During the extraction of gold the following reactions take place $$\mathrm{Au + C{N^ - } + {H_2}O\buildrel {{O_2}} \over

The number of gram molecules of chlorine in $$6.02\times10^{25}$$ hydrogen chloride molecules is

Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that, graphit

Paracetamol is a/an

Which one of the following has maximum number of atoms of oxygen?

Which one of the following shows functional isomerism?

In the ionic equation, $$\mathrm{BiO_3^-+6H^++xe^-\rightarrow Bi^{3+}+3H_2O}$$, the value of x is

Molarity of a given orthophosphoric acid solution is 3M. It’s normality is

Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration which confirms the p

A body of mass 10 mg is moving with a velocity of 100 ms$$^{-1}$$. The wavelength of de-Broglie wave associated with it

Mg$$^{2+}$$ is isoelectronic with

Gram molecular volume of oxygen at STP is

Presence of halogen in organic compounds can be detected using

The electronic configuration of Cr$$^{3+}$$ is

The mass of a metal, with equivalent mass 31.75, which would combine with 8 g of oxygen is

Benzene reacts with chlorine in sunlight to give a final product

In the periodic table metals usually used as catalysts belong to

Dalton’s law of partial pressures is applicable to which one of the following systems?

The general formula of a cycloalkene is

In acetylene molecule, between the carbon atoms there are

Denatured alcohol is

During the formation of a chemical bond

One mole of oxygen at 273 K and one mole of sulphur dioxide at 546 K are taken in two separate containers, then

+I-effect is shown by

Formation of coloured solution is possible, when metal ion in the compound contains

Which of the following is an intensive property?

Hofmann’s bromamide reaction is to convert

IUPAC name of Na$$_3$$[Co(NO$$_2$$)$$_6$$] is

Thermodynamic standard conditions of temperature and pressure are

How many chiral carbon atoms are present in 2, 3, 4-trichloropentane ?

The number of unidentate ligands in the complex ion is called

$$2S{O_2}(g) + {O_2}(g)\buildrel {{V_2}{O_5}} \over \rightleftharpoons $$ is an example for

The amino acid which is not optically active is

For a stable molecule the value of bond order must be

Which one of the following is a second order reaction?

According to Baeyer's strain theory which is highly stable?

The number of antibonding electron pairs in O$$_2^{2-}$$ molecular ion on the basis of molecular orbital theory is [Atom

Hydroxyl ion concentration of 1M HCl is

Geometrical isomerism is shown by

The oxidation state of iron in K$$_4$$[Fe(CN)$$_6$$] is,

In which of the following process, a maximum increase in entropy is observed?

Decomposition of benzene diazonium chloride by using Cu$$_2$$Cl$$_2$$/HCl to form chlorobenzene is

Which complex cannot ionise in solution?

Consider the reaction, C(s) + O$$_2$$(g) $$\rightarrow$$ CO$$_2$$(g) + 393.5 kJ The signs of $$\Delta H,\Delta S$$ and $

The product formed when hydroxylamine condenses with a carbonyl compound is called

Which of the following forms a colourless solution in aqueous medium?

When a sulphur sol is evaporated, sulphur is obtained. On mixing with water, sulphur sol is not formed. The sol is

An alkyl halide reacts with alcoholic ammonia in a sealed tube, the product formed will be

When conc. H$$_2$$SO$$_4$$ is heated with P$$_2$$O$$_5$$, the acid is converted into

Entropy of the universe is

Which of the following salts on being dissolved in water gives pH > 7 at 25$$^\circ$$C ?

The reagent used in Clemmenson's reduction is

When KBr is dissolved in water, K$$^+$$ ions are

The noble gas mixture is cooled in a coconut bulb at 173 K. The gases that are not adsorbed are

The volume of 10N and 4N HCl required to make 1 litre of 7N HCl are

A metal present in insulin is

Carbon forms two oxides which have different compositions. The equivalent mass of which remains constant?

