Recent questions tagged 70

At a point A on the earth's surface the angle of dip, $\delta = +25^{\circ}$. At a point B on the earth's surface the angle of dip, $\delta =-25^{\circ}$. We can interpret that.

asked Jul 8, 2019 by pady_1

1 answer

4.5 moles each of hydrogen and iodin heated in a sealed 10 L vessel. At equilibrium 3 moles of HI were found. The equilibrium constant for $H_{2(g)} + I_{2(g)} \leftrightharpoons 2HI_{(g)} $ is :

asked Dec 19, 2018 by pady_1

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Absolute alcohol is prepared by distillation of rectified spirit in the presence of :

asked Dec 19, 2018 by pady_1

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Which of the following hydrocarbon has least carbon-carbon bond length ?

asked Dec 19, 2018 by pady_1

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Which one of the following is used in the preparation of styrene ?

asked Dec 11, 2018 by pady_1

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A particle of mass $m$ mooves along line PC with velocity $v$ as shown. What is the angular momentum of the particle about $O$ ?

asked Dec 11, 2018 by pady_1

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A 220 V, 1000 W bulb is connected across a 110 V mains supply. The power conumed will be :

asked Dec 11, 2018 by pady_1

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How long (approximate) should water be electrolysed by passing through 100 amperes current so that the oxygen released can completely burn 27.66 g of diborane ? (Atomic weight of B = 10.8 u)

asked Dec 11, 2018 by pady_1

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Whcih of the following compounds will behave as a reducing sugar in an aqueous KOH solution?

asked Dec 11, 2018 by pady_1

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Let $p = \displaystyle{\lim_{x \to 0^+} (1 + \tan^2 \sqrt{x} )^{1/2x} }$ then $\log p$ is equal to :

asked Dec 11, 2018 by pady_1

1 answer

$\displaystyle{\lim_{x \to 0} \frac{e^{x^2}-\cos x}{\sin^2x}}$ is equal to :

asked Dec 11, 2018 by pady_1

1 answer

For the estimation of nitrogen, $1.4\; g$ of organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in $60 \;mL$ of $\frac{M}{10}$ sulphuric acid. The unreacted acid require$20\; ml$ of $\frac{M}{10}$ sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is:

asked Dec 11, 2018 by pady_1

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In a hydrogen like atom electron makes transition from an energy level with quantum number n to another with quantum number (n – 1). If n >> 1, the frequency of radiation emitted is proportional to

asked Dec 11, 2018 by pady_1

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The standard reduction potentials for $Zn^{2+}/Zn, Ni^{2+}/Ni$ and $Fe^{2+}/Fe$ are -0.76, -0.23 and -0.44V respectively. The reaction $X + Y^2 \to X^{2+} + Y$ will be spontaneous when :

asked Dec 11, 2018 by pady_1

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Boron cannot form which one of the following anions ?

asked Dec 11, 2018 by pady_1

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Let $f : R \to R$ be defined by $f(x) = \begin{cases} k-2x, & \quad \text{if } \text{ x $\leq$ -1}\\ 2x + 3, & \quad \text{if } \text{ x > -1} \end{cases} $. If $f$ has a local minimum at $x=-1$, then a possible value of $k$ is

asked Dec 11, 2018 by pady_1

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$\begin{align} \int_0^{\pi} [\cot x] dx, \;[.] \end{align} $ denotes the greatest integer function, is equal to

asked Nov 29, 2018 by pady_1

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The $pK_a$ of a weak acid, HA, is 4.80. The pKb of a weak base, BOH, is 4.78. The pH of an aqueous solution of the corresponding salt, BA, will be

asked Nov 29, 2018 by pady_1

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A parallel plate condenser with a dielectric of dielectric constant $K$ between the plates has a capacity $C$ and is charged to a potential $V$ volts. The dielectric slab is slowly removed from between the plates and then reinserted. The network done by the system in this process is:

asked Nov 29, 2018 by pady_1

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The pyrimidine bases present in DNA are :

asked Nov 13, 2018 by pady_1

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If $a_1, a_2, a_3, . . . .a_n,...$ are in GP, then the determinant $\Delta = \begin{vmatrix} \log a_n & \log a_{n+1} & \log a_{n+2} \\ \log a_{n+3} & \log a_{n+4} & \log a_{n+5} \\ \log a_{n+6} & \log a_{n+7} & \log a_{n+8} \end{vmatrix}$ is equal to :

asked Nov 5, 2018 by pady_1

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The phase difference between the alternating current and emf is $\pi/2$. Which of the following cannot be the constituent of the circuit ?

