Recent questions in 2014

Which one of the following is an example of a thermosetting polymer?

asked Aug 20, 2018 by pady_1

1 answer

Which of the following hormones is produced under the condition of stress which stimulates glycogenolysis in the liver of human being?

asked Aug 20, 2018 by pady_1

1 answer

D(+) glucose reacts with hydroxyl amine and yield an oxime. The structure of the oxime would be:

asked Aug 20, 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

In the following reaction, the product (A)

asked Aug 20, 2018 by pady_1

1 answer

Reason of lanthanoid contraction is :

asked Aug 20, 2018 by pady_1

1 answer

Which of the following complexes is used to be as an anticancer agent?

asked Aug 20, 2018 by pady_1

0 answers

Magnetic moment 2.83 BM is given by which of the following ions? (At. nos. Ti = 22, Cr = 24, Mn = 25, Ni = 28)

asked Aug 20, 2018 by pady_1

2 answers

Among the following complexes the one which shows Zero crystal field stabilizations energy (CFSE) :

asked Aug 20, 2018 by pady_1

2 answers

The reaction of aqueous $KMnO_4$ with $H_2O_2$ in acidic conditions gives :

asked Aug 20, 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

0 answers

Artificial sweetner which is stable under cold conditions only is :

asked Aug 20, 2018 by pady_1

1 answer

(a) $H_2O_2 + O_3 \to H_2O + 2O_2$ (b) $H_2O_2 + Ag_2O \to 2Ag +H_2O + O_2$ Role of hydrogen peroxide in the above reactions is respectively :

asked Aug 20, 2018 by pady_1

1 answer

Acidity of diprotic acids in aqueous solutions increases in the order:

asked Aug 20, 2018 by pady_1

1 answer

Which one of the following species has plane triangular shape?

asked Aug 20, 2018 by pady_1

1 answer

Which of the following molecules has the maximum dipole moment?

asked Aug 20, 2018 by pady_1

1 answer

$Be^{2+}$ is isoelectronic with which of the following ions?

asked Aug 20, 2018 by pady_1

1 answer

The pair of compounds that can exist together is:

asked Aug 20, 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 orders of ionic radii is correctly represented?

asked Aug 20, 2018 by pady_1

1 answer

For a given exothermic reaction, $K_P$ and $K_P'$ are the equilibrium constants at temperatures $T_1$ and $T_2$ respectively. Assuming that heat of reaction is constant in temperatures range between $T_1$ and $T_2$ , it is readily observation that:

asked Aug 20, 2018 by pady_1

1 answer

For the reaction : $X_2O_4 (l) \to 2XO_2 (g)$ $\Delta U = 2.1 \; k \; cal, \; \Delta s = 20 \; cal \; K^{-1} $ at $300 K$

asked Aug 20, 2018 by pady_1

1 answer

For the reversible reaction : $N_2 (g) + 3H_2(g) \leftrightharpoons 2NH_3 (g) + heat$ The equilibrium shifts in forward direction -

asked Aug 20, 2018 by pady_1

1 answer

Which of the following statements is correct for the spontaneous adsorption of a gas?

asked Aug 20, 2018 by pady_1

1 answer

The weight of silver (at.wt. = 108) displaced by a quantity of electricity which displaces 5600 ml of $O_2$ at STP will be -

asked Aug 20, 2018 by pady_1

2 answers

Using the Gibbs change, $\Delta G^o = + 63.3 \;kJ$, for the following reaction, $Ag_2CO_3 (g) \leftrightharpoons 2 Ag^+ (aq) + CO^{2-}_3 (aq)$ the $K_{sp}$ of $Ag_2CO_3 (s)$ in water at $25^oC$ is ($R = 8.314 \; JK^{-1} mol^{-1}$)

asked Aug 20, 2018 by pady_1

1 answer

When 0.1 mol $MnO_4^{2-}$ is oxidised the quantity of electricity required to completely $MnO_4^{2-}$ to $MnO_4^-$ is -

asked Aug 20, 2018 by pady_1

1 answer

When 22.4 litres of $H_2(g) $ is mixed with 11.2 litres of $Cl_2 (g)$, each at STP, the moles of $HCl(g) $ formed is equal to -

asked Aug 20, 2018 by pady_1

1 answer

Of the following 0.1 M aqueous solutions, which one will exhibit the largest freezing point depression ?

asked Aug 20, 2018 by pady_1

1 answer

Which of the following salts will give highest pH in water?

