Recent questions tagged neet

Predict the correct intermediate and product in the following reaction : $H_3C - CH \equiv CH \xrightarrow[\text{$HgSO_4$}]{\text{$H_2O, H_2SO_4$}} \stackrel{\hbox{Intermediate}}{\hbox{(A)}} \to \stackrel{\hbox{Product}}{\hbox{(B)}}$

asked Aug 21, 2018 by pady_1

2 answers

Machanism of a hypothetical reaction $X_2 + Y_2 \to 2XY$ is given below. (i) $X_2 \to X + X (fast)$ (ii) $X + Y_2 \rightleftharpoons XY + Y (slow)$ (iii) $X + Y \to XY (fast) $ The overall order of the reaction will be -

asked Aug 21, 2018 by pady_1

1 answer

Consider the reactions : Identify A, X, Y and Z

asked Aug 21, 2018 by pady_1

1 answer

A first order reaction has a specific reaction rate of $10^{–2} sec^{–1}$. How much time will it take for $20 \;g$ of the reactant to reduce to $5g$ ?

asked Aug 21, 2018 by pady_1

1 answer

Which one is the most acidic compound ?

asked Aug 21, 2018 by pady_1

1 answer

Which one is the wrong statement ?

asked Aug 21, 2018 by pady_1

1 answer

An example of a sigma bonded organometallic compound is-

asked Aug 21, 2018 by pady_1

1 answer

The correct order of the stoichiometries of $AgCl$ formed when $AgNO_3$ in excess is treated with the complexes : $CoCl_3.6NH_3, CoCl_3.5NH_3, CoCl_3.4NH_3$ respectively is -

asked Aug 21, 2018 by pady_1

1 answer

Which of the following is dependent on temperature ?

asked Aug 21, 2018 by pady_1

1 answer

Which is the incorrect statement ?

asked Aug 21, 2018 by pady_1

1 answer

A 20 litre container at 400 K contains $CO_2(g)$ at pressure $0.4\; atm$ and an excess of $SrO$ (neglect the volume of solid $SrO$). The volume of the container is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of $CO_2$ attains its maximum value, will be : (Given that : $SrCO_3 (s) \stackrel{K}\rightleftharpoons SrO (s) + CO_2 (g), Kp = 1.6 \; atm$ )

asked Aug 21, 2018 by pady_1

1 answer

Extraction of gold and silver involves leaching with $CN^–$ ion. Silver is later recovered by :

asked Aug 21, 2018 by pady_1

1 answer

It is because of inability of $ns^2$ electrons of the valence shell to participate in bonding that :

asked Aug 21, 2018 by pady_1

1 answer

Mixture of chloroxylenol and terpineol acts as :

asked Aug 21, 2018 by pady_1

1 answer

Match the interhalogen compounds of column I with the geometry in column II and assign the correct code .

asked Aug 21, 2018 by pady_1

1 answer

The equilibrium constants of the following are : $N_2 + 3H_2 \rightleftharpoons 2NH_3$ $N_2 + O_2 \rightleftharpoons 2NO$ $H_2 + \frac{1}{2} O_2 \to H_2O$ The equilibrium constant (K) of the reaction : $2NH_3 + \frac{5}{2} O_2 \stackrel{K}\rightleftharpoons 2NO + 3H_2O,$ will be

asked Aug 21, 2018 by pady_1

1 answer

Pick out the correct statement with respect to $[Mn(CN)_6]^{3-}$

asked Aug 21, 2018 by pady_1

1 answer

In which pair of ions both the species contain S – S bond?

asked Aug 21, 2018 by pady_1

1 answer

Which of the following is sink for CO?

asked Aug 21, 2018 by pady_1

1 answer

Identify A and predict the type of reaction

asked Aug 21, 2018 by pady_1

1 answer

With respect to the conformers of ethane, which of the following statements is true?

asked Aug 21, 2018 by pady_1

1 answer

Concentration of the $Ag^+$ ions in a saturated solution of $Ag_2C_2O_4$ is $2.2 \times 10^{-4} \; mol\; L^{-1}$. Solubility product of $Ag_2C_2 O_4$ is :

asked Aug 21, 2018 by pady_1

1 answer

The reason for greater range of oxidation states in actinoids is attributed to :

asked Aug 21, 2018 by pady_1

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Name the gas that can readily decolourise acidified $KMnO_4$ solution :

asked Aug 21, 2018 by pady_1

1 answer

Which one of the following pairs of species have the same bond order?

asked Aug 21, 2018 by pady_1

1 answer

The correct increasing order of basic strength for the following compounds is :

asked Aug 21, 2018 by pady_1

1 answer

The heating of phenyl-methyl ethers with HI produces

asked Aug 21, 2018 by pady_1

1 answer

Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?

