Recent questions tagged jeemain

The Cubic Unit cell of a metal (molar mass $=63.55\;g\;mol^{-1})$ has an edge length of $362\;pm$. Its density is $8.92\;g.cm^{-3}$. The type of unit cell is :

asked Oct 15, 2013 by meena.p

1 answer

At $25^{\circ}$ the molar conductances at infinite dilution for the strong electrolytes $NaOH,NaCl$ and $Bacl_2$ are $248 \times 10^{-4},126 \times 10^{-4}$ and $280 \times 10^{-4}s.m^2. mol^{-1}$ respectively . $\lambda^{\circ}_mBa(OH)_2$ in $s.m^2 mol^{-1}$:

asked Oct 15, 2013 by meena.p

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The synthesis of crotonaldehyde from acetaldehyde is an example of .................. reaction.

asked Oct 15, 2013 by meena.p

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For the following cell reaction $Ag | Ag^{+} | AgCl | Cl^{\ominus } | Cl_2,Pt\; \Delta G^{\circ}_f (AgCl)=-109\; kJ/mol;$$\Delta G^{\circ}_f (Cl^{\ominus})=-129 \; kJ/mol;\Delta G^{\circ}_f (Ag^+)=78\; kJ/mol ; E^{\circ}$ of the cell is :

asked Oct 15, 2013 by meena.p

1 answer

Consider the following reaction

asked Oct 15, 2013 by meena.p

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Assertion (A) : Presence of xylem vessels is a primitive character. Reasons (R) : Xylem vessels are present in some pteridophytes like selaginella.

asked Oct 15, 2013 by thanvigandhi_1

1 answer

A DNA double helix is 340 nm long. The number of nucleotides in this DNA is

asked Oct 15, 2013 by thanvigandhi_1

1 answer

Identify the correct pair of statements from the following

asked Oct 15, 2013 by thanvigandhi_1

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During the depression of freezing point experiment an equilibrium is established between the molecules of :

asked Oct 15, 2013 by meena.p

1 answer

Parkinson's disease is linked to abnormalities in the level of dopamine in the body. The structure of dopamine is :

asked Oct 15, 2013 by meena.p

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A codon has a sequence of $\underline {\underline {A}}$, and specifies a particular $\underline {\underline {B}}$ that is to be incorporated into a $\underline {C}$. What are $\underline {A},\underline {B},\underline {C}?$

asked Oct 15, 2013 by meena.p

1 answer

How many tripeptides can be prepared by linking the amino acids glycine, alanine and phenyl alanine?

asked Oct 15, 2013 by meena.p

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What are the chromosome numbers in the following respectively?

asked Oct 15, 2013 by thanvigandhi_1

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What are $\underline {X}$ and $\underline {Y}$ in the following reaction sequence :$C_2H_5OH \longrightarrow \underline{X} \longrightarrow \underline{Y}$

asked Oct 15, 2013 by meena.p

1 answer

IUPAC name of

asked Oct 15, 2013 by thanvigandhi_1

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Which one of the following order is correct for the first ionisation energies of the elements?

asked Oct 15, 2013 by meena.p

0 answers

Match the following :

asked Oct 15, 2013 by meena.p

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pH of a buffer solution decreases by $0.02$ units when $0.12 $ g of acetic acid is added to $250\;ml$ of a buffer solution of acetic acid and Potassium acetate at $27^{\circ}$. The buffer capacity of the solution is :

asked Oct 15, 2013 by meena.p

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How many 'ml' of perhydrol is required to produce sufficient oxygen which can be used to completely convert 2 lit of $SO_2$ gas to $SO_3$ gas?

asked Oct 15, 2013 by meena.p

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The correct Fischer projection formula of (2R, 3R)-2, 3-dihydroxy butanoic acid is

asked Oct 15, 2013 by thanvigandhi_1

1 answer

Assertion (A) : K,Rb and Cs form superoxides. Reason (R): The stability of the superoxides increase from 'K' to 'Cs' due to decrease in lattice energy.

asked Oct 15, 2013 by meena.p

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The average kinetic energy of one molecule of an ideal gas at $27^{\circ}C$ and 1 atm. pressure is :

asked Oct 15, 2013 by meena.p

1 answer

Aluminium reacts with $NaOH$ and forms compound 'X'.If the coordination number of aluminium in $'X'$ is 6, the correct formula of X:

asked Oct 15, 2013 by meena.p

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The number of real solutions of $\tan^{-1}\sqrt{x(x+1)}+\sin^{-1}\sqrt{x^2+x+1}=\large\frac{\pi}{2}$ is

asked Oct 15, 2013 by sreemathi.v

1 answer

$1.5\;g$ of $CdCl_2$ was found to contain $0.9\;g$ of Cd. Calculate the Atomic weight of $Cd.$

asked Oct 15, 2013 by meena.p

1 answer

$SiCl_4$ on hydrolysis forms $'X'$ and HCl. Compound $'X'$ loses water at $1000^{\circ}$ and gives $'Y'$. Compounds $'X'$ and $'Y'$ respectively are :

asked Oct 15, 2013 by meena.p

1 answer

Dipole moment of $HCL=1.03\;D,HI=0.38\;D$. Bond length of $HCL=1.3\; A$ and $HI=1.6 A$. The ratio of fraction of an electric charge, $\delta$, existing on each atom in HCl and HI is :

asked Oct 15, 2013 by meena.p

1 answer

Which one of the following reactions is not correct?

