

0 answers

Which one of the following gives a straight line for Freundlich adsorption isotherm?

asked Nov 9, 2013 by thanvigandhi_1

1 answer

What is the entropy change in $ J.K^{-1}$ during the melting of 27.3 grams of ice at $ 0^{\circ}C$ ? (Latent heat of fusion of ice = 330 $ j.g^{-1}$)

asked Nov 9, 2013 by thanvigandhi_1

0 answers

The pH of 0.05 M acetic acid is $ ( K_a = 2 \times 10^{-5} )$

asked Nov 9, 2013 by thanvigandhi_1

0 answers

If the equilibrium constant for the reaction $ 2AB \rightleftharpoons A_2+B_2 \: is \: 49$, what is the equilibrium constant for $ AB \rightleftharpoons \large\frac{1}{2}\: A_2 + \large\frac{1}{2}B_2$?

asked Nov 9, 2013 by thanvigandhi_1

0 answers

If $|\overrightarrow a|=3,\:|\overrightarrow b|=\large\frac{\sqrt 2}{3}$, then $\overrightarrow a\times\overrightarrow b$ is a unit vector if the angle between $\overrightarrow a$ and $\overrightarrow b$ is ?

asked Nov 8, 2013 by rvidyagovindarajan_1

1 answer

The number of distinct real values of $\lambda$ for which the vectors $-\lambda^2\hat i+\hat j+\hat k,\:\hat i-\lambda^2\hat j+\hat k\:and\:\hat i+\hat k-\lambda^2 \hat k$ are coplanar is?

asked Nov 8, 2013 by rvidyagovindarajan_1

1 answer

The vapour pressure of water at $23^{\circ}$ is $19.8\;mm. 0.1$ mole of glucose is dissolved in $178.2\;g$ of water. What is the vapour pressure (in mm) of the resultant solution ?

asked Nov 8, 2013 by meena.p

0 answers

A and B are ideal gases. The molecular weights of A and B are in the ratio of 1:4 . The pressure of a gas mixture containing equal weights of A and B is P atm. What is the partial pressure (in atm) of B in the mixture ?

asked Nov 8, 2013 by meena.p

0 answers

In the reaction

asked Nov 8, 2013 by meena.p

0 answers

x grams of calcium carbonate was completely burnt in air. The weight of the solid residue formed is 28 g. What is the value of x (in grams)?

asked Nov 8, 2013 by meena.p

0 answers

Which of the following is correct ?

asked Nov 8, 2013 by meena.p

0 answers

'Natalite' is used as:

asked Nov 8, 2013 by meena.p

1 answer

Which of the following is a linear molecule ?

asked Nov 8, 2013 by meena.p

0 answers

Identify the correct order in which the covalent radius of the following elements increases:

asked Nov 8, 2013 by meena.p

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3-hydroxybutanal is formed when (X) reacts with (Y) in dilute (Z) solution. What are X,Y and Z?

asked Nov 8, 2013 by meena.p

0 answers

The half-lives of two radioactive nuclides A and B are taken separately and allowed to disintegrate for 4 min. What will be the ratio of weights of A and B disintegrated?

asked Nov 8, 2013 by meena.p

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If $\overrightarrow {OA}=\overrightarrow a,\:\overrightarrow {AB}=6\overrightarrow a+2\overrightarrow b\:and\:\overrightarrow {OC}=\overrightarrow b$, $p$ is area of quadrateral $OACB$ and $q$ is area of parallelogram with $OA$ and $OC$ as adjacent sides, and if $p=x.q$, then $x=?$

asked Nov 8, 2013 by rvidyagovindarajan_1

1 answer

An electron is moving in Bohr's fourth orbit. It's de-Broglie wave length is $\lambda$. What is the circumference of the fourth orbit ?

asked Nov 8, 2013 by meena.p

2 answers

Which of the following , compounds is the reactant in Rosenmund's reduction?

asked Nov 8, 2013 by meena.p

0 answers

The atomic numbers of elements X,Y and Z are 19,21 and 25 respectively. The number of electrons present in the M shell of these elements follow the order:

asked Nov 8, 2013 by meena.p

1 answer

In which of the following reactions the product is an ether ?

asked Nov 8, 2013 by meena.p

1 answer

Which of the following is an example for heterogeneous catalysis reaction?

asked Nov 8, 2013 by meena.p

1 answer

Which one of the following reactions does not form gaseous product ?

asked Nov 8, 2013 by meena.p

0 answers

Identify A and B in the following reactions:

asked Nov 8, 2013 by meena.p

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Sodium is heated in air at $300 ^{\circ}C$ to form x.x absorbs $CO_2$ and forms $Na_2CO_3$ and Y. Which of the following is Y?

asked Nov 8, 2013 by meena.p

0 answers

Observe the following statements regarding purification of bauxite:

asked Nov 8, 2013 by meena.p

0 answers

The chemicals and the reaction conditions required for the preparation of ethane are :

asked Nov 8, 2013 by meena.p

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A complex compound of $Co^{3+}$ with molecular formula $CoCl_x.yNH_3$ gives a total of 3 ions when dissolved in water. How many $Cl^{-}$ ions satisfy both primary and secondary valencies in this complex ?

asked Nov 8, 2013 by meena.p

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In Fischer-Ringe 's method of separation of nobles gas mixture from air, ................... is used:

asked Nov 8, 2013 by meena.p

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An n-p-n transistor power amplifier in C-E configuration gives :

asked Nov 8, 2013 by meena.p

1 answer

Particles and their anti- particles have:

asked Nov 8, 2013 by meena.p

1 answer

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