Recent questions tagged 80

A parallel plate capacitor of capacitance $20\mu F$ is being charged by a voltage source whose potential is changing at the rate of $3\frac{ V}{s}$. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively :

asked Jul 8, 2019 by pady_1

1 answer

Cassiterite is concentrated by :

asked Dec 19, 2018 by pady_1

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Which of the following alkane cannot be prepared by Wurtz reaction ?

asked Dec 19, 2018 by pady_1

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

asked Dec 19, 2018 by pady_1

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The metal ion present in vitamin $B_{12}$ is :

asked Dec 11, 2018 by pady_1

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Which of the following ions has the maximum magnetic moment ?

asked Dec 11, 2018 by pady_1

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Glass is a :

asked Dec 11, 2018 by pady_1

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An aqueous solution contains $0.10\; M \;H_2S$ and $0.20\; M \; HCl$. If the equilibrium constant for the formation of $HS^-$ from $H_2S$ is $1.0 \times 10^{-7}$ and that of $S^{2-}$ from $HS^-$ ions is $1.2 \times 10^{-13}$ then the concentration of $S^{2-}$ ions in aqueous solution is :

asked Dec 11, 2018 by pady_1

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3-Methyl-pent-2-ene on reaction with HBr in presence of peroxide forms an addition product. The number of possible stereoisomers for the product is :

asked Dec 11, 2018 by pady_1

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If one of the diameters of the circle, given by the equation, $x^2+y^2−4x+6y−12=0$, is a chord of a circle S, whose centre is at (−3, 2), then the radius of S is :

asked Dec 11, 2018 by pady_1

1 answer

If $y+3x =0$ is the equation of a chord of the circle, $x^2+y^2-30x=0$, then the equation of the circle with this chord as diameter is :

asked Dec 11, 2018 by pady_1

1 answer

Which series of reactions correctly represents chemical reactions related to iron and its compound?

asked Dec 11, 2018 by pady_1

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A hoop of radius r and mass m rotating with an angular velocity $\omega_0$ is placed on a rough horizontal surface. The initial velocity of the centre of the hoop is zero. What will be the velocity of the centre of the hoop when it ceases to slip?

asked Dec 11, 2018 by pady_1

0 answers

For a first order reaction, $(A) \to products$, the concentration of A changes from 0.1 M to 0.025 M in 40 minutes. The rate of reaction when the concentration of A is 0.01 M is :

asked Dec 11, 2018 by pady_1

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The outer electron configuration of Gd (Atomic No:64) is :

asked Dec 11, 2018 by pady_1

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A line AB in three-dimensional space makes angle $45^{\circ}$ and $120^{\circ}$ with the positive $x-axis$ and the positive $y-axis$ respectively. If AB makes an acute $\theta$ with the positive $z-axis$, then $\theta$ equals

asked Dec 11, 2018 by pady_1

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The differential equation which represents the family of curves $y = c_1e^{c_2x}$, where $c_1$ and $c_2$ are arbitrary constants is

asked Nov 29, 2018 by pady_1

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Consider a uniform square plate of side ‘a’ and mass ‘m’. The moment of inertia of this plate about an axis perpendicular to its plane and passing through one of its corners is

asked Nov 29, 2018 by pady_1

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A particle of mass m executes simple harmonic motion with amplitude $a$ and frequency $v$. The average kinetic energy during its motion from the position of equilibrium to the end is :

asked Nov 29, 2018 by pady_1

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The molar conductivities $\bigwedge^{\circ} NaOAc$ and $ \bigwedge^{\circ} HCl$ at infinite dilution in water at $25^{\circ}C$ are $91.0$ and $426.2\; S\; cm^2/mol$ respectively. To calculate $ \bigwedge^{\circ} HOAc$, the additional value required is :

asked Nov 13, 2018 by pady_1

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If $\alpha$ is the degree of dissociation of $Na_2SO_4$, the van't Hoff factor ($i$) used for calculating the molecular mass is :

asked Nov 5, 2018 by pady_1

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The correct order of bond angles (smallest first) in $H_2S, \; NH_3, \; BF_3$ and $SiH_4$ is

asked Nov 5, 2018 by pady_1

1 answer

Match the metal ions given in Column I and the spin magnetic moments of the ions given in Column II and assign the correct code : <br>

asked Aug 21, 2018 by pady_1

1 answer

Which statements is wrong for Krebs' cycle?

asked Aug 21, 2018 by pady_1

1 answer

Which of the following statements is wrong for viroids ?

asked Aug 21, 2018 by pady_1

1 answer

Grafted kidney may be rejected in a patient due to -

asked Aug 21, 2018 by pady_1

1 answer

Which one of the following is an example of a thermosetting polymer?

asked Aug 20, 2018 by pady_1

1 answer

Nylon is an example of-

asked Aug 20, 2018 by pady_1

1 answer

Identity the wrong statement in the following

asked Aug 20, 2018 by pady_1

1 answer

The complex $[Pt\; (Py)\; (NH_3)\; Br\; Cl]$ will have how many geometrical isomers ?

asked Aug 16, 2018 by pady_1

1 answer

25.3 g of sodium carbonate, $Na_2CO_3$ is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, $Na^+$ and carbonate ions,$CO_3^{2-}$ are respectively (Molar mass of $Na_2CO^3$ = 106 g mol–1)

asked Jul 26, 2018 by pady_1

1 answer

Which of the following does not show optical isomerism - <br> (en = Ethylenediamine)

asked Jul 26, 2018 by pady_1

1 answer

Percentage of free space in a body centered cubic unit cell is -

asked Jul 26, 2018 by pady_1

1 answer

Identify the incorrect statement among the following:

asked Jul 26, 2018 by pady_1

1 answer

$[Cr(H_2O_2)_6]Cl_3$ (at. No. of Cr = 24) has a magnetic moment of 3.83 B.M. The correct distribution of 3d electrons in the Chromium of the complex is:-

asked Jul 25, 2018 by pady_1

0 answers

The correct order in which the O-O bond length increases in the following is :-

asked Jul 24, 2018 by pady_1

1 answer

In a regular octahedral molecule, $MX_6$ the number of X–M–X bonds at 180º is :-

asked Jul 24, 2018 by pady_1

1 answer

According to the adsorption theory of catalysis, the speed of the reaction increase because :

asked Jul 24, 2018 by pady_1

1 answer

In the silver plating of copper, $K[Ag(CN)_2]$ is used instead of $AgNO_3$. The reason is : -

asked Jul 23, 2018 by pady_1

1 answer

$PbO_2 \to PbO \; \; \; \; \; \Delta G_{298} < 0$ <br> $SnO_2 \to SnO \; \; \; \; \; \Delta G_{298} > 0$ Most probable oxidation state of Pb & Sn will be :

asked Jul 20, 2018 by pady_1

1 answer

Correct order of dissociation energy of $N_2$ and $N{ _2^+}$ is :

asked Jul 20, 2018 by pady_1

1 answer

First ionization potential of Be and B will be :

asked Jun 15, 2018 by pady_1

1 answer

, In 2008 approximately what percent of the world's population lived in Asia?

asked Dec 31, 2015 by pady_1

0 answers

Find the area of a square of side 13 cm.

asked Dec 31, 2015 by pady_1

1 answer

Seth invested a certain amount of money and got back an amount of \$ 8400. If the bank paid an interest of \$ 700, find the amount Sam invested.

asked Dec 31, 2015 by pady_1

1 answer

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