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| VALUABLE CHEMISTRY MCQ |
a) O b) F c) N d) none of these
2. N2O4 is 27 % dissociated at 308K and 1 atm pressure . The Kp would be :
a) 0.3145 atm b) 31.45 atm c) 3.145 atm d) 3145 atm
3. The set of quantum numbers not applicable to an electron :
a) 2 , 0 , 0 , + 1/2 b) 1 , 0 , 0 , -- 1/2 c) 1, 1, 1 , +1/2 d) 1 ,0 , 0 , + 1 /2
4. Benzene on catalytic oxidation with air in the presence of heated V2O5 gives :
a) malic anhydride b) malonic acid c) fumaric acid d) maleic acid
5. Calculate the radius of anucleus of an atom having mass number 216 . Given R0 = 1.40 x10⁻¹³ cm
a) 4.8 fermi b) 7.8 fermi c) 10.2 fermi d) 8.4 fermi
6. The lighest liquid metal is :
a) Hg b) Na c) Cs d) Fr
7. Selenium dioxide oxidises alkynes to give :
a) aldehyde b) ketone c) dialdehyde d) diketones
8. the half-life of radium (226 ) is 120 years. The time taken to convert 10g of radium to 1.25 g is :
a) 120 years b) 240 years c) 360 years d) 60 years
9. Among the following the achiral amino acid is :
a) 2 -ethylalanine b) 2 -methylglycine c) 2-hydroxymethyl serine d) trytopham
10. Euchlorine is a mixture of :
a) Cl2 and CO2 b) Cl2 and SO2 c) Cl2 and ClO2 d) none of these
11. The bonds present in N2O5 are :
a) covalent and ionic b) only covalent c) only ionic d) covalent and coordinate
12. Difference in density is the basis of :
a) ultrafilteration b) molecular attraction c) gravity separation d) molecular seiving
13. Which is not true about cathode rays :
a) A stream of electrons b) Charged particles c) Move with speed same as that of light
d) Can be deflected by magnetic field .
14. Unstable substances exhibit higher radioactivity due to :
a) low p / n ratio b) high p / n ratio c) p / n = 1 d) none of the above
15. The shape of gaseous SnCl2 is :
a) angular b) linear c) tetrahedral d) T-shaped
16. In order to prepare 11 normal solution of KMnO4 , how many grams of KMnO4 are required if the solution is used in acidic medium for oxidation ?
a) 158 g b) 31.6 g c) 790 g d) 62 g
17. Potassium crystalizes in a bcc lattice , hence the coordination number of potassium in potassium metal
is :
a) 0 b) 4 c) 6 d) 8
18. At STP the order of mean square velocity of molecules of H2 , N2 , O2 and HBr is :
a) H2 > N2> O2 > HBr b) HBr> O2 > N2 > H2 c) HBr > H2 > O2 > N2
d) N2 > O2 > H2 > HBr
19. For a 1 molar solution of NaCl in water at 25*C and 1 atm pressur :
a) molarity = normality b) molality = normality c) molality = mole fraction
d) molarity = mole fraction
20. when two reactants A and B are mixed to give products C and D . The reaction quotient Q at the
initial stages of the reaction :
a) is zero b) increase with time c) is independent of time d) decrease with time
21. 0.765g of an acid gives 0.535 g of CO2 and 0.12 g of H2O . Then the ration of the percentage of
carbon and hydrogen is :
a) 19 : 2 b) 18 : 11 c) 20 : 17 d) 1 : 7
22. The pesticide DDT slowly changes to :
a) CCl3CHO and chlorobenzene b) p - p - dichlorodiphenylene c) p,p - dichlorodiphenyl
dichloroethane d) p , p - dichlorodiphenyl dichloroethene
23. Ethanol when reacted with PCl5 gives A , POCl3 and HCl . A reacts with silver nitrite to form B (major
product ) and AgCl . A and B are respectively :
a) C2H5Cl and C2H5OC2H5 b) C2H6 and C2H5OC2H5 c) C2H5Cl and C2H5NO2
d) C2H6 and C2H5NO2
24. The ether that undergoes electrophillic substitution reactions is :
a) CH3OC2H5 b) C2H5OCH3 c) CH3OCH3 d) C2H5OC2H5
25. Acetophenone can be prepared by :
a) oxidation of 1- phenylethanol b) reaction of benzaldehyde with methyl magnesium bromide
c) Friedel -Craft reaction of benzene with acetyl chloride
d) Distillation of calcium benzoate
Which of the above statements are correct ?
a) II and III b) I and IV c) I and III d) III and IV
26.Steel is heated to a bright red heat and then cooled slowly . It is :
a) hardening b) annealing c) tempering d) nitriding
27. EKa - aluminium and EKa - silicon are known as :
a) gallium and germanium b) aluminium and silicon c) iron and sulphur d) proton and silicon
28. Elements of s and p - block are called :
a) normal b) representative c) both of these d) none of these
29. Action of water of dilute mineral acids on metals can give :
a) monohydrogen b) tritium c) dihydrogen d) trihydrogen
30. The degree of hardness of a sample of water containing 30 ppm of MgSO4 is :
a) 30 ppm b) 25 ppm c) 20 ppm d) 10 ppm
31. The process of converting hydrated alumina into anhydrous alumina is called :
a) roasting b) smelting c) dressing d) calcination
32. The Solvay process of manufacture of Na2CO3 the byproducts are :
a) CaO , Na2CO3 b) CaCl2. CO2.NH3 c) NH4Cl. CaO d) Na2CO3.CO2
33. Litharge is chemically :
a) PbO b) PbO2 c) Pb3O4 d) Pb(CH3COO)2
34. The pH value of ordinary water is :
a) 7 b) 6.5 c) 5.3 d) 7.8
35. 1000 g of calcium carbonate solution contains 10g carbonate . The concentration of solution is :
a) 10 ppm b) 100 ppm c) 1000 ppm d) 10,000 ppm
36. Propan - 1 -ol can be prepared from propene by :
a) H2O / H2SO4 b) Hg(OAc)2 / H2O followed by NaBH4 c) B2H6 followed by H2O2
d) CH3CO2H / H2SO4
37. What will be the emf for the given cell Pt / H2 (P1 ) l H+ ( aq ) l H2 (P2 ) l Pt ?
a) RT / F ln P1 / P2 b) RT / 2F ln P1/P2 c) RT / F ln P2 /P1 d) RT / 2F ln P2/P1
38. Cassiterite is an ore of :
a) Sn b) Cu c) Si d) Ca
39. Which of the following is most volatile ?
a) CH4 b) SiH4 c) GeH4 d) SnH4
40. Turnbull's blue is :
a) ferricyanide b) ferrous ferrocyanide c) ferrouscyanide d) ferriferrocyanide
41. In the exothermic reaction the enthalpy of reaction is always :
a) Zero b) positive c) negative d) none of these
42. Which of the following is not considered as an organometallic compound ?
a) Cis - platin b) Ferrocene c) Ziese's salt d) Grignard reagent
43. The normality of orthophosphoric acid having purity of 70% by weight and specific gravity 1.54 is :
a) 11 N b) 22 N c) 33 N d) 44 N
44. Which of the following compounds exhibits stereoisomerism ?
a) 2 methyl butene - 1 b) 3 -methyl butyne - 3 c) 3 - methyl butanoic acid
d) 2 - methyl butanoic acid
45. The phenomenon in which white transparent crystal changes into white powder is called :
a) deliquescence b) efflorescence c) allotrophy d) Sublimation
ALL THE BEST
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