Recent questions tagged 77

Two parallel infinite line charges with linear charge densities$\lambda +\frac{C}{m} \;and \;-\lambda \frac{C}{m}$ are placed at a distance of 2R in free space. What is the electric field midway between two line charges?

asked Jul 8, 2019 by pady_1

1 answer

Which one of the following reactions does not yield an alkyl halide ?

asked Dec 19, 2018 by pady_1

0 answers

$\Delta x$ = (Hydration energy) - (Lattice energy), for a salt $\Delta x$ is found to be $500\;kcal\;mol^{-1}$. Then on increasing the temperature, its solubility in water :

asked Dec 19, 2018 by pady_1

0 answers

Which of the following is used in the preparation of generated water (soda) ?

asked Dec 19, 2018 by pady_1

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When acetaldehyde is reacted with $LiAlH_4$, whar is the product formed ?

asked Dec 11, 2018 by pady_1

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For an ideal gas, number of mol per litre in terms of its pressure P, temperature T and gas constant R is :

asked Dec 11, 2018 by pady_1

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The de-Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 m/s is approximately : (Plancks constant, $h =6.63 \times 10^{-34} Js$)

asked Dec 11, 2018 by pady_1

0 answers

An aqueous solution contains an unknown concentration of $Ba^{2+}$. When $50\; mL$ of the $1M$ solution of $Na_2SO_4$ is added, $BaSO_4$ just begins to precipitate. The final volume is $500\; mL$. The solubility product of $BaSO_4$ is $1 \times 10^{-10}$. What is the original concentration of $Ba^{2+}$.

asked Dec 11, 2018 by pady_1

0 answers

The correct sequence of reagents for the following conversion will be :

asked Dec 11, 2018 by pady_1

0 answers

If a curve $y = f(x)$ passes through the point $(1, -1)$ and satifies the differential equation, $y(1+xy) dx = x ;dy$, then $f(-\frac{1}{2})$ is equal to :

asked Dec 11, 2018 by pady_1

1 answer

If $y(x)$ is the solution of the differential equation $(x+2) \frac{dy}{dx} = x^2+4x-9,\; x \neq -2$ and $y(0)=0$, then $y(-4)$ is equal to :

asked Dec 11, 2018 by pady_1

1 answer

The equation which is balanced and represents the correct product(s) is:

asked Dec 11, 2018 by pady_1

0 answers

What is the minimum energy required to launch a satellite of mass m from the surface of a planet of mass M and radius R in a circular orbit at an altitude of 2R?

asked Dec 11, 2018 by pady_1

0 answers

How many chiral compounds are possible on monochlorination of 2-methyl butane ?

asked Dec 11, 2018 by pady_1

0 answers

In context of the lanthanoids, which of the following statements is not correct ?

asked Dec 11, 2018 by pady_1

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For a regular polygon, let $r$ and $R$ be the radii of the inscribed and the circumscribed circles. A false statement among the following is

asked Dec 11, 2018 by pady_1

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The remainder left out when $8^{2n} - (62)^{2n+1}$ is divided by 9 is

asked Nov 29, 2018 by pady_1

0 answers

A thin rod of length ‘L’ is lying along the x-axis with its ends at x = 0 and x = L. Its linear density x a(mass/length) varies with X as $K[\frac{X}{L}]$,where n can be zero or any positive number. If the position $X_{CM}$ of the centre of mass of the rod is plotted against ‘n’, which of the following graphs best approximates the dependence of $X_{CM}$ on n?

asked Nov 29, 2018 by pady_1

0 answers

In a Young's double slit experiment the intensity at a point where the path difference is $\frac{\lambda}{6}$ ($\lambda$ being the wavelength of the light used) is $I$. If $I_0$ denotes the maximum intensity, $I/ I_0$ is equal to :

asked Nov 29, 2018 by pady_1

0 answers

Fluorobenzene $(C_6H_5F)$ can be synthesized in the laboratory :

asked Nov 13, 2018 by pady_1

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Which one of the following types of drugs reduces fever ?

