Recent questions tagged 2006

The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is:-

asked Jul 25, 2018 by pady_1

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Which of the following is not a correct statement:-

asked Jul 25, 2018 by pady_1

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The orientation of an atomic orbital is governed by:-

asked Jul 25, 2018 by pady_1

1 answer

Which of the following is the most basic oxide:-

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Which of the following species has a linear shape

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The correct order regarding the electronegativity of hybrid orbitals of carbon is:-

asked Jul 25, 2018 by pady_1

1 answer

The correct order of the mobility of the alkali metal ions in aqueous solution is:

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1 answer

A solution of acetone is ethanol:-

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The hydrogen ion concentration of a $10^{–8}$M HCl aqueous solution at $298 K (K_W = 10^{–14}) $is:-

asked Jul 25, 2018 by pady_1

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Which of the following pairs constitutes a buffer:-

asked Jul 25, 2018 by pady_1

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1.00 g of a non-electrolyte solute (molar mass $250g mol^–1$) was dissolved in 51.2 g of benzene. If the freezing point depression constant $K_f$ of benzene is $5.12 K kg mol^{–1}$, the freezing point of benzene will be lowered by:-

asked Jul 25, 2018 by pady_1

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$[Cr(H_2O_2)_6]Cl_3$ (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

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$[CO(NH_3)_4(NO_2)_2]Cl$ exhibits:-

asked Jul 25, 2018 by pady_1

1 answer

Which of the following is not chiral:-

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A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of $\alpha$ hydroxy acid. The carbonyl compound is:

asked Jul 25, 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

For the reaction : $CH_4(g)+2O_2(g)\rightleftharpoons CO_2(g)+2H_2O(l)$ $\Delta H_{r}=-170.8KJ mol^{-1}$ Which of the following statements is not true:-

asked Jul 25, 2018 by pady_1

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For the reaction : $2A+B\to 3C+D$ Which of the following does not express the reaction rate:-

asked Jul 25, 2018 by pady_1

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If $E^{\circ}_{Fe^{2+}/Fe}=-0.441V$ and $E^{\circ}_{Fe^{3+}/Fe^{2+}}=-0.771V$, the standard EMF of the reaction : ${Fe/2Fe^{3+}}\to 3Fe^{2+}$ will be:

asked Jul 25, 2018 by pady_1

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The general molecular formula, which represents the homologus series of alkanols is:-

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1 answer

The appearance of colour in solid alkali metal halides is generally due to :

asked Jul 25, 2018 by pady_1

1 answer

During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process: $Proteins \xrightarrow{Enzyme(A)} Polypeptides \xrightarrow{Enzyme(B)} Amino\; acids$, are respectively-

asked Jul 25, 2018 by pady_1

1 answer

In a set of reactions propionic acid yielded a compound D. $CH_3CH_2COOH \xrightarrow{SOCl_2} B \xrightarrow{NH _3} C \xrightarrow[{ Br_2 }]{KOH} D$ The structure of D would be:-

asked Jul 25, 2018 by pady_1

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Assume each reaction is carried out in an open container. For which reaction will $\Delta H =\Delta E$

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A plot of log x/m versus log p for the adsorption of a gas on a solid gives a straight line with slope equal to:

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A solution containing 10 g per dm 3 of urea (molecular mass = $60g mol^{-1}$) is isotonic with a 5% solution of a nonvolatile solute. The molecular mass of this nonvolatile solution is:

asked Jul 25, 2018 by pady_1

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Identify the correct statement for change of Gibbs energy for a system $(\Delta G_{system})$ at constant temperature and pressure:-

asked Jul 25, 2018 by pady_1

1 answer

A car runs at a constant speed on a circular track of radius 100 m, taking 62.8 seconds for every circular lap. The average velocity and average speed for each circular lap respectively is:

asked Jul 25, 2018 by pady_1

1 answer

A parallel plate air capacitor is charged to a potential difference of V volts. After disconnecting the charging battery the distance between the plates of the capacitor is increased using an insulating handle. As a result the potential difference between the plates:-

