Recent questions tagged medium

A vessel of volume 5 litre contains 1.4g of nitrogen at temperature 1800K. Find the pressure of the gas if $30\%$ of its molecules are dissociated into atoms at this temperature.

asked Feb 20, 2014 by sharmaaparna1

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An evacuated glass vessel weighs 50.0g when empty 148.0 g when filled with a liquid of density $0.98gmL^{-1}$ and 50.5g when filled with an ideal gas at 760mm Hg of 300K.Determine the molecular weight of the gas.

asked Feb 20, 2014 by sharmaaparna1

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The Volume of the average adult lung when expanded is about $6L$ at $98.4^{\large\circ}F$. If the pressure of oxygen in inhaled air is $168mm$ of $Hg$ , calculate the mass of $O_2$ required to occupy the lung at $98.4^{\large\circ}F$.

asked Feb 20, 2014 by sharmaaparna1

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Molecule in which the distance between the two adjacent carbon atoms is large is

asked Feb 20, 2014 by meena.p

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If the sum of certain number of terms of the A.P., $25,22,19................$ is $116$, then find the last term.

asked Feb 20, 2014 by rvidyagovindarajan_1

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In an $A.P.$ if $p^{th}$ term is $\large\frac{1}{q}$ and $q^{th}$ term is $\large\frac{1}{p}$, then prove that the sum of first $pq$ terms is $\large\frac{1}{2}$$(pq+1)$ where $p\neq q$

asked Feb 20, 2014 by rvidyagovindarajan_1

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How many terms of the A.P. $-6,-\large\frac{11}{2}$$, -5........$ are needed to give the sum $-25$

asked Feb 20, 2014 by rvidyagovindarajan_1

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Which reagent would you use to accomplish this transformation?

asked Feb 20, 2014 by sreemathi.v

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What is the most likely result of the reaction conditions shown?

asked Feb 20, 2014 by sreemathi.v

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Complete the following reaction by filling in the necessary reagents.

asked Feb 20, 2014 by sreemathi.v

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Which of the following will not show tautomerism?

asked Feb 20, 2014 by sreemathi.v

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What is the correct name of the following molecule?

asked Feb 20, 2014 by sreemathi.v

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Predict the product in the following : $CH_3CHO+4HCHO\quad\underrightarrow{\text{Conc aq NaOH}}$

asked Feb 20, 2014 by sreemathi.v

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What would be the product of the following reaction?

asked Feb 20, 2014 by sreemathi.v

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In the following reaction what is X?

asked Feb 20, 2014 by sreemathi.v

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What is X in the following reaction?

asked Feb 20, 2014 by sreemathi.v

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What is X in the below reaction?

asked Feb 20, 2014 by sreemathi.v

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Two glass bulbs with equal volume are connected by a narrow tube and filled with a gas at $0^{\large\circ}C$ and pressure of $76\;cm\; Hg$ . One of the bulb is then placed in a water bath maintained at $62^{\large\circ}C$. What is the new value of the pressure inside the bulbs? The volume of the connecting tube is negligible.

asked Feb 20, 2014 by sharmaaparna1

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Select the molecule which has only one $\pi$-bond

asked Feb 20, 2014 by sreemathi.v

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1.47 litre of a gas is collected over water at $30^{\large\circ}C$ and 744mm of Hg . If the gas weight 1.98g and vapour pressure of water at $30^{\large\circ}C$ is 32mm , What is the molecular weight of gas?

asked Feb 20, 2014 by sharmaaparna1

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The decreasing order of $K_{eq}$ values in HCN addition to following aldehydes is

asked Feb 20, 2014 by sreemathi.v

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A monoatomic ideal gas undergoes a process in which the ratio of P to V at any instant is constant and equal to unity. The molar heat capacity of gas is:

asked Feb 20, 2014 by sharmaaparna1

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In Victor Mayers experiment 0.23g of a volatile solute displaced air which measures 112mL at NTP .Calculate the vapour density and molecular weight of substance

asked Feb 20, 2014 by sharmaaparna1

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Predict the product in the following reaction

asked Feb 20, 2014 by sreemathi.v

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3.7 g of a gas at $25^{\large\circ}C$ occupy the same volume as 0.184g of $H_2$ at $17^{\large\circ}C$ at same pressure. What is moleculer weight of gas?

asked Feb 20, 2014 by sharmaaparna1

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Which of the following will be a best hydride donor?