asked Nov 5, 2018 by pady_1

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Consider the ground state of Cr atom (Z = 24). The number of electrons with the azimuthal quantum numbers $l = 1$ and $2$ are respectively

asked Nov 5, 2018 by pady_1

1 answer

In the reaction The electrophile involved is

asked Aug 21, 2018 by pady_1

1 answer

Which of the following facilitates opening of stomatal aperture ?

asked Aug 21, 2018 by pady_1

1 answer

Which of the following most appropriately describes haemophilia ?

asked Aug 21, 2018 by pady_1

1 answer

Arrange the following events of meiosis in correct sequence - (a) Crossing over (b) Synapsis (c) Terminalisation of chiasmata (d) Diappearance of nucleolus

asked Aug 21, 2018 by pady_1

1 answer

Which of the following will be most stable diazonium salt $RN_2^+X^-$?

asked Aug 20, 2018 by pady_1

1 answer

Which one of the following molecules contains no $\pi$ bond ?

asked Aug 20, 2018 by pady_1

1 answer

Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest pH value ?:

asked Aug 20, 2018 by pady_1

1 answer

Which of the following elements is present as the impurity to the maximum extent in the pig iron ?

asked Aug 16, 2018 by pady_1

1 answer

Which of the following statements about primary amines is 'False'?

asked Jul 26, 2018 by pady_1

1 answer

What is the dominant intermolecular force or bond that must be overcome in converting liquid $CH_3$ OH to a gas -

asked Jul 26, 2018 by pady_1

1 answer

For the gas phase reaction, $PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2(g)$ Which of the following conditions are correct ?

asked Jul 26, 2018 by pady_1

1 answer

Which one of the following anions is present in the chain structure of silicates:

asked Jul 26, 2018 by pady_1

1 answer

Consider the reaction $N_2(g)+3H_2(g)\to2NH_3(g)$ The equality relationship between $\frac{d[NH_3]}{dt}$ and $\frac{-d[H_2]}{dt}$is :-

asked Jul 25, 2018 by pady_1

0 answers

The monomer of the polymer

asked Jul 24, 2018 by pady_1

0 answers

Reaction of HBr with propene in the presence of peroxide gives :-

asked Jul 24, 2018 by pady_1

1 answer

In a set of th given reaction, acetic acid yielded a product C. $CH_3COOH +PCl_5 \to A \xrightarrow[\text{Anh. $AlCl_3$}]{\text{$C_6H_6$}} B \xrightarrow[\text{ether}]{\text{$C_2H_5MgBr$} } C \; \text{, product C would be }$

asked Jul 24, 2018 by pady_1

0 answers

Which of the following shows maximum number of oxidation states :-

asked Jul 23, 2018 by pady_1

1 answer

Pure water can be obtain from sea water by

asked Jul 20, 2018 by pady_1

1 answer

Which statement is wrong :

asked Jul 20, 2018 by pady_1

1 answer

$_nX^m$ emitted one $\alpha$ and $2\beta$ particles, then it will become :

asked Jun 15, 2018 by pady_1

1 answer

Find the odd one out

asked Dec 31, 2015 by pady_1

1 answer

Tammy recorded the amount of time she spent on six activities over a twenty four hour period and drew a bar graph, as follows: , Approximately how many more hours did she spend sleeping than watching TV?

asked Dec 31, 2015 by pady_1

1 answer

Calculate the area of a square patch of grass of side 21 cm.

asked Dec 31, 2015 by pady_1

1 answer

Hung's lemon cookie recipe calls for $\large\frac{1}{4}$ of a cup of sugar. How much sugar would Hung use to make $\large\frac{1}{4}$ of a batch of cookies?

asked Dec 31, 2015 by pady_1

1 answer

If a chair was sold for \$ 990 at a loss of \$ 110. Find the cost price of the chair.

asked Dec 31, 2015 by pady_1

0 answers

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