Recent questions tagged 63

A body weighs 200 N on the surface of the earth.How much will it weigh half way down to the centre of the earth ?

asked Jul 8, 2019 by pady_1

1 answer

$Be^{2+}$ is isoelectronic with :

asked Dec 19, 2018 by pady_1

0 answers

What is the numerical value of the gas constant $R$ in $J\; mol^{-1}K^{-1} $ ?

asked Dec 19, 2018 by pady_1

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What is the catalyst used in the manufacture of sulphuric acid by contact process ?

asked Dec 19, 2018 by pady_1

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Which one of the following halogen liberated oxygen, when passed through hot concentrated KOH solution ?

asked Dec 11, 2018 by pady_1

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1 mole of a gas with $\gamma = 7/5$ is mixed with 1 mole of a gas with $\gamma = 5/3$, then the value of $\gamma$ for the resulting mixture is :

asked Dec 11, 2018 by pady_1

0 answers

The wavelengths involved in the spectrum of deuterium $(_1^2D)$ are slightly different from that of hydrogen spectrum, because :

asked Dec 11, 2018 by pady_1

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Phenol reacts with methyl chloroformate in the presence at $NaOH$ to form product A. A reacts with $Br_4$ to form product B. A and B respectively

asked Dec 11, 2018 by pady_1

0 answers

The freezing point of benzene decreases by $0.45^{\circ}C$ when $0.2\; g$ of acetic acid is added to $20 \;g$ of benzene. If acetic acid associates to form a dimer in benzene, percentage association of acetic acid in benzene will be : $(K_f$ for benzene = $5.12\; K \;kg\; mol^{–1} )$

asked Dec 11, 2018 by pady_1

0 answers

The sum of all real values of $x$ satisfying the equation <br> $(x^2 - 5x + 5)^{x^2 + 4x - 60} = 1$ is :

asked Dec 11, 2018 by pady_1

1 answer

If $2 + 3i$ is one of the roots of the equation $2x^3 - 9x^2 + kx - 13 = 0, \; k \in R$, then the real root of this equation :

asked Dec 11, 2018 by pady_1

1 answer

The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is:

asked Dec 11, 2018 by pady_1

0 answers

The supply voltage to a room is 120 V. The resistance of the lead wires is 6 $\Omega$. A 60 W bulb is already switched on. What is the decrease of voltage across the bulb, when a 240 W heater is switched on in parallel to the bulb?

asked Dec 11, 2018 by pady_1

0 answers

Lithium forms body centred cubic structure. The length of the side of its unit cell is 351 pm. Atomic radius of the lithium will be :

asked Dec 11, 2018 by pady_1

0 answers

Trichloroacetaldehyde was subjected to Cannizzaro's reaction by using NaOH. The mixture of the products contains sodium trichloroacetate and another compound. The other compound is :

asked Dec 11, 2018 by pady_1

0 answers

Let $\overrightarrow{a} = \hat{j} - \hat{k}$ and $\overrightarrow{c} = \hat{i} - \hat{j} - \hat{k}$. Then vector $\overrightarrow{b}$ satisfying $\overrightarrow{a} \times \overrightarrow{b} + \overrightarrow{c} = \overrightarrow{0}$ and $\overrightarrow{a}.\overrightarrow{b} = 3$ is

asked Dec 11, 2018 by pady_1

0 answers

If the roots of the equation $bx^2 + cx + a = 0$ be imaginary, then for all real values of $x$, the expression $3b^2x^2 + 6bcx+2c^2$ is

asked Nov 29, 2018 by pady_1

0 answers

Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is

asked Nov 29, 2018 by pady_1

0 answers

Two lenses of power -15D and +5D are in contact with each other. The focal length of the combination is :

asked Nov 29, 2018 by pady_1

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A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with everything else kept the same, the rate of reaction will :

asked Nov 13, 2018 by pady_1

0 answers

Let $a, b$ and $c$ be distinct non-negative numbers. If the vectors $a \hat{i} + a \hat{j} + c \hat{k}, \hat{i} + \hat{k}$ and $c \hat{i} + c \hat{j} + b \hat{k}$ lie in a plane, then $c$ is :

asked Nov 5, 2018 by pady_1

0 answers

An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. What is the percentage increase in the apparent frequency ?