asked Aug 20, 2018 by pady_1

1 answer

Which property of colloids is not dependent on the charge on colloidal particles?

asked Aug 20, 2018 by pady_1

1 answer

If a the length of the side of a cube, the distance between the body centered atom one corner atom in the cube will be -

asked Aug 20, 2018 by pady_1

1 answer

Equal masses of $H_2, O_2$ and methane have been taken in a container of volume V at temperature $27^oC$ in identical conditions. The ratio of the volumes of gases $H_2: O_2: methane$ would be -

asked Aug 20, 2018 by pady_1

1 answer

Calculate the energy in corresponding to light of wavelength 45nm : (Planck's constant $h = 6.63 \times 10^{-34} Js$ : speed of light $c = 3 \times 10^8 ms^{-1}$)

asked Aug 20, 2018 by pady_1

1 answer

What is the maximum number of orbitals that can be identified with the following quantum number n = 3, $\ell$ = 1, m = 0

asked Aug 20, 2018 by pady_1

1 answer

The barrier potential of a p-n junction depends on : (a) type of semi conductor material (b) amount of doping (c) temperature Which one of the following is correct?

asked Aug 20, 2018 by pady_1

1 answer

The given graph represents V-I characteristic for a semiconductor device. Which of the following statement is correct?

asked Aug 20, 2018 by pady_1

1 answer

A radio isotope 'X' with a half life $1.4 \times 10^9$ years decays to 'Y' which is stable. A sample of the rock from a cave was found to contain 'X' and 'Y' in the ratio 1 : 7. The age of the rock is :

asked Aug 20, 2018 by pady_1

1 answer

The Binding energy per nucleon of $_3^7Li$ and $_2^4 He$ nucleon are 5.60 MeV and 7.06 MeV, respectively. In the nuclear reaction $_3^7Li + _1^1 He \to _2^4 He + _2^4 He + Q, $ the value of energy $Q$ released is :

asked Aug 20, 2018 by pady_1

1 answer

Hydrogen atom in ground state is excited by a monochromatic radiation of $\lambda= 975 A^o$. Number of spectral lines in the resulting spectrum emitted will be :

asked Aug 20, 2018 by pady_1

1 answer

If the kinetic energy of the particle is increased to 16 times its previous value, the percentage change in the de-Broglie wavelength of the particle is:

asked Aug 20, 2018 by pady_1

1 answer

When the energy of the incident radiation is increased by $20%$, the kinetic energy of the photoelectrons emitted from a metal surface increased from emitted 0.5 eV to 0.8eV. The work function of the metal is :

asked Aug 20, 2018 by pady_1

1 answer

The angle of a prism is 'A'. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2A on the first surface returns back through the same path after suffering reflection at the silvered surface. The refractive index $\mu$, of the prism is:

asked Aug 20, 2018 by pady_1

1 answer

It the focal length of objective lens is increased then magnifying power of:

asked Aug 20, 2018 by pady_1

1 answer

In the Young's double slit experiment the intensity of light at a point on the screen where the path difference is $\lambda$ is K, ($\lambda$ being the wave length of light used). The intensity at a point where the path difference is $\lambda/4$, will be :

asked Aug 20, 2018 by pady_1

1 answer

A beam of light of $\lambda$ = 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2m away. The distance between first dark fringes on either side of the central bright fringe is :

asked Aug 20, 2018 by pady_1

1 answer

Light with an energy flux of $25 \times 10^4\; wm^{-2}$ falls on a perfectly reflecting surface at normal incidence. If the surface area is $15\; cm^2$ , the average force exerted on the surface is:

asked Aug 20, 2018 by pady_1

1 answer

A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6 A the voltage across the secondary coil and the current in the primary coil respectively are:

asked Aug 20, 2018 by pady_1

1 answer

A thin semicircular conducting the ring (PQR) of radius 'r' is falling with its plane vertical in a horizontal magnetic field B, as shown in figure. Teh potential difference developed across the ring when its speed is v, is:

asked Aug 20, 2018 by pady_1

1 answer

Two identical long conducting wires AOB and COD are placed at right angle to each other, with one above other such that $'O'$ is their common point for the two. The wires carry $I_1$ and $I_2$ currents, respectively. Point 'I' is lying at distance 'd' from '$O$' along a direction perpendicular to the plane containing the wires. The magnetic field at the point 'P' will be :

asked Aug 20, 2018 by pady_1

1 answer

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