Practice Questions

Q41.Which of the following on thermal decomposition yields a basic as well as an acidic oxide ? (1) NaNO3 (2) KClO3 (3) CaCO3 (4) NH4NO3

Q42.Maleic acid and fumaric acids are (1) Chain isomers (2) Functional isomers (3) Tautomers (4) Geometrical isomers

Q43.Copper wire test for halogens is known as (1) Duma's Test (2) Beilstein's Test (3) Liebig's Test (4) Lassigne's Test

Q44.What is DDT among the following : (1) Greenhouse gas (2) A fertilizer (3) Biodegradable pollutant (4) Non-biodegradable pollutant

Q45.Beilstein test is used for the estimation of which one of the following elements? (1) S (2) Cl (3) C and H (4) N

Q45.The reaction, CH3CHO Zn(Hg)/[H]Conc. HCl CH3CH3 (1) Cannizaro's reaction (2) Rosenmund reduction (3) Wolf-Kishner reduction (4) Clemmenson reduction

Q45.Lithium forms body centred cubic structure. The length of the side of its unit cell is 351pm. Atomic radius of the lithium will be: (1) 75 pm (2) 300 pm (3) 240 pm (4) 152 pm

Q45.Which one of the following depletes ozone layer? (1) CO (2) NO and freons (3) SO2 (4) CO2

Q46.Water sample is reported to be highly polluted if BOD (Biological Oxygen Demand) value of sample becomes (1) more than 17ppm (2) equal to 10ppm (3) equal to 5ppm (4) less than 5ppm

Q47.Among the following which is the best description of water in the solid phase? (1) Covalent solid (2) Molecular solid (3) Ionic solid (4) Network solid

Q49.The ppm level of F− in a 500 g sample of a tooth paste containing 0.2 g F− is (1) 400 (2) 1000 (3) 250 (4) 200

Q49.According to Freundlich adsorption isotherm, which of the following is correct ? (1) m x ∝P 0 (2) mx ∝p1 (3) x ∝p1/n (4) All the above are correct for different ranges of m pressure

Q50. K1, K2 and K3 are the equilibrium constants of the following reactions (I), (II) and (III) respectively: (I) N2 + 2O2 ⇌2NO2 (II) 2NO2 ⇌N2 + 2O2 (III) NO2 ⇌12 N2 + O2 The correct relation from the following is (1) K1 = 1 = 1 (2) K1 = 1 = 1 K2 K3 K2 (K3)2 (3) K1 = √K2 = K3 (4) K1 = 1 = K3 K2

Q50.Which method of purification is represented by the following equation: 523 K 1700 K Ti(s) + 2I2(g) ⟶TiI4(g) ⟶Ti(s) + 2I2(g) (1) zone refining (2) cupellation (3) Poling (4) Van Arkel

Q50.Colloidal solutions can be purified by JEE Main 2012 (26 May Online) JEE Main Previous Year Paper (1) emulsification (2) electrodialysis (3) peptization (4) using Tyndall effect

Q51.The substance used as froth stabilisers in forth-floatation process is (1) Potassium ethyl xanthate (2) Aniline (3) Sodium cyanide (4) Copper sulphate

Q51.The correct statement for both the processes of physisorption and chemisorption is JEE Main 2012 (12 May Online) JEE Main Previous Year Paper (1) both are endothermic (2) chemisorption is endothermic but physisorption is exothermic (3) both are exothermic (4) physisorption is endothermic but chemisorption is exothermic.

Q51.Fog is a colloidal solution of (1) solid particles dispersed in gas (2) solid particles dispersed in a liquid (3) liquid particles dispersed in gas (4) gaseous particles dispersed in a liquid

Q52.If x is the mass of the gas adsorbed on mass m of the adsorbent at pressure p, Freundlich adsorption isotherm gives a straight line on plotting (1) x/m vs p (2) x/m vs 1/p (3) log x/m vs log p (4) log x/m vs p

Q52.In the electrolysis of alumina to obtain aluminium metal, cryolite is added mainly to (1) lower the melting point of alumina (2) dissolve alumina in molten cryolite (3) remove the impurities of alumina (4) increase the electrical conductivity

Q54.The correct order of ligands in the spectrochemical series is (1) Cl−>en > CN−> NCS− (2) CN−>en > NCS−> Cl− (3) NCS−> CN−> Cl−>en (4) en > CN−> Cl−> NCS−

Q55.Which of the following compounds can be detected by Molisch's test ? (1) Nitro compounds (2) Sugars (3) Amines (4) Primary alcohols

Q56. In the given reaction, the product 'A' is JEE Main 2012 (12 May Online) JEE Main Previous Year Paper (1) (2) (3) (4)

Q57.The conversion of benzene diazonium chloride to bromobenzene can be accomplished by (1) Reimer-Tiemann reaction (2) Friedel-Crafts reaction (3) Gattermann reaction (4) Azo-coupling reaction

Q57.Tollen's reagent and Fehling solutions are used to distinguish between (1) acids and alcohols (2) alkanes and alcohols (3) ketones and aldehydes (4) n-alkaens and branched alkanes