asked Nov 5, 2018 by pady_1

0 answers

Let $\overline{u}, \; \overline{v},\; \overline{w}$ be such that $|\overline{u}| = 1, \; |\overline{v}|=2, \; |\overline{w}|=3$ If the projection $\overline{v}$ along $\overline{u}$ is equal to that of $\overline{w}$ along $\overline{u}$ and $\overline{v}\; , \overline{w}$ are perpendicular to each other then $|\overline{u} - \overline{v} + \overline{w}|$ equals

asked Nov 5, 2018 by pady_1

0 answers

The correct difference between first and second order reactions is that

asked Aug 21, 2018 by pady_1

1 answer

Plants which produce characteristic pneumatophores and show vivipary belong to :

asked Aug 21, 2018 by pady_1

1 answer

Select the correct statement

asked Aug 21, 2018 by pady_1

1 answer

The term "linkage" was coined by -

asked Aug 21, 2018 by pady_1

1 answer

The pair of compounds that can exist together is:

asked Aug 20, 2018 by pady_1

1 answer

Which of the following structure is similar to graphite ?

asked Aug 20, 2018 by pady_1

1 answer

The protecting power of lyophilic colloidal sol is expressed in term of

asked Aug 20, 2018 by pady_1

1 answer

A gaseous mixture was prepared by taking equal mole of $CO$ and $N_2$. If the total pressure of the mixture was found 1 atmosphere, the partial pressure of the nitrogen $(N_2)$ in the mixture is :

asked Aug 16, 2018 by pady_1

1 answer

For an endothermic reaction, energy of activation is $E_a$ and enthalpy of reaction is $\delta H$ (both of these in kJ/mol). Minimum value of Ea will be:

asked Jul 26, 2018 by pady_1

1 answer

A 0.0020 M aqueous solution of an ionic compound $Co(NH_3)_5(NO_2)Cl $ freezes at $- 0.00732^ºC$. Number of moles of ions which 1 mole of ionic compound produces on being dissolved in water will be : ($k_f = 1.86^ºC/m$)

asked Jul 26, 2018 by pady_1

0 answers

If uncertainty in position and momentum are equal, then uncertainty in velocity is -

asked Jul 26, 2018 by pady_1

1 answer

Given that bond energies of $H-H$ and $Cl-Cl$ are 430 $kJ mol^{-1}$ and 240 $kJ mol^{-1}$ respectively and $\Delta_f H$ for $HCl$ is -90 $kJ mol^{-1}$. Bond enthalpy of $HCl$ is :

asked Jul 26, 2018 by pady_1

1 answer

$Al_2 O_3$ can be converted to anhydrous $AlCl_3$ by heating:-

asked Jul 25, 2018 by pady_1

0 answers

The vapour pressure of two liquids 'P' and 'Q' are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and 2 mole of Q would be :-

asked Jul 24, 2018 by pady_1

1 answer

Which one of the following structures represents the peptide chain :-

asked Jul 24, 2018 by pady_1

1 answer

Which of the following statements is not true :

asked Jul 24, 2018 by pady_1

1 answer

$3A\rightarrow 2B$, rate of reaction $\frac{+d[B]}{dt}$ is equals to : -

asked Jul 23, 2018 by pady_1

1 answer

Which of the following is correct about H- bonding in nucleotide :-

asked Jul 20, 2018 by pady_1

1 answer

Dihedral angle in staggered form of ethane is :

asked Jul 20, 2018 by pady_1

1 answer

Which of the following does not give nucleophilic substitution with alcohol :

asked Jun 15, 2018 by pady_1

1 answer

Cube is related to Square in the same way as Square is related to

asked Dec 31, 2015 by pady_1

1 answer

Type the missing number in this sequence: 2, ------, 32, 128, 512, 2,048

asked Dec 31, 2015 by pady_1

0 answers

The perimeter of a rectangular lawn is 88 metres. It is 29 metres long. How wide is it?

asked Dec 31, 2015 by pady_1

0 answers

$\large\frac{3}{5}$ of a class of 45 are boys. Find the number of girls in the class.

asked Dec 31, 2015 by pady_1

0 answers

The canteen wants to buy 7,329 new forks. If each package contains 7 forks, how many packages should the canteen buy?

asked Dec 31, 2015 by pady_1

0 answers

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