asked Aug 21, 2018 by pady_1

1 answer

Which of the following statements is not correct?

asked Aug 21, 2018 by pady_1

1 answer

The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is :

asked Aug 21, 2018 by pady_1

1 answer

The angle of incidence for a ray of light at a refracting surface of a prism is $45^o$. The angle of prism is $60^o$. If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism respectively, are :

asked Aug 21, 2018 by pady_1

1 answer

A particle of mass 10 g moves along a circle of radius 6.4 cm with a constant tangential acceleration. What is the magnitude of this acceleration if the kinetic energy of the particle becomes equal to $8 \times 10^{–4} J$ by the end of the second revolution after the beginning of the motion ?

asked Aug 21, 2018 by pady_1

1 answer

A refrigerator works between $4^oC$ and $30^oC$. It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is : (Take 1 cal = 4.2 Joules)

asked Aug 21, 2018 by pady_1

1 answer

When an $\alpha$-particle of mass 'm' moving with velocity 'v' bombards on a heavy nucleus of charge 'Ze', its distance of closest approach from the nucleus depends on m as :

asked Aug 21, 2018 by pady_1

1 answer

An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is :

asked Aug 21, 2018 by pady_1

1 answer

An inductor $20 \;mH$, a capacitor $50 \; \mu F$ and a resistor $40\; \Omega$ are connected in series across a source of emf $V = 10 \sin 340t$. The power loss in A.C. circuit is :

asked Aug 21, 2018 by pady_1

1 answer

A uniform rope of length $L$ and mass $m_1$ hangs vertically from a rigid support. A block of mass $m_2$ is attached to the free end of the rope. A transverse pulse of wavelength $\lambda_1$ is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top of the rope is $\lambda_2$. The ratio $\lambda_2/\lambda_1$ is :

asked Aug 21, 2018 by pady_1

1 answer

A small signal voltage $V(t )= V_0 \sin \omega t$ is applied across an ideal capacitor C :

asked Aug 21, 2018 by pady_1

1 answer

What is the minimum velocity with which a body of mass m must enter a vertical loop of radius R so that it can complete the loop ?

asked Aug 21, 2018 by pady_1

1 answer

A uniform circular disc of radius 50 cm at rest is free to turn about an axis which is perpendicular to its plane and passes through its centre. It is subjected to a torque which produces a constant angular acceleration of $2.0\; rad\; s^{–2}$ . Its net acceleration in $ms^{–2}$ at the end of 2.0 s is approximately :

asked Aug 21, 2018 by pady_1

1 answer

A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is : [Latent heat of ice is $3.4 \times 10^5 \;J/kg$ and $g = 10\; N/kg$]

asked Aug 21, 2018 by pady_1

1 answer

A particle moves so that its position vector is given by $\overrightarrow{r} = \cos \omega t \;\hat{x} + \sin \omega t \;\hat{y}$. Where $\omega$ is a constant. Which of the following is true ?

asked Aug 21, 2018 by pady_1

1 answer

Two identical charged spheres suspended from a common point by two massless strings of length l, are initially at a distance $d\; (d << l)$ apart because of their mutual repulsion. The charges begin to leak from both the spheres at a constant rate. As a result, the spheres approach each other with a velocity v. Then v varies as a function of the distance x between the spheres, as :

asked Aug 21, 2018 by pady_1

2 answers

A disk and a sphere of same radius but different masses roll off on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first ?

asked Aug 21, 2018 by pady_1

1 answer

If the velocity of a particle is v =$At + Bt^2$, where $A$ and $B$ are constants, then the distance travelled by it between 1s and 2s is :

asked Aug 21, 2018 by pady_1

1 answer

Match the corresponding entries of column 1 with column 2. [Where m is the magnification produced by the mirror] :

asked Aug 21, 2018 by pady_1

1 answer

A long straight wire of radius a carries a steady current $I$. The current uniformly distributed over its cross-section. The ratio of the magnetic fields $B$ and $B'$, at radial distance $\frac{a}{2}$ and $2a$ respectively, from the axis of the wire is :

asked Aug 21, 2018 by pady_1

1 answer

A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic process until its volume is again reduced to half. Then :

asked Aug 21, 2018 by pady_1

1 answer

A npn transistor is connected to common emitter configuration in a given amplifier. A load resistance of $800 \Omega$ is connected in the collector circuit and the voltage drop across it is $0.8\; V$. If the current amplification factor is $0.96$ and the input resistance of the circuit is $192 \Omega$, the voltage gain and the power gain of the amplifier will respectively be :

asked Aug 21, 2018 by pady_1

2 answers

An astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, the lenses must be separated by a distance :

asked Aug 21, 2018 by pady_1

1 answer

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