81 Regular coiling or zigzagging of polypeptide through hydrogen bonding is its___________________? Chemistry Medium Full question → A Quantum structure B Secondary structure C Tertiary structure D Primary structure
82 Which of the following is the formula of chrome red ? Chemistry Medium Full question → A Pb3 O4 B 2Pb CO3 – Pb (OH)2 C Pb Cr O4 – Pb (OH)2 D Pb2O
83 Across short period the melting and boiling point increase upto __________________? Chemistry Medium Full question → A IIIA group B IVA group C VA group D VIA group
84 Which of the elements do not fall in stair case of the modern periodic table__________________? Chemistry Medium Full question → A Si B As C Te D None of the above
85 Which of following metals can be displaced by all other metals from its solution ? Chemistry Medium Full question → A Ag B A C Au D Cu
86 In which of the following type of reactions energy of reactant is greater than energy of product________________? Chemistry Medium Full question → A endothermic B exothermic C unpredictable D same
87 At which electrode the reduction of the solution is occurring in Al-Ag cell_____________? Chemistry Medium Full question → A A B Ag C Both D Neither
88 The use of antifreeze in the automobile radiator is an important application of__________________? Chemistry Medium Full question → A constitutive property B additive property C colligative property D intrinsic property
89 1 mole of electron has mass in microgram_________________? Chemistry Medium Full question → A 1.008 x 10-3 B 5.5 x 10-4 C 1.84 x 10-4 D 1.673 x 10-3
90 A solution has pH = 0 its H+ ion concentration is__________________? Chemistry Medium Full question → A 1 x 10-1 B 1 x 10-14 C 1 x 10-7 D 1
91 Which of the following is not characteristics of reversible reaction__________________? Chemistry Medium Full question → A whole amount of reactant does not change into product B chemical equilibrium is established C a catalyst changes the direction of reaction D rate of forward reaction decreases as reaction proceeds
92 Which of the following theories is superior to others__________________? Chemistry Medium Full question → A VSEPR B VBT C MOT D none of the above
93 The balanced chemical equation for the reaction which occurs when Be is added to water is____________? Chemistry Medium Full question → A Be+2H2O?Be (OH)2+H2 B Be+H2O?Be (OH)2+H2 C Be+H2O?[Be (OH)4]+2+H2 D no reaction
94 Which of the solid does not contain covalent bond__________________? Chemistry Medium Full question → A copper B ice C diamond D graphite
95 The hardest of the following solids is__________________? Chemistry Medium Full question → A sodium B diamond C graphite D magnesium
96 Which of the following is mineral fiber ? Chemistry Medium Full question → A Teflon B asbestos C saran D acrylic
97 Which statement is consistent with Hunds rule ? Chemistry Medium Full question → A Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) spin. B The electrons in the same atom cannot have the same four quantum numbers C There is maximum of two electrons is an orbital. D None
98 When methl iodide and ethyl iodide are treated with sodium metal possible major products are obtained ? Chemistry Medium Full question → A 1 B 2 C 3 D 4
99 When an electron is moving with velocity of 2.188 x 106 ms-1 in the first orbit of Bohrs model of hydrogen. The de Broglie wavelength of electron is______________? Chemistry Medium Full question → A 0.33 nm B 0.34 nm C 0.35 nm D 0.36 nm
100 Which of the following properties prove that cathode rays are material in nature_________________? Chemistry Medium Full question → A they cast shadow B they possess momentum C they are negatively charged D all of the above