Recent questions tagged 62

In an experiment, the percentage of error occurred in the measurment of physical quantities A, B, C and D are 1%, 2%, 3% and 4% respectively. Then the maximum percentage of error in the measurement X, where $X=\frac{A^2B^\frac{1}{2}}{C^\frac{1}{3}D^3}$, will be

asked Jul 8, 2019 by pady_1

1 answer

Reaction of benzene with alkyl halide in the presence of anhydrous $AlCl_3$ is called :

asked Dec 19, 2018 by pady_1

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The molecule having zero dipole moment is :

asked Dec 19, 2018 by pady_1

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What are the values of $n_1$ and $n_2$ for the 2nd line in the Lyman series of hydrogen atomic spectrum ?

asked Dec 19, 2018 by pady_1

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Which one of the following order is correct for the bond energies of halogen molecules ?

asked Dec 11, 2018 by pady_1

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Speeds of two identical cars are $u$ and $4u$ at a specific instant. The ratio of the respective distances at which the two cars are stopped from that instant is :

asked Dec 11, 2018 by pady_1

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Which of the following atoms has the lowest ionization potential ?

asked Dec 11, 2018 by pady_1

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Which of the following salts is the most basic in aqueous solution ?

asked Dec 11, 2018 by pady_1

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Given : $C_(graphite) + O_2(g) \to CO_2 (g) ; \; \; \; \; \Delta_r H^{\circ} = -393.5\; kJ \; mol^{-1};$ $H_2(g) + \frac{1}{2}O_2(g) \to H_2O(l); \;\;\;\; \; \; \; \; \Delta_rH^{\circ} = -285.8 \; kJ\; mol^{-1};$ $CO_2(g) + 2 H_2O (l) \to CH_4(g) + 2O_2 (g); \; \; \; \; \Delta_r H^{\circ} = + 890.3 \;kJ\; mol^{-1}$ Based on the above thermochemical equations, the value of $\Delta_r H^{\circ}$ at 298 K for the reaction

asked Dec 11, 2018 by pady_1

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A value of $\theta$ for which $\frac{2 + 3 i \sin \theta}{1 - 2 i \sin \theta}$ is purely imaginary, is :

asked Dec 11, 2018 by pady_1

1 answer

The largest value of $r$ for which the region represented by the set $\{ \omega \in C | \omega - 4 - i | \leq r \}$ is contained in the region represented by the set $\{z \in C / |z-1| \leq |z+i| \}$, is equal to :

asked Dec 11, 2018 by pady_1

1 answer

If Z is a compressibility factor, van der Waals equation at low pressure can be written as:

asked Dec 11, 2018 by pady_1

0 answers

A diode detector is used to detect an amplitude modulated wave of 60% modulation by using a condenser of capacity 250 pico farad in parallel with a load resistance 100 kilo ohm. Find the maximum modulated frequency which could be detected by it.

asked Dec 11, 2018 by pady_1

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Which method of purification is represented by the following equation : $Ti(s) + 2I_2 (g) \xrightarrow{523 K} TiI_4 (g) \xrightarrow{1700 K} Ti(s) + 2I_2 (g)$

asked Dec 11, 2018 by pady_1

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The presence or absence of hydroxyl group on which carbon atom of sugar differentiates RNA and DNA ?

asked Dec 11, 2018 by pady_1

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Let S be a non-empty subset of R. Consider the following statement : P : There is a rational number $x \in S$ such that $x > 0$. Which of the following statements is the negation of the statement P ?

asked Dec 11, 2018 by pady_1

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If the mean deviation of number $1, 1+d, 1 +2d, . . . ., 1 + 100d$ from their mean is 255, then the $d$ is equal to

asked Nov 29, 2018 by pady_1

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The vapour pressure of water at $20^oC$ is 17.5 mm Hg. If 18 g of glucose $(C_6H_{12}O_6)$ is added to 178.2 g of water at $20^oC$, the vapour pressure of the resulting solution will be

asked Nov 29, 2018 by pady_1

0 answers

A block of mass m is connected to another block of mass M by a spring (massless) of spring constant k. The blocks are kept on a smooth horizontal plane. Initially the blocks are at rest and the spring is unstretched. Then a constant force F starts acting on the block of mass M to pull it. Find the force on the block of mass m.

asked Nov 29, 2018 by pady_1

1 answer

Total volume of atoms present in a face-centred cubic unit cell of a metal is (r is atomic radius) :

asked Nov 13, 2018 by pady_1

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Let $\overrightarrow{a} = \hat{i} - \hat{k}, \; \overrightarrow{b} = x \hat{i} + \hat{j} + (1-x) \hat{k}$ and $\overrightarrow{c} = y \hat{i} +x \hat{j} + (1+x -y) \hat{k}$. Then $[\overrightarrow{a} \overrightarrow{b} \overrightarrow{c}]$ depends on :

asked Nov 5, 2018 by pady_1

0 answers

The bob of a simple pendulum is a spherical hollow ball filled with water. A plugged hole near the bottom of the oscillating bob gets suddenly unplugged. During observation, till water is coming out, the time period of oscillation would :

asked Nov 5, 2018 by pady_1

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If $\overline{a}, \overline{b}, \overline{c}$ are non-coplanar vectors and $\lambda$ is a real number, then the vectors $\overline{a} + 2 \overline{b} + 3 \overline{c}, \; \lambda \overline{b} + 4 \overline {c}$ and $(2 \lambda -1) \overline{c}$ are non-coplanar for

asked Nov 5, 2018 by pady_1

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In which case in number of molecules of water maximum ?

