The region in the electromagnetic spectrum where the Balmer series lines appear is:
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The region in the electromagnetic spectrum where the Balmer series lines appear is:
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The elements with atomic numbers 101 and 104 belong to, respectively:
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The ionic radii of $$O^{2-}$$, $$F^-$$, $$Na^+$$ and $$Mg^{2+}$$ are in the order:
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The intermolecular potential energy for the molecules A, B, C and D given below suggests that:
For one mole of an ideal gas, which of these statements must be true?
(a) Internal energy (U) and enthalpy (H) each depends on temperature.
(b) Compressibility factor Z is not equal to 1
(c) $$C_{P,m} - C_{V,m} = R$$
(d) $$dU = C_v dT$$ for any process
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On combustion of Li, Na and K in excess of air, the major oxides formed, respectively, are:
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On heating, lead (II) nitrate gives a brown gas (A). The gas (A) on cooling changes to a colourless solid/liquid (B). (B) on heating with NO changes to a blue solid (C). The oxidation number of nitrogen in solid (C) is:
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The IUPAC name of the following compound is:
The decreasing order of reactivity of the following organic molecules towards AgNO$$_3$$ solution is:
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Identify the incorrect statement from the options below for the above cell:
$$E^0_{Cu^{2+}|Cu} = +0.34$$ V,
$$E^0_{Zn^{2+}|Zn} = -0.76$$ V
For the equilibrium $$A \rightleftharpoons B$$, the variation of the rate of the forward (a) and reverse (b) reaction with time is given by:
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Match the following:
(i) Foam (a) smoke
(ii) Gel (b) cell fluid
(iii) Aerosol (c) jellies
(iv) Emulsion (d) rubber
(e) froth
(f) milk
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Among statements (a) - (d), the correct ones are:
(a) Lime stone is decomposed to CaO during the extraction of iron from its oxides.
(b) In the extraction of silver, silver is extracted as an anionic complex.
(c) Nickel is purified by Mond's process.
(d) Zr and Ti are purified by Van Arkel method.
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The number of isomers possible for $$[Pt(en)(NO_2)_2]$$ is:
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The pair in which both the species have the same magnetic moment (spin only) is:
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An organic compound (A) (molecular formula $$C_6H_{12}O_2$$) was hydrolysed with dil. $$H_2SO_4$$ to give a carboxylic acid (B) and an alcohol (C). 'C' gives white turbidity immediately when treated with anhydrous $$ZnCl_2$$ and conc. HCl. The organic compound (A) is:
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When neopentyl alcohol is heated with an acid, it slowly converted into an 85:15 mixture of alkenes A and B, respectively. What are these alkenes?
[P] on treatment with $$Br_2/FeBr_3$$ in $$CCl_4$$ produced a single isomer $$C_8H_7O_2Br$$ while heating [P] with sodalime gives toluene. The compound [P] is:
Which of the following will react with $$CHCl_3$$ + alc. KOH?
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What are the functional groups present in the structure of maltose?
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The mass of ammonia in grams produced when 2.8 kg of dinitrogen quantitatively reacts with 1 kg of dihydrogen is __________
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A 20.0 mL solution containing 0.2 g impure $$H_2O_2$$ reacts completely with 0.316 g of $$KMnO_4$$ in acid solution. The purity of $$H_2O_2$$ (in %) is __________ (mol. wt. of $$H_2O_2$$ = 34; mol. wt. of $$KMnO_4$$ = 158)
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At 300 K, the vapour pressure of a solution containing 1 mole of n-hexane and 3 moles of n-heptane is 550 mm of Hg. At the same temperature, if one more mole of n-heptane is added to this solution, the vapour pressure of the solution increases by 10 mm of Hg. What is the vapour pressure in mmHg of n-heptane in its pure state?
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If 75% of a first order reaction was completed in 90 minutes, 60% of the same reaction would be completed in approximately (in minutes) __________ (Take: log 2 = 0.30; log 2.5 = 0.40)
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The number of chiral centres present in [B] is __________
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