46829.Natural rubber has
alternate cis-and trans-configuration
random cis-and trans-configuration
all cis-configuration
all trans-configuration
46830.The pyknometric density of sodium chloride crystal is 2.165x10^3 kg$m^{-3}$ while its X-ray density is 2.178x$10^3 kgm^{-3}$ ?. The fraction of unoccupied sites in sodium chloride crystal is
5.96x$10^{-1} $
5.96x$10^{-3}$
5.96
5.96x$10^{-2}$
46831.The pH of 0.1 M solution of the following salts increases in the order
NaCl < NH4Cl < NaCN < HCI
HCl < $NH_4Cl$ < NaCl < NaCN
NaCN < $NH_4Cl$ < NaCl < HCI
HCl < NaCl < NaCN < $NH_4Cl$
46832.Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy ?
$CaSO_4$
$BeSO_4$
$BaSO_4$
ICI
46833.A substance A,B, crystallises in a face centred cubic (fcc) lattice in which atoms A occupy each corner of the cube and atoms B occupy the centres of each face of the cube. Identify the correct composition of the substance $A_xB_y$
$AB_3$
$A_4B_3$
$A_3B$
composition cannot be specified
46834.Which of the following is a sink for CO?
Haemoglobin
Microorganism present in the soil
Oceans
Plants
46836.Which of the following compounds will exhibit geometrical isomerism ?
1-phenyl-2-butene
3-phenyl-1-butene
2-phenyl-1-butene
1,1-diphenyl-1-propene
46837.The longest wavelength of Het in Paschen series in “m”, then shortest wavelength of $Be^{+3}$ in Paschen series is (in terms of m):
$\dfrac{5}{36}m$
$\dfrac{53}{8}m$
$\dfrac{64}{7}m$
$\dfrac{7}{64}m$
46838.Which one of the following orders represents the correct sequence of increasing basic nature of the given oxides?
$Al2O_3 < Mgo < Na_2O < K_2O$
$MgO < K_20 < Al_2O_3 < Na_2O$
$Na_2O < K_2O < MgO < Al_2O_3$
$K_2O < Na_2O < Al_2O_3 < Mgo$
46839.The most suitable method of separation of 1 : 1 mixture of ortho-and para-nitrophenols is
chromatography
crystallisation
steam distillation
sublimation
46840.In which of the following pairs of molecules/ions both the species are not likely to exist?
$H^+_2, He^{2-}_2$
$H^-_2+, He^{2-}_2$
$H^{2+}_2 , He_2$
$H^-_2, , He^{2+}_2$
46841.Consider the following liquid-vapour equilibrium
Liquid $\rightleftharpoons$ Vapour
Which of the following relations is correct ?
Liquid $\rightleftharpoons$ Vapour
Which of the following relations is correct ?
$\dfrac{dInP}{dT} = \dfrac{-\triangle H_v}{RT}$
$\dfrac{dInP}{dT^2} = \dfrac{-\triangle H_v}{T^2}$
$\dfrac{dInP}{dT} = \dfrac{-\triangle H_v}{RT^2}$
$\dfrac{dInG}{dT^2} = \dfrac{-\triangle H_v}{RT^2}$
46842.If uranium (mass number 238 and atomic number 92) emits an a-particle, the product has mass number and atomic number.
236 and 92
234 and 90
238 and 90
236 and 90
46843.Which of the following arrangements does not represent the correct order of the property stated against it?
$Co^{3+} < Fe^{3+} < Cr^{3+} < Sc^{3+}$ : stability in aqueous solution
$Se < Ti < Cr < Mn $: number of oxidation states
$V^{2+} < Cr^{2+} < Mn^{2+} < Fe^{2+} $: paramagnetic behaviour
$Ni^{2+} < Co^{2+} < Fe^{2+} < Mn^{2+} $: ionic size
46844.Which of the following does not show optical isomerism? (en = ethylenediamine)
$[Co(en)_2Cl_2]^+ $
$[Co(NH_3)_3C1_3]^°$
$[Co(en)Cl_2(NH_3)_2]^+ $
$[Co(en)_3]^{3+}$
46845.Select correct matching.
Pyrometallurgy : Extraction of Fe
Electrometallurgy : Extraction of A1
Hydrometallurgy : Extraction of Au
All above are correct
46846.Which among the following statements are true for the complex $[Co(NH_3)_6][Cr(CN)_6]$?
(i) It is a non-electrolyte
(ii) The magnitude of the charge on each complex ion is three
(iii) The complex will not conduct current in aqueous solution
(iv) The complex will exhibit co-ordination isomerism
(v) The magnitude of the charge on each complex ion is one
(i) It is a non-electrolyte
(ii) The magnitude of the charge on each complex ion is three
(iii) The complex will not conduct current in aqueous solution
(iv) The complex will exhibit co-ordination isomerism
(v) The magnitude of the charge on each complex ion is one
1 and 4
1 and 3
3 and 5
2 and 4
46847.The pair of species with the same bond order is
$O^{-2}_2, B_2$
$O^{+}_2,NO^+$
NO, CO
$N_2,O_2$
