Q. Amorphous solids are:(a) isotropic(b)anisotropic(c) isotopic(d) isomeric Answer: (a) isotropic Amorphous solids are: (a) isotropic (the value of any physical property is same along any direction)
Amorphous solids are: (a) isotropic (b)anisotropic (c) isotopic (d) isomeric Read More »
Q. During dehydration of alcohols to alkenes by heating with concentrated H2SO4, the initiation step is:(a) protonation of alcohol molecule(b) formation of carbocation(c) elimination of water(d) formation of an ester Answer: (a) protonation of alcohol molecule
Q. Chlorine water loses its yellow colour on standing because:(a) HCl gas is produced, due to the action of sunlight.(b) a mixture of HOCl and HCl is produced in the presence of light(c) HOCl and hydrogen gas is produced(d) a mixture of HCl and ClO3 is produced, due to the action of sunlight Answer: (b)
Chlorine water loses its yellow colour on standing because Read More »
Q. Williamson’s synthesis of preparing dimethyl ether is an:(a) SN1 reaction(b) Elimination reaction(c) SN2reaction(d) Nucleophilic addition reaction Answer: (c) SN2 reaction (alkoxide ion reacts with primary alkyl halide in a single step to form ether)
Williamson’s synthesis of preparing dimethyl ether is an: Read More »
Q. Which one of the following reactions is not explained by the open chain Structure of glucose:(a) Formation of pentaacetate of glucose with acetic anhydride.(b) formation of addition product with 2,4 DNP reagent(c) Silver mirror formation with Tollen’s reagent(d) existence of alpha and beta forms of glucose. Answer: (d) existence of alpha and beta forms
Q. Which of the following isomer has the highest meltingpoint:(a) 1,2-dicholorbenzene(b) 1,3 -dichlorobenzene(c) 1,4-dicholorbenzene(d) all isomers have same melting points Answer: (c) 1,4-dicholorbenzene ( para isomers are more symmetric and ortho and meta )
Q. Pink colour of LiCl crystals is due to:(a) Schottky defect(b)Frenkel defect(c) Metal excess defect(d) Metal deficiency defect Answer: (c) Metal excess defect
Q. Identify the law which is stated as:“For any solution, the partial vapour pressure of each volatile component in the solution is directly proportional to its mole fraction.”(a)Henry’s law(b) Raoult’s law(c)Dalton’s law(d)Gay-Lussac’s Law Answer: (b) Raoult’s law
Q. Which of the following is a non-stoichiometric defect?(a)Frenkel defect(b)Schottky defect(c)metal deficiency defect(d)interstitial defect Answer: (c)metal deficiency defect (anion is missing from lattice site) In Frenkel defect the smaller ion occupies the interstitial sites and Schottky defect equal number of cations and anions are missing. Interstitial defect an atom or molecule occupies intestinal sites so
Q. Which of the following statements is true: (a)Melting point of Phosphorous is less than that of Nitrogen(b)N2 is highly reactive while P4 is inert(c)Nitrogen shows higher tendency of catenation than P(d)N-N is weaker than P-P Answer: (d)N-N is weaker than P-P other statements as incorrect as Phosphorus has a higher melting point due to