asked Aug 21, 2018 by pady_1

1 answer

A dioecious flowering plant prevents both :

asked Aug 21, 2018 by pady_1

1 answer

Emerson's enhancement effect and Red drop have been instrumental in the discovery of

asked Aug 21, 2018 by pady_1

1 answer

Cell wall is absent in -

asked Aug 21, 2018 by pady_1

1 answer

1.0 g of magnesium is burnt with 0.56 g $O_2$ in a closed vessel. Which reaction is left in excess and how much? (At, wt.Mg = 24; O = 16)

asked Aug 20, 2018 by pady_1

1 answer

Which of the following is paramagnetic ?

asked Aug 20, 2018 by pady_1

1 answer

$P_A$ and $P_B$ are the vapour pressure of pure liquid components, A and B, respectively of an ideal binary solution. If $X_A$ represents the mole fraction of component A, the total pressure of the solution will be:

asked Aug 20, 2018 by pady_1

1 answer

Standard electrode potential for $Sn^{4+}/Sn^{2+}$ couple is $+0.15 V$ and that for the $Cr^{3+}/ Cr$ couple is $–0.74 V$. These two couples in their standard state are connected to make a cell. The cell potential will be :

asked Aug 16, 2018 by pady_1

1 answer

What is in mol/L of a solution that is 0.20 M in $CH_3COONa$ and 0.10 M in $CH_3COOH$ Ka for $CH_3COOH=1.8\times10^-5$

asked Jul 26, 2018 by pady_1

0 answers

The equivalent conductance of $\frac {M}{32}$ solution of a weak monobasic acid is 8.0 mho $cm ^2$ and at infinite dilution is 400 mho $cm ^2$, The dissociation constant of this acid is -

asked Jul 26, 2018 by pady_1

0 answers

The sequence of ionic mobility in aqueous solutions is -

asked Jul 26, 2018 by pady_1

1 answer

Consider the following reactions : $(a) \; H^+_{(aq)} + OH^- _{(aq)} = H_2O_{(l)}, \Delta H = -X_1kJ\; mol^{-1}$ $(b)\; H_{2(g)} + \frac{1}{2} O_{2(g)} = H_2O_{(l)}, \Delta H = -X_2 kJ mol^{-1} $ $(c)\; CO_{2(g)} + H_{2(g)} = CO_{(g)} + H_2O_{(l)} -X_3 kJ mol^{-1}$ $(d)\; C_2H_{2(g)} + \frac{5}{2} O_{2(g)} = 2CO_{2(g)} + H_2O_{(l)} +X_4 kJ mol^{-1}$ Enthalpy of formation of $H_2O_{(l)} $ is:

asked Jul 26, 2018 by pady_1

1 answer

In which of the following pairs are both the ions coloured in aqueous solution- [At. No. : Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27]

asked Jul 25, 2018 by pady_1

0 answers

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species :-

asked Jul 24, 2018 by pady_1

1 answer

The rate of a first order reaction is $1.5\times 10^{-2} mol L^{-1} min^ {–1}$at 0.5 M concentration of the reactant. The half life of the reaction is :-

asked Jul 24, 2018 by pady_1

1 answer

The activation energy for a simple chemical reaction $A \to B$ is $E_a$ in forward direction. The activation energy for reverse reaction :

asked Jul 24, 2018 by pady_1

1 answer

Heat of combustion $\bigtriangleup H^o$ for C(s), $H_2(g)$ and $CH_4 (g)$ are – 94, – 68 and – 213 Kcal/mol. then $\bigtriangleup H^o for C(s)+2H_2(g)\rightarrow CH_4(g)$ is : -

asked Jul 23, 2018 by pady_1

1 answer

Which of following is correct :-

asked Jul 20, 2018 by pady_1

1 answer

2-butene shows geometrical isomerism due to :

asked Jul 20, 2018 by pady_1

1 answer

2-Bromo pentane reacts with ethanolic KOH gives main product :

asked Jun 15, 2018 by pady_1

1 answer

If @@@@@@@@@ = 36 , what is @@@@ ?

asked Dec 31, 2015 by pady_1

1 answer

Which number is missing from this sequence? 90, 84, 78, 72, 66, __

asked Dec 31, 2015 by pady_1

1 answer

The area of a rectangular lounge is 100 square metres. It is 10 metres long. How wide is it?

asked Dec 31, 2015 by pady_1

0 answers

Six-sevenths of a number is 36. Find the number.

asked Dec 31, 2015 by pady_1

0 answers

One ticket to a show costs Rs. 50. Lovleen buys a total of 3 tickets for the show using a coupon that gives her a 20\% discount. Usha buys 4 tickets using a coupon that gives a 30\% discount. How much more did Usha pay than Lovleen?

asked Dec 31, 2015 by pady_1

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