Maximum number of molecules of CH$$_3$$I that can react with a molecule of CH$$_3$$NH$$_2$$ are

Ellingham diagram represents a graph of

Identify the ore not containing iron

$${7^{2{{\log }_7}5}}$$ is equal to

In the group $$(G\,{ \otimes _{15}})$$, where $$G = \{ 3,6,9,12\} $$, $${ \otimes _{15}}$$ is multiplication modulo 15,

A group (G *) has 10 elements. The minimum number of elements of G, which are their own inverses is

If a and b are vectors such that $$|a + b|=|a-b|$$, then the angle between a and b is

$${{3{x^2} + 1} \over {{x^2} - 6x + 8}}$$ is equal to

If $$a = 2\widehat i + 3\widehat j - \widehat k,b = \widehat i + 2\widehat j - 5\widehat k,c = 3\widehat i + 5\widehat j

OA and BO are two vectors of magnitudes 5 and 6 respectively. If $$\angle BOA=60^\circ$$, then OA . OB is equal to

A vector perpendicular to the plane containing the points $$A(1, - 1,2),B(2,0, - 1),C(0,2,1)$$ is

$${1 \over {2\,.\,5}} + {1 \over {5\,.\,8}} + {1 \over {8\,.\,11}} + ............. + {1 \over {(3n - 1)(3n + 2)}} = $$

The ninth term of the expansion $${\left( {3x - {1 \over {2x}}} \right)^8}$$ is

If $$A = \left[ {\matrix{ 1 & { - 1} & 1 \cr 2 & 1 & { - 3} \cr 1 & 1 & 1 \cr } } \right],10B = \left[

If $$A = \left[ {\matrix{ 0 & x & {16} \cr x & 5 & 7 \cr 0 & 9 & x \cr } } \right]$$ is singular, then

If $$A = \left[ {\matrix{ 1 & { - 2} & 2 \cr 0 & 2 & { - 3} \cr 3 & { - 2} & 4 \cr } } \right]$$, then

If $$f:R \to R$$ is defined by $$f(x) = |x|$$, then

The value of $$\left| {\matrix{ x & p & q \cr p & x & q \cr p & q & x \cr } } \right|$$ is

The number of common tangents to the circles $$x^2+y^2=4$$ and $$x^2+y^2-6x-8y-24=0$$ is,

If $$3x+y+k=0$$ is a tangent to the circle $$x^2+y^2=10$$, the values of k are

The negation of the proposition “If 2 is prime, then 3 is odd” is

The equation to two circles which touch the Y-axis at (0, 3) and make an intercept of 8 units on X-axis are

The orthocentre of the triangle with vertices A(0, 0), B(0, 3/2), C($$-$$5, 0) is

$${x^2} + {y^2} - 6x - 6y + 4 = 0$$, $${x^2} + {y^2} - 2x - 4y + 3 = 0$$, $${x^2} + {y^2} + 2kx + 2y + 1 = 0$$. If the r

If the circles $${x^2} + {y^2} - 2x - 2y - 7 = 0$$ and $${x^2} + {y^2} + 4x + 2y + k = 0$$ cut orthogonally, then the le

The coordinates of the foot of the perpendicular drawn from the point (3, 4) on the line $$2x+y-7=0$$ is

The area enclosed by the pair of lines $$xy=0$$, the line $$x-4=0$$ and $$y+5=0$$ is

If the area of the auxillary circle of the ellipse $${{{x^2}} \over {{a^2}}} + {{{y^2}} \over {{b^2}}} = 1(a > b)$$ is t

A graph G has m vertices of odd degree and ‘n’ vertices of even degree. Then which of the following statements is necess

If p is any point on the ellipse $${{{x^2}} \over {36}} + {{{y^2}} \over {16}} = 1$$, and S and S' are the foci, then $$

The value of $$\sin \left[ {2{{\cos }^{ - 1}}{{\sqrt 5 } \over 3}} \right]$$ is

If $${{{x^2}} \over {36}} - {{{y^2}} \over {{k^2}}} = 1$$ is a hyperbola, then which of the following statements can be

The focus of the parabola is

The solution of $${\tan ^{ - 1}}x + 2{\cot ^{ - 1}}x = {{2\pi } \over 3}$$ is

$${\sin ^2}17.5^\circ + \sin 72.5^\circ $$ is equal to

The conjugate of the complex number $${{{{(1 + i)}^2}} \over {1 - i}}$$ is

ABC is a triangle with $$\angle A=30^\circ$$ and BC = 10 cm. The area of the circumcircle of the triangle is

If $$\sin 3\theta = \sin \theta $$, how many solutions exist such that $$ - 2\pi

The imaginary part of $$i^i$$ is

The amplitude of $${(1 + i)^5}$$ is

ABC is a triangle, G is the centroid, D is the mid-point of BC. If A = (2, 3) and G = (7, 5), then the point D is

$$\mathop {\lim }\limits_{x \to 1} {{\tan ({x^2} - 1)} \over {x - 1}}$$ is equal to

