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Dissolving 120 g of a compound of (mol. wt. 60) in 1000 g of water gave a solution of density 1.12 g/mL. The molarity of the solution is:
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The amount of oxygen in 3.6 moles of water is:
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The energy of an electron in first Bohr's orbit of H atom is $$-13.6$$ eV. The energy value of electron in the first excited state of Li$$^{2+}$$ is:
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In the following sets of reactants which two sets best exhibit the amphoteric character of Al$$_2$$O$$_3$$ · xH$$_2$$O?
Set I: Al$$_2$$O$$_3$$ · xH$$_2$$O$$_{(s)}$$ + OH$$^-_{(aq)}$$
Set II: Al$$_2$$O$$_3$$x · H$$_2$$O$$_{(s)}$$ + H$$_2$$O$$_{(l)}$$
Set III: Al$$_2$$O$$_3$$x · H$$_2$$O$$_{(s)}$$ + H$$^+_{(aq)}$$
Set IV: Al$$_2$$O$$_3$$ · xH$$_2$$O$$_{(s)}$$ + NH$$_{3(aq)}$$
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The number and type of bonds in C$$_2^{2-}$$ ion in CaC$$_2$$ are:
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Which of the following has unpaired electron(s)?
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The temperature at which oxygen molecules have the same root mean square speed as helium atoms have at 300 K is: (Atomic masses: He = 4 u, O = 16 u)
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Van der Waal's equation for a gas is stated as, $$P = \frac{nRT}{V - nb} - a\left(\frac{n}{V}\right)^2$$. This equation reduces to the perfect gas equation, $$P = \frac{nRT}{V}$$ When,
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The standard enthalpy of formation of NH$$_3$$ is $$-46.0$$ kJ/mol. If bond enthalpy of H$$_2$$ is $$-436$$ kJ/mol and that of N$$_2$$ is $$-712$$ kJ/mol, the average bond enthalpy of N$$-$$H bond in NH$$_3$$ is:
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At a certain temperature, only 50% HI is dissociated into H$$_2$$ and I$$_2$$ at equilibrium. The equilibrium constant is:
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In which of the following pairs is A more stable than B?
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In a face centered cubic lattice atoms A are at the corner points and atoms B at the face centered points. If atom B is missing from one of the face centered points, the formula of the ionic compound is:
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A current of 10.0 A flows for 2.00 h through an electrolytic cell containing a molten salt of metal X. This results in the decomposition of 0.250 mol of metal X at the cathode. The oxidation state of X in the molten salt is: (F = 96,500 C)
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The standard electrode potentials ($$E^\circ_{M^{+}/M}$$) of four metals A, B, C and D are $$-1.2$$ V, 0.6 V, 0.85 V and $$-0.76$$ V, respectively. The sequence of deposition of metals on applying potential is:
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The half-life period of a first-order reaction is 15 minutes. The amount of substance left after one hour will be:
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The form of iron obtained from blast furnace is:
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The gas evolved on heating CaF$$_2$$ and SiO$$_2$$ with concentrated H$$_2$$SO$$_4$$, on hydrolysis gives a white gelatinous precipitate. The precipitate is:
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Which of the following is not formed when H$$_2$$S reacts with acidic K$$_2$$Cr$$_2$$O$$_7$$ solution?
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The correct statement about the magnetic properties of [Fe(CN)$$_6$$]$$^{3-}$$ and [FeF$$_6$$]$$^{3-}$$ is: (Z = 26).
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A compound of vanadium chloride has spin only magnetic moment of 1.73 BM. Its formula is:
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An octahedral complex of Co$$^{3+}$$ is diamagnetic. The hybridisation involved in the formation of the complex is:
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Allyl phenyl ether can be prepared by heating:
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For the compounds CH$$_3$$Cl, CH$$_3$$Br, CH$$_3$$I and CH$$_3$$F, the correct order of increasing C-halogen bond length is:
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In a nucleophilic substitution reaction: R $$-$$ Br + Cl$$^-$$ $$\xrightarrow{DMF}$$ R $$-$$ Cl + Br$$^-$$, which one of the following undergoes complete inversion of configuration?
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In the hydroboration-oxidation reaction of propene with diborane, H$$_2$$O$$_2$$ and NaOH, the organic compound formed is:
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Which is the major product formed when acetone is heated with iodine and potassium hydroxide?
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Which one of the following reactions will not result in the formation of carbon-carbon bond?
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The major product of the reaction is:
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Structure of some important polymers are given. Which one represents Buna-S?
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Which one of the following class of compounds is obtained by polymerization of acetylene?
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