Recent questions tagged past papers

Iron carbonyl, $Fe(CO)_5$ is

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Match the metal ions given in Column I and the spin magnetic moments of the ions given in Column II and assign the correct code :

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Compound A, $C_8 H_{10}O$, is found to react with $NaOI$ (produced by reacting Y with NaOH) and yield a yellow precipitate with characteristic smell. A and Y are respectively

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Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their

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In the reaction The electrophile involved is

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Which one of the following elements is unable to form $MF_6^{3-}$ ion ?

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The correct order of N-compounds in its decreasing order of oxidation states is

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In the structure of $CIF_3$, the number of Ione pair of electrons on central atom 'Cl' is

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The correct order of atomic radii in group 13 elements is

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Considering Ellingham diagram, which of the following metals can be used to reduce alumina ?

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Which of the following statements is not true for halogen ?

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

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Which one is a wrong statement ?

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Iron exhibits bcc structure at room temperature. About $900^oC$, it transforms to fcc structure. The ratio of density of iron at room temperature to that at $900^oC$ (assuming molar mass and atomic radii of iron remains constant with temperature) is

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Magnesium reacts with an element (X) to form an ionic compoun. If the ground state electronic configuration of (X) is $1s^2 2s^2 2p^3$, the simplest formula for this compound is

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Which of the followng carbocations is expected to be most stable ?

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Which of the following molecules represents the order of hybridisation $sp^2, sp^2, sp, sp$ from left to right atoms?

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Which of the following is correct with reapect to -I effect of the substituents ? (R = alkyl)

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The correct difference between first and second order reactions is that

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In which case in number of molecules of water maximum ?

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Among $CaH_2, BeH_2, BaH_2$, the order of ionic character is

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Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below : $BrO_4^- \xrightarrow{1.82 V} BrO_3^- \xrightarrow{1.5 V} HBrO \xrightarrow{1.595 V} Br_2 \xrightarrow{1.0652 V} Br^-$ Then the species undergoing disproportionation is

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Which one of the following conditions will favour maximum formation of the product in the reaction, $A_2 (g) + B_2 (g) \rightleftharpoons X_2 (g) \Delta_f H = - X\;kJ$ ?

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For the redox reaction $MnO_4^- + C_2O_4^{2-} + H^+ \to Mn^{2+} + CO_2 + H_2O$ The correct coefficients of the reactants for the balanced equation are

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The correction factor 'a' to the ideal gas equation corresponds to

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When initial concentration of the reactant is doubled, the half-life period of a zero order reaction

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The bond dissociation energies of $X_2, Y_2$ and $XY$ are in the ratio of 1 : 0.5 : 1. $\Delta H$ for the formation of $XY$ is $-200\; kJ \;mol^{-1}$. The bond dissociation energy of $X_2$ will be :

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Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?

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The compound $C_7H_8$ undergoes the following reactions: $C_7H_8 \xrightarrow{3Cl_2/ \Delta} A \xrightarrow{Br_2/Fe} B \xrightarrow{Zn/ HCl} C$ The product 'C' is

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Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is

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The compound A on treatment with Na gives B, and with $PCl_4$ gives C, B and C react together to give diethyl ether. A, B and C are in the order

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Nitrogen of aniline in strong acidic medium also gives m-nitroaniline because

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Regarding cross-linked or network polymers, which of the following statements is incorrect ?

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A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. $H_2SO_4$. The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP wil be

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The diffrence between amylose and amylopectin is

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Which of the following oxides is most acidic in nature ?

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When the light of frequency $2v_o$ (where $v_0$ is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is $v_1$. When the frequency of the incident radiation is increased to $5v_0$, the maximum velocity of eletrons emitted from the same plate is $v_2$. The ratio of $v_1$ to $v_2$ is

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The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is

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For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is

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An electron of mass m with an initial velocity $\overrightarrow{V} = V_0 \hat{i} (V_0 > 0) $ enters an electric field $\overrightarrow{E} = -E_0 \hat{i} (E_0 = constant > 0)$ at $t = 0$. If $\lambda_0$ is its de-Broglie wavelength initially, then its de-Broglie wavelength at time t is :

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A small sphere of radius 'r' falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity, is proportional to

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The power radiated by a black body is P and it radiates maximum energy at wavelength, $\lambda_0$. If the temperature of the black body is now changed so that it radiates maximum energy at wavelength $\frac{3}{4} \lambda_D$, the power radiated by it becomes nP. The value of n is

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A sample of 0.1 g of water at $100^oC$ and normal pressure ($1.013 \times 10^5 Nm^{-2}$) requires 54 cal of heat energy to convert to steam at $100^oC$. If the volumn of the steam produced is 167.1 cc, the change in internal energy of the sample, is

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Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If the length of the first wire is increased by $\Delta x$ on applying a force F, how much forcce is needed to stretch the second wire by the same amount ?

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A body initially at rest and sliding along a frictionless track from a height h (as shown in the figure) just completes a vertical circle of diameter AB = D. The height h is equal to

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A moving block having mass m, collides with another stationary block having mass 4m. The lighter block comes to rest after collision. When the initial velocity of the lighter block is v, then the value of coefficient of restitution (e) will be

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Three objects, A : (a solid sphere), B : (a thin circular disk) and C : (a circular ring), each have the same mass M and radius R. They all spin with the same angular speed $\omega$ about their own symmetry axes. The amounts of work (W) required to bring them to rest, would satisfy the relation

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Which one of the following statements is incorrect ?

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A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero error of -0.004 cm, the correct diameter of the ball is

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The moment of the force, $\overrightarrow{F} = 4 \hat{i} + 5 \hat{j} - 6 \hat{k}$ at (2, 0, -3) about the point (2, -2, -2), is given by

asked Aug 21, 2018 by pady_1

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