asked Feb 20, 2014 by sreemathi.v

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In YDSE intensity at a point is $\bigg (\large\frac{1}{4} \bigg) $ of maximum intensity. Angular position of this point is :

asked Feb 20, 2014 by meena.p

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The cannizzaro reaction is given below :

asked Feb 20, 2014 by sreemathi.v

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In YDSE if the source consists of two wave lengths $\lambda_1=4000 \;a^{\circ}$ and $\lambda _2 =4002\;A^{\circ}$ . Find the distance from centre where fringes disappear if $d= 1\;cm; D=1\;m$

asked Feb 20, 2014 by meena.p

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Predict the product in the following reaction

asked Feb 20, 2014 by sreemathi.v

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A typical compound under goes Cannizzaro's reaction as well as aldol condensation.The possible compound is

asked Feb 20, 2014 by sreemathi.v

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The below reduction reaction is known as

asked Feb 20, 2014 by sreemathi.v

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Benzaldehyde differs from acetaldehyde in that

asked Feb 20, 2014 by sreemathi.v

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The ratio of the magnetic field at the centre of a current carrying coil to its magnetic moment is $ x$. If the current and the radius are both doubled, the new ratio will become

asked Feb 19, 2014 by thanvigandhi_1

1 answer

In the YDSE apparatus shown the ratio of maximum to minimum intensity on screen is 9. The wavelength of light used is $\lambda$, the value of y is :

asked Feb 19, 2014 by meena.p

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In an $A.P.$ the first term is $2$ and the sum of first $5$ terms is one-fourth of the next five terms. Find its $20^{th}$ term.

asked Feb 19, 2014 by rvidyagovindarajan_1

1 answer

An object is placed at $ A\;(OA > f)$ Here, f is the focal length of the lens. The image is formed at B, A perpendicular is erected at 0 and C is chooses such that $\angle BCA =90^{\circ}$. Let $OA=a,OB=b$ and $OC=c$ then f is :

asked Feb 19, 2014 by meena.p

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A charged particle enters a magnetic field with the velocity vector making a $45^{\circ}$ magnetic field. If the pitch of the helical path followed by the particle is $\wp$, its radius will be angle with the

asked Feb 19, 2014 by thanvigandhi_1

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A point object O is placed at a distance o 20cm from a convex lens of focal 10 cm as shown. At what distance x from lens should a concave mirror of focal length 60 cm can be placed so that final image coincides with object.

asked Feb 19, 2014 by meena.p

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Net magnetic field at the centre of the circle $O$ due to a current carrying loop as shown in the figure for $ \theta < 180^{\circ}$ is

asked Feb 19, 2014 by thanvigandhi_1

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The dimensions of magnetic flux are

asked Feb 19, 2014 by thanvigandhi_1

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Optic axis of a thin equiconvex lens is the x-axis. The co-ordinates of a point object and its image are $(-40\;cm,1\;cm)$ and $(50\;cm,-2\;cm)$ respectively . lens is located at

asked Feb 19, 2014 by meena.p

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A concave mirror has a focal length 20 cm. The distance between the two positions of object for which the image size is double of object size.

asked Feb 19, 2014 by meena.p

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A convex lens forms a real image 3 times larger than the object on a screen. Object and screen are moved until the image becomes twice the size of object. If the shift of object is $6\;cm$ The shift of screen is :

asked Feb 19, 2014 by meena.p

1 answer

In YDSE $\large\frac{d}{D}$$=10^4$ (d= distance between slits ; D= distance of screen from slits). at a point P on screen resulting intensity is equal to intensity due to individual slit $I_0$ Then the distance of point P from central maximum is $(\lambda= 6000 A^{\circ})$

asked Feb 19, 2014 by meena.p

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Refraction takes place at a concave spherical boundary separating glass air medium. For image to be real the object distance $(\mu g=\large\frac{3}{2})$

asked Feb 19, 2014 by meena.p

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A large metal sheet carries an electric current along its surface with $ \lambda$ being the current per unit length. The value of the magnetic field near the surface of the sheet is

asked Feb 19, 2014 by thanvigandhi_1

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There exists uniform electric and magnetic fields in space. A particle is moving with a velocity $ \overrightarrow v$ and suddenly a hollow metallic cube is enclosed around it. The change in force exerted on the particle is

asked Feb 19, 2014 by thanvigandhi_1

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Two parallel wires carrying equal currents in the opposite directions are placed at $x = \pm$ a parallel to the $y$-axis with $z = 0$. Magnetic field at origin $O$ is $B1$ and at $P (2a,0,0)$ is $B2$. Then the ratio $ \large\frac{B1}{B2}$ is

asked Feb 19, 2014 by thanvigandhi_1

1 answer

A wire of length $1m$ is placed in $x-z$ plane carries a current of $1A$. The coefficient of friction between the wire and the surface is $0.2$ and the mass of the wire is $2\; Kg$. The magnetic field of strength $2T$ exists along positive $y$ direction. Then which of the following is correct

asked Feb 19, 2014 by thanvigandhi_1

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