asked Jul 25, 2018 by pady_1

1 answer

An electric dipole of moment p is lying along a r uniform electric field E . The work done in rotating the dipole by 90º is:-

asked Jul 25, 2018 by pady_1

1 answer

A convex lens and a concave lens, each having same focal length of 25 cm, are put in contact to form a combination of lenses. The power in dipoters of the combination is:-

asked Jul 25, 2018 by pady_1

2 answers

Above Curie temperature:-

asked Jul 25, 2018 by pady_1

1 answer

Which one of the following statements is true:

asked Jul 25, 2018 by pady_1

1 answer

The molar specific heat at constant pressure of an ideal gas is $[\frac 7 2]R$. The ratio of specific heat at constant pressure to that at constant volume is:-

asked Jul 25, 2018 by pady_1

1 answer

The momentum of a photon of energy 1MeV in kg m/s, will be-

asked Jul 25, 2018 by pady_1

1 answer

The moment of inertia of a uniform circular disc of radius 'R' and mass 'M' about an axis touching the disc at its diameter and normal to the disc is:-

asked Jul 25, 2018 by pady_1

1 answer

A 0.5 kg ball moving with a speed of 12 m/s strikes a hard wall at an angle of 30Âº with the wall. It is reflected with the same speed and at the same angle. If the ball is in contact with the wall for 0.25 seconds, the average force acting on the wall is:-

asked Jul 25, 2018 by pady_1

1 answer

A coil of inductive reactance $31\Omega$ has a resistance of $8\Omega$. It is placed in series with a condenser of capacity reactance $25\Omega$. The combination is connected to an a.c. source of 110 volt. The power factor of the circuit is:-

asked Jul 25, 2018 by pady_1

1 answer

A photo-cell employs photoelectric effect to convert:-

asked Jul 25, 2018 by pady_1

1 answer

A forward biased diode is:-

asked Jul 25, 2018 by pady_1

1 answer

A transistor is operated in common emitter configuration at constant collector voltage $V_c = 1.5 V$ such that a change in the base current from 100 µA to 150 µA produces a change in the collector current from 5 mA to 10 mA. The current gain $\beta$ is:-

asked Jul 25, 2018 by pady_1

1 answer

300 J of work is done in sliding a 2 kg block up an inclined plane of height 10m. Taking $g = 10 m/s^2$, work done against friction is

asked Jul 25, 2018 by pady_1

1 answer

A microscope is focused on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again:-

asked Jul 25, 2018 by pady_1

1 answer

The velocity v of a particle at time t is given by $V=at+\frac{b}{t+c}$, where a, b and c are constants. t + c The dimensions of a, b and c are respectively:-

asked Jul 25, 2018 by pady_1

1 answer

A transistor-oscillator using a resonant circuit with an inductor L (of negligible resistance) and a capacitor C in series produce oscillations of frequency f. If L is doubled and C is changed to 4C, the frequency will be:-

asked Jul 25, 2018 by pady_1

1 answer

Two circular coil 1 and 2 are made from the same wire but the radius of the $1^{st}$ coil is twice that of the $2^{nd}$ coil. What potential difference in volts should be applied across them so that the magnetic field at their centres is the same-

asked Jul 25, 2018 by pady_1

1 answer

A black body at 1227ºC emits radiations with maximum intensity at a wavelength of 5000Å. The temperature of the body is increased by 1000ºC, the maximum intensity will be observe at:-

asked Jul 25, 2018 by pady_1

1 answer

Two cells, having the same e.m.f., are connected in series through an external resistance R. Cell have internal resistances $r_1$ and $r_2$ ($r_1>r_2$) respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is:-

asked Jul 25, 2018 by pady_1

1 answer

When a charged particle moving with velocity r$\overrightarrow V$ is subjected to a magnetic field of induction r$\overrightarrow B$, the force on it is non-zero. This implies the:- r r

asked Jul 25, 2018 by pady_1

1 answer

HIV that causes AIDS, first starts destroying

asked Jul 25, 2018 by pady_1

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