asked Nov 5, 2018 by pady_1

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With two forces acting at a point, the maximum effect is obtained when their resultant is 4N. If they act at right angles, then their resultant is 3N. Then the forces are

asked Nov 5, 2018 by pady_1

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Consider the following species : $CN^+, CN^-, NO$ and $CN$ Which one of these will have the highest bond order ?

asked Aug 21, 2018 by pady_1

1 answer

In Bougainvillea thorns are the modifications of :

asked Aug 21, 2018 by pady_1

1 answer

In context of Amniocentesis, which of the following statement is incorrect ?

asked Aug 21, 2018 by pady_1

1 answer

Coconut water from a tender coconut is -

asked Aug 21, 2018 by pady_1

1 answer

In acidic medium, $H_2O_2$ changes $Cr_2 O_7^{-2}$ to $CrO_5$ which has two $(- O - O - )$ bonds Oxidation state of $Cr$ in $CrO_5$ is :

asked Aug 20, 2018 by pady_1

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In excess of $AgNO_3$ is added to 100 mL of a 0.01 M solution of dichlorotetraaquachrominum (III) chloride. The number of moles of AgCl precipitated would be-

asked Aug 20, 2018 by pady_1

1 answer

The enthalpy of fusion of water is $1.435 \frac{kcal}{mol}$. The molar entropy change for the melting of ice at $0^{\circ}C$ is :

asked Aug 20, 2018 by pady_1

1 answer

If n = 6, the correct sequence for filling of electrons will be :

asked Aug 16, 2018 by pady_1

1 answer

An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase?

asked Jul 26, 2018 by pady_1

1 answer

Among the following which is the strongest oxidizing agent ? -

asked Jul 26, 2018 by pady_1

1 answer

The stability of carbanions in the following : (i) $R-C \equiv \overset{\Theta}{C}$ (ii) <img src =" "/> (iii) $R_2C=\overset{\Theta}{CH}$ (iv) $R_3Câ€“\overset{\Theta}{C}H_2$ is in the order of :

asked Jul 26, 2018 by pady_1

1 answer

In which of the following pairs, the two species are iso-structural ?

asked Jul 26, 2018 by pady_1

1 answer

$[NH(CH_2)NHCO(CH_2)CO]_n$ is a:-

asked Jul 25, 2018 by pady_1

1 answer

Which one of the following pair represents stereo isomerism :-

asked Jul 24, 2018 by pady_1

1 answer

Which of the following is least reactive in a nucleophilic substitution reaction :-

asked Jul 24, 2018 by pady_1

1 answer

The following equilibria are given : <img src = ""/>

asked Jul 24, 2018 by pady_1

1 answer

Which of the following statement is true : -

asked Jul 23, 2018 by pady_1

1 answer

Enthalpy of $CH_4 + \frac{1}{2} O_2 \to CH_3OH$ is negative. If enthalpy of combustion of $CH_4$ and $CH_3OH$ and x and y respectively. Then which relation is correct : -

asked Jul 20, 2018 by pady_1

1 answer

A cube of any crystal A-atom placed at every corners and B-atom placed at every centre of face. The formula of compound :

asked Jul 20, 2018 by pady_1

1 answer

The cell reaction of an electrochemical cell is $Cu^{+2}(C_1) + Zn \rightarrow Zn^{+2}(C_2) + Cu$. The change in free energy will be the function of :

asked Jun 15, 2018 by pady_1

1 answer

CHAIR : TABLE ::

asked Dec 31, 2015 by pady_1

1 answer

, The bar graph shows the results when a die was thrown a number of times. How many sixes were thrown?

asked Dec 31, 2015 by pady_1

1 answer

Convert: 3 m 84 cm = ......... cm

asked Dec 31, 2015 by pady_1

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The parking lot of the Shopping Complex has a capacity of 1404 cars. On Mondays the ratio of occupied spots to empty spots in the parking lot was 13:23. The number of additional cars that could park there is

asked Dec 31, 2015 by pady_1

1 answer

What fraction of following letters can be drawn using straight lines ? A H W X B G Q S

asked Dec 31, 2015 by pady_1

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