If $$y = {2^{\log x}}$$, then $${{dy} \over {dx}}$$ is

If $${\sec ^{ - 1}}\left( {{{1 + x} \over {1 - y}}} \right) = a$$, then $${{dy} \over {dx}}$$ is

If $$y = {\cos ^2}{{3x} \over 2} - {\sin ^2}{{3x} \over 2}$$, then $${{{d^2}y} \over {d{x^2}}}$$ is

If the function $$f(x) = \left\{ {\matrix{ {{{1 - \cos x} \over {{x^2}}},} & {\mathrm{for}\,x \ne 0} \cr {k,} &

If $$1,\omega ,{\omega ^2}$$ are the cube roots of unity, then $$(1 + \omega )(1 + {\omega ^2})(1 + {\omega ^4})(1 + {\o

If $${x^x} = {y^y}$$, then $${{dy} \over {dx}}$$ is

The point on the curve $$y^2=x$$, the tangent at which makes an angle 45$$^\circ$$ with X-axis is

The length of the subtangent to the curve $${x^2}{y^2} = {a^4}$$ at $$( - a,a)$$ is

The number of positive divisors of 252 is

The remainder obtained when 5124 is divided by 124 is

Which of the following is not a group with respect to the given operation?

The range in which $$y = - {x^2} + 6x - 3$$ is increasing, is

The value of the integral $$\int\limits_0^{\pi /2} {({{\sin }^{100}}x - {{\cos }^{100}}x)dx} $$ is

OA and OB are two roads enclosing an angle of 120$$^\circ$$. X and Y start from O at the same time. X travels along OA w

If $$k\int\limits_0^1 {x\,.\,f(3x)dx = \int\limits_0^3 {t\,.\,f(t)dt} } $$, then the value of $$k$$ is

The value of $$\int {{1 \over {1 + \cos 8x}}dx} $$ is

The value of $$\int {{e^x}({x^5} + 5{x^4} + 1)\,.\,dx} $$ is

The value of $$\int {{{{x^2} + 1} \over {{x^2} - 1}}dx} $$ is

The area bounded by the curve $$x=4-y^2$$ and the Y-axis is

The differential equation of the family of straight lines whose slope is equal to y-intercept is

The order and degree of the differential equation $${\left[ {1 + {{\left( {{{dy} \over {dx}}} \right)}^5}} \right]^{{1 \

Light of frequency 1015 Hz falls on a metal surface of work function 2.5 eV. The stopping potential of photoelectrons (i

A proton accelerated through a potential V has de-Broglie wavelength $$\lambda$$. Then, the de-Broglie wavelength of an

Consider a thin spherical shell of radius R consisting of uniform surface charge density s. The electric field at a poin

An electron of an atom transits from $$n_1$$ to $$n_2$$. In which of the following maximum frequency of photon will be e

Two protons are kept at a separation of 40 $$\mathop A\limits^o $$. F$$_n$$ is the nuclear force and F$$_e$$ is the elec

Two radioactive materials X$$_1$$ and X$$_2$$ have decay constant 5$$\lambda$$ and $$\lambda$$, respectively. If initial

The Poisson's ratio of a material is 0.1. If the longitudinal strain of a rod of this material is $$10^{-3}$$, then the

A satellite can be in a geostationary orbit around a planet if it is at a distance R from the centre of the planet. If t

When a $$p$$-$$n$$ junction diode is connected in forward bias, its barrier potential

Ground waves have wavelength

A ball floats on the surface of water in a container exposed to the atmosphere. When the container is covered and the ai

A frame made of metallic wire enclosing a surface area A is covered with a soap film. If the area of the frame of metall

A compound slab is made of two parallel plates of copper and brass of the same thickness and having thermal conductiviti

In mm$$^3$$ of a gas is compressed at 1 atmospheric pressure and temperature 27$$^\circ$$C to 627$$^\circ$$C. What is th

If sink is at a temperature of $$-39\Upsilon$$C and source at 0$$^\circ$$C, then efficiency will be

Which of the following laws of Physics is valid across all domains of nature?

A particle of mass m is moving in a horizontal circle of radius R under a centripetal force equal to $$-\frac{A}{R^2}$$

A force of 20 N is applied on a body of mass 5 kg resting on a horizontal plane. The body gains a kinetic energy of 10 J

A body under the action of a force $$F = 6\widehat i - 8\widehat j + 10\widehat k$$, acquires an acceleration of 1 m/s2.

