Recent questions tagged jeemain

The oxidation number of Mn in potassium permanganate is :

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The electronic configuration of sodium is :

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Which of the following reagents converts nitrobenzene into N-phenyl hydroxylamine ?

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Acetic acid gives acetic anhydride when treated with :

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Which of the following compounds undergo aldol condensation ?

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$O^{2-}$ and $Si^{4+}$ are isoelectronic ions. If the ionic radius of $O^{2-}$ is $1.4 \mathring{A}$, the ionic radius of $Si^{4+}$ will be :

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The solvent used in the preparation of Grignard reagent is :

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In which of the following reactions heat liberated is known as standard heat of formation of $CO_2$ ?

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Tinstone is contaminated with Wolframite. Which one of the following methods can be employed to dress the tinstone ore ?

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How many moles of potassium chlorate should be decomposed completely to obtain $67.2\; L$ of oxygen at NTP ?

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A solid organic compound $X$ on heating is directly converted into the vapour phase which on cooling solidifies. The best method for purifying $X$ is :

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A mixture contains $16\;g$ of oxygen, $28\; g$ of nitrogen and $8\; g$ of $CH_4$. Total pressure of mixture is $740\;mm$. What is the partial pressure of nitrogen in $mm$?

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Which of the following covalent molecules is an exception to octet rule ?

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Among the first lines of Lyman, Balmer, Paschen and Brackett series in hydrogen atomic spectra, which has the highest energy?

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At $90^{\circ}C$ the concentration of $H_3O^+$ in pure water is $10^{-6}\; mol\;L^{-1}$. What is the value of $K_w$ at this temperature ?

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The unit of radio-activity is :

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The pH of a 1 litre solution is 2. It is diluted with water till its pH becomes 4. How many litres of water are added ?

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The activity of a radioactive element is $2 \times 10^{10}$ disintegration per second. After ten minutes the activity is reduced to $2 \times 10^9$ distintegrations per second. The disintegration constant of the radioactive element is :

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n-octane and n-nonane have :

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The oxidation number of nitrogen in $NH_3$ is:

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Which of the following alkane cannot be prepared by Wurtz reaction ?

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Which of the following is used as a rocket fuel ?

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Ethyne is treated with $30 \% \; H_2SO_4$ in the presence of $1\%$ mercuric sulphate at $70^{\circ}C$. What is the product formed ?

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$\Delta x$ = (Hydration energy) - (Lattice energy), for a salt $\Delta x$ is found to be $500\;kcal\;mol^{-1}$. Then on increasing the temperature, its solubility in water :

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Chloroethane is treated with alc. KOH. The prooduct formed is :

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Chlorine is passed into dilute cold KOH solution. What are the oxidation number of chlorine in the products formed ?

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Hydrolysis of chloroform with aqueous KOH gives finally :

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The following reaction is known to occur in the body. If $CO_2$ escapes from the system : <br> $CO_2 + H_2O \leftrightharpoons H_2CO_3 \leftrightharpoons H^+ + HCO_3^-$

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The number of $C-C$ sigma bonds present in 1-butyne is :

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Which of the following pairs of ions contain the same number of unpaired electrons ?

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Absolute alcohol is prepared by distillation of rectified spirit in the presence of :

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The half-life of a first order reaction is 10 sec. What is its rate constant (in $sec^{-1}$) ?

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Which of the following set of raw materials are used in the manufacture of $Na_2CO_3$ by Solvay process ?

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At what temperature the density of heavy water will be maximum ?

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The number of acetylene molecules required to form one molecule of form one molecule of benzene is :

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The unit of electrochemical equivalent are :

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Which of the following is an oxide mineral ?

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What is the numerical value of the gas constant $R$ in $J\; mol^{-1}K^{-1} $ ?

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The molecule having zero dipole moment is :

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In Rutherford's $\alpha$-ray scattering experiment, the alpha particles are detected using a screen coated with :

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Which of the following is the anhydride of $HNO_3$ ?

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Inorganic benzene contains :

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A burnning strip of Mg is introduced inti a jar containing a gas. After sometime the walls of the container are coated with carbon. The gas in the container is :

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What is the oxidation state of Fe in the product formed when acidified potassium ferrocyanide is treated with $H_2O_2$ ?

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Which of the following is the weakest acid in its aqueous solution ?

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Oxalic acid is heated with $conc. H_2SO_4$ when the resultant gases are passed over red hot carbon, $X$ is obtained. $X$ is :

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Aqueous solution of carnallite gives positive test for :

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In which of the following reactions ozone acts as a reducting agent ?

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The industrial preparation of nitric acid by Ostwald's process involves :

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Which of the following is not true ?

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