asked Oct 15, 2013 by thanvigandhi_1

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Find $\tan 75^{\large\circ}+\cot 75^{\large\circ}$

asked Oct 15, 2013 by sreemathi.v

1 answer

Which pair of oxyacids of phosphorous contains $'P-H'$ bonds ?

asked Oct 15, 2013 by meena.p

1 answer

In Gattermann reaction, a diazonium group is replaced by $\underline {X}$ using $\underline{Y},X,Y$ are :

asked Oct 15, 2013 by meena.p

1 answer

The type of bonds present in sulphuric anhydride :

asked Oct 15, 2013 by meena.p

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The maximum value of the expression $\large\frac{1}{\sin^2\theta+3\sin\theta\cos\theta+5\cos^2\theta}$ is

asked Oct 15, 2013 by sreemathi.v

1 answer

The chemical entities present in thermosphere of the atmosphere:

asked Oct 15, 2013 by meena.p

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If $\cos(\theta-\alpha)=a$ and $\sin(\theta-\beta)=b$ then $\cos^2(\alpha-\beta)+2ab\sin(\alpha-\beta)$ is equal to

asked Oct 15, 2013 by sreemathi.v

1 answer

If in a $\Delta$ le $ABC,A=\large\frac{\pi}{4}$ and $\tan B\tan C=\alpha$ then the value of $\alpha$ lies in

asked Oct 15, 2013 by sreemathi.v

1 answer

If $n\in N$, then the value of $\displaystyle\sum_{r=0} ^{n} (-1)^r \large\frac{^nC_r}{^{r+2}C_r}$ is

asked Oct 15, 2013 by rvidyagovindarajan_1

1 answer

If $\sqrt{a+b}\tan\large\frac{\theta}{2}$$=\sqrt{a-b}\tan\large\frac{ \phi}{2}$ then $(b-a\sec \theta)(b+a\cos\phi)$ has maximum value $\lambda$ then $\lambda$ is

asked Oct 15, 2013 by sreemathi.v

1 answer

The expression $P(x)$ = $\big(\sqrt {x^5-1}+x\big)^7$ - $\big(\sqrt {x^5-1}-x\big)^7$ is a polynomial of what degree?

asked Oct 15, 2013 by rvidyagovindarajan_1

1 answer

$\cos\large\frac{\pi}{11}$$\cos\large\frac{2\pi}{11}$$\cos\large\frac{3\pi}{11}..........$$\cos\large\frac{11\pi}{11}$ is equal to

asked Oct 15, 2013 by sreemathi.v

1 answer

If $a\cos 2\theta+b\sin 2\theta=c$ has $\alpha$ & $\beta$ as its solutions then $\tan\alpha+\tan\beta$ and $\tan\alpha\tan\beta$ is equal to

asked Oct 15, 2013 by sreemathi.v

1 answer

Let $f(x)=\cos x(\sin x+\sqrt{\sin^2 x+\sin^2\theta})$ where $\theta$ is a given constant then maximum value of $f(x)$ is

asked Oct 15, 2013 by sreemathi.v

1 answer

If $\sin\alpha\sin\beta-\cos\alpha\cos\beta+1=0$ then the value of $\cot\alpha\tan\beta$ is

asked Oct 15, 2013 by sreemathi.v

1 answer

If $\alpha,\beta,\gamma,\delta$ are the solutions of the equation $\tan\big(\theta+\large\frac{\pi}{4}\big)=$$3\tan 3\theta$,no two of which have equal tangents,then the value of $\tan\alpha+\tan\beta+\tan\gamma+\tan\delta$ is equal to

asked Oct 15, 2013 by sreemathi.v

1 answer

If $\cos A=m\cos B$ and $\cot\large\frac{A+B}{2}$$=\lambda\tan\large\frac{B-A}{2}$ then $\lambda$ is

asked Oct 15, 2013 by sreemathi.v

1 answer

If $x\in(\pi,2\pi)$ and $\large\frac{\sqrt{1+\cos x}+\sqrt{1-\cos x}}{\sqrt{1+\cos x}-\sqrt{1-\cos x}}$$=\cot\big(a+\large\frac{x}{2}\big)$ then $'a'$ is equal to

asked Oct 15, 2013 by sreemathi.v

1 answer

$X \: \underleftarrow {HI} $ Glucose $ \underrightarrow {HNO_3}\: Y$

asked Oct 14, 2013 by thanvigandhi_1

1 answer

The temperature coefficient of a reaction is 2.5. If its rate constant at $ T_1K$ is $ 2.5 \times 10^{-3}s^{-1}$, the rate constant at $T_2K$ in $s^{-1}$ is : ( $ T_2 > T_1)$

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Atoms of an element 'A' occupy $ \large\frac{2}{3}$ tetrahedral voids in the hexagonal closed packed ( hcp) unit cell lattice formed by the element 'B' . The formula of the compound formed by 'A' and 'B' is

asked Oct 14, 2013 by thanvigandhi_1

1 answer

Molar conductances of $BaCl_2, H_2SO_4\: and HCl$ at infinite dilution are $X_1,X_2\: and \: X_3$ respectively. Molar conductance of $ BaSO_4$ at infinite dilusion is

asked Oct 14, 2013 by thanvigandhi_1

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