Recent questions in JEEMAIN PAST PAPERS

Two consecutive sides of a parallelogram are $4x+5y=0$ and $7x+2y=0$. If the equation of one diagonal is $11x + 7y =9$, then the equation of the other diagonal is :

asked Dec 19, 2018 by pady_1

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Which of the following is a tertiary alcohol ?

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Which of the following is Lucas reagent ?

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Chloroethane reacts with Y to form NaCl and Z. One mole of Z reacts with two moles of Hi to form water and iodo ethane. Which of the following is Y ?

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Which of the following is a secondary amine ?

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Which of the following converts acetone to acetone oxime ?

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Nitrobenzene on reduction with $Sn/HCl$ gives $A$, which on reaction with acetyl chloride form $B$. Which of the following is $B$ ?

asked Dec 19, 2018 by pady_1

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Which of the following converts acetic acid into acetyl chloride?

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What is X in the following reaction ? <br> $2CH_3CHO \xrightarrow{NaOH} X$ :

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What is the crystal structure of caesium chloride ?

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Which of the following is the correct pair ?

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Which of the following has the highest first IP ?

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The electronic configuration of group III elements is :

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The pH of an aqueous solution of a salt is 10. The salt is :

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Which of the following is correct for acid buffer ? [ salt = S, acid = A ] :

asked Dec 19, 2018 by pady_1

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What is the value (in litres) of $CO_2$ liberated at $STP$ when $2.12 \;g$ of sodium carbonate (mol. wt. 106) is treated with excess dilute $HCl$ ?

asked Dec 19, 2018 by pady_1

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Which of the following reactions does not involve change in the oxidation state of the metal ?

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I low many electrons are present in the $M$ shell of an atom of an element with atomic number 24 (Z = 24) ?

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The half-life of a radioactive element is 100 years. What is its disintegration contant (in years$^{-1}$) ?

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Which one of the $VI$ group element has the highest catenation power ?

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Brass is an alloy of :

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In which of the following reactions $H_2O_2$ acts as a reducing agent ?

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In the Castner's process of extraction of sodium, cathode is :

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Which is the molecular formula of gypsum ?

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Which of the following is used in the preparation of generated water (soda) ?

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What is the appromiate calorific value of water gas in $kcal\; m^{-3}$ ?

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Which of the following is an acid?

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What is the molecular formula of white phosphorus ?

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During Serpeck's process silica is eliminated as :

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Which of the following reacts with $BCl_3$ to form diborane ?

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Which of the following react with water to give ethane ?

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Which of the following hydrocarbon has least carbon-carbon bond length ?

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Which of the following reacts with ammonical cuprous chloride ?

asked Dec 19, 2018 by pady_1

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Ethylene reacted with bromine in $CCl_4$ to form $X$. $X$ is treated with alcoholic $KOH$ to give $Y$. $X$ and $Y$ are respectively :

asked Dec 19, 2018 by pady_1

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Chloroethane reacts with magnesium in dry ether to form $X$. When $X$ is hydrolysed a carbon compound $Y$ and $Z$ are formed. Which of the following is $Y$?

asked Dec 19, 2018 by pady_1

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A solid organic compound $Y$ on heating is converted into vapour directly; which on cooling solidifies, which of the following is the correct method of purifying it ?

asked Dec 19, 2018 by pady_1

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What is the approximate quantity of electricity (in coulomb) required to deposit all the silver from $250\;mL$ of $1M\; AgNO_3$ aqueous solution ?

asked Dec 19, 2018 by pady_1

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The equilibrium constant for the reaction $H_{2(g)} + I_{2(g)} \leftrightharpoons 2HI_{(g)}$ is $64$ at a certain temperature. The equilibrium concentrations of $H_2$ and $HI$ are $2\;mol/L$ and $16\; mol/L$ respectively. What is the equilibrium concentrations (in $mol/L$) of $I_2$ ?

asked Dec 19, 2018 by pady_1

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What is the catalyst used in the manufacture of sulphuric acid by contact process ?

asked Dec 19, 2018 by pady_1

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What are the values of $n_1$ and $n_2$ for the 2nd line in the Lyman series of hydrogen atomic spectrum ?

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Which of the following is the isotope of $Ge_{32}^{76} $ ?

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Which of the following has the lowest bond angle ?

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What is the oxidation state of chlorine in hypoclorous acid ?

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Which of the following is the strongest oxidising agent ?

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Which of the following ions is colourless in aqueous solution ?

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Which of the following is a sulphide ore ?

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Calculate the heat of the formation $(\Delta H)$ of $CO$ (in kcal) from the following data : <br> $I. \; C_{(graphite)} + O_{2(g)} \to CO_{2(g)} \; \; \; \; \; \; \Delta H = -94 \; kcal$ <br> $II. \; CO_{(g)} + \frac{1}{2}O_{2(g)} \to CO_{2(g)} \; \; \; \;\; \; \Delta H = -68\; kcal $

asked Dec 19, 2018 by pady_1

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The r.m.s velocity of an ideal gas at $300\; K$ is $12240\; cm/sec$. What is the most probable velocity at that temperature ?

asked Dec 19, 2018 by pady_1

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The total pressure of a mixture of 6.4 of $O_2$ and 5.6 g of $N_2$ present in a 2 litre vessel is $1200\;mm$. What is the partial pressure (in mm) of nitrogen ?

asked Dec 19, 2018 by pady_1

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A non-volatile solute (A) is dissolved in a volatile solvent (B). The vapour pressure of the resultant solution is $P_S$. The vapour pressure of pure solvent is $P_B$. If $X_B$ is the mole fraction of the solvent which of the following is correct :

asked Dec 19, 2018 by pady_1

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