A body of mass 1000 kg is moving horizontally with a velocity 50 m/s. A mass of 250 kg is added. Find the final velocity

Equal volumes of two gases, having their densities in the ratio of 1 : 16 exert equal pressures on the walls of two cont

A gaseous mixture consists of 16 g of helium and 16 g of oxygen. The ratio $$C_p/C_V$$ of the mixture is

A particle executes a linear SHM with an amplitude of 4 cm. At the mean position the velocity of the particle is 10 cm/s

The equation of a progressive wave can be given by $$y=15\sin(660\pi t-0.02\pi x)$$ cm. The frequency of the wave is

A source of sound gives 5 beats per second, when sounded with another source of frequency 100 s$$^{-1}$$. The second har

A charge of 0.8 C is divided into two charges Q$$_1$$ and Q$$_2$$. These are kept at a separation of 30 cm. The force on

An electric dipole has a pair of equal and opposite point charges $$q$$ and $$-q$$ separated by a distance $$2x$$. The a

An electric dipole is placed in a uniform electric field with the dipole axis making an angle $$\theta$$ with the direct

Two point charges A = +3 nC and B = +1 nC are placed 5 cm apart in air. The work done to move charge B towards A by 1 cm

The potential energies associated with four orientations of an electric dipole in an electric field are (i) $$-5U_0$$ (i

Suppose refractive index $$\alpha$$ is given as $$ \alpha = A + {B \over {{\lambda ^2}}}$$, where A and B are constants

If voltage $$V=(200\pm 8)V$$ and current $$I=(20\pm0.5)A$$, then the percentage error in resistance R is

A body is projected vertically upwards. The times corresponding to height $$h$$, while ascending and while descending ar

A particle shows distance-time curve as given in this figure. The maximum instantaneous velocity of the particle is arou

A fluid is in streamline flow across a horizontal pipe of variable area of cross-section. For this which of the followin

Two capacitors $$C_1$$ and $$C_2$$ are charged to 120 V and 200 V, respectively. When they are connected in parallel, it

Point out the right statements about the validity of Kirchhoff’s junction rule,

Four particles each of the mass m are placed at the corners of a square of side length $$l$$. The radius of gyration of

A steel wire of length 4.7 m and cross-sectional area $$3.0\times10^{-5}$$ m$$^2$$ stretches by the same amount as a cop

The masses of 200 g and 300 g are attached to the 20 cm and 70 cm marks of a light meter rod, respectively. The moment o

Two spherical bodies of masses M and 5M and radii R and 2R are released in free space with initial separation between th

If $$P=Q=R=10\Omega$$ and $$S=20\Omega$$, then what resistance should be joined with S to balance the Wheatstone's netwo

To the potentiometer wire of length L and 10$$\Omega$$ resistance, a battery of emf 2.5 V and a resistance R are connect

An electron moves with speed of 2 $$\times$$ 10$$^5$$ m/s along the positive x-direction in a magnetic field $$B = (\wid

A horizontal overhead power line carries a current of 90 A in East to West direction. What is the magnitude and directio

A moving coil galvanometer has 28 turns and area of coil is $$4\times 10^{-2}$$ m$$^2$$. If the magnetic field is 0.2 T,

The intensity of magnetic field due to an isolated pole of strength $$m_p$$ at a point distant $$r$$ from it will be

The particle that cannot be accelerated by a cyclotron is

The angle which the total magnetic field of earth makes with the surface of the earth is called

The angle of dip of at a place where horizontal and vertical components of earth’s magnetic field are equal is

A coil of wire of a certain radius has 100 turns and a self inductance of 15 mH. The self inductance of a second similar

A coil of 100 turns carries a current of 5 mA and creates a magnetic flux of 10$$^{-5}$$ Wb. The inductance is

In step-up transformer, relation between number of turns in primary (N$$_P$$) and number of turns in secondary (N$$_S$$)

For a series L-C-R circuit at resonance, which statement is not true?

Which of the following has/have zero average value in a plane electromagnetic wave?

A convex lens is made of 3 layers of glass of 3 different materials as in the figure. A point object is placed on its a

A ray of light suffers minimum deviation in equilateral prism P. Additional prisms Q and R of identical shape and of sam

Two identical light waves, propagating in the same direction, have a phase difference $$\delta$$. After they superpose t

A plastic sheet (refractive index = 1 6. ) covers one slit of a double slit arrangement for the Young’s experiment. When

A particle starts moving from point (2, 10, 1). Displacement for the particle is $$8\widehat i - 2\widehat j + \widehat