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A molecule of hydrogen cyanide, HCN, and a molecule of hydrazine, N2H4, are both drawn obeying the octet rule. What is the total number of... [1]
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014.2: Covalent bonding
4 questionsPractice
022.1: The atom
3 questionsPractice
031.2: The mole concept
2 questionsPractice
0411.2: Graphical techniques
2 questionsPractice
054.3: Covalent structures
2 questionsPractice
061.1: Introduction to the particulate nature of matter and chemical change
1 questionsPractice
0710.2: Functional group chemistry
1 questionsPractice
0811.1: Uncertainties and errors in measurement and results
1 questionsPractice
0911.3: Spectroscopic techniques
1 questionsPractice
102.2: Electrons in atoms
1 questionsPractice
114.4: Intermolecular forces
1 questionsPractice
125.2: Hesss law
1 questionsPractice
136.1: Collision theory and rates of reaction
1 questionsPractice
146.2: Rate expression and reaction mechanism
1 questionsPractice
157.2: The equilibrium law
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168.1: Theories of acids and bases
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178.3: The pH scale
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189.2: Electrochemical cells
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02 Questions

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A pure solid is heated at a constant rate from below its melting point until it is fully liquid. During the plateau of the heating curve, the energy suppliedMCQPropane undergoes complete combustion in excess oxygen. A sample of 0.50 mol of propane is burned completely. What amount of oxygen reacts?MCQVolume of gas collected is plotted against time for a reaction. A tangent drawn to the curve at t = 40 s passes through the points (10 s, 12 cm^3) and (60 s, 42 cm^3) . What is...MCQVolume of gas collected is plotted against time and a best-fit straight line is drawn through the scattered points. The line passes through (10, 6.0) and (50, 34.0) , while plot...MCQAn ion has the nuclear symbol 5626Fe3+. How many neutrons are in its nucleus?MCQFour regions of the electromagnetic spectrum are ultraviolet, visible, infrared and microwave. Which region contains photons of the highest energy?MCQCopper consists of two isotopes, 63Cu and 65Cu. The relative atomic mass of copper is 63.55. The abundance of 63Cu is x %. Which expression gives x ?MCQA molecule of hydroxylamine, NH2OH, obeys the octet rule for nitrogen and oxygen. How many non-bonding electrons are present in one molecule?MCQA molecule of hydrogen cyanide, HCN, has all atoms obeying the octet rule, except hydrogen which attains a duet. How many bonding pairs and lone pairs are present in the molecule?MCQA molecule of hydrogen cyanide, HCN, and a molecule of hydrazine, N2H4, are both drawn obeying the octet rule. What is the total number of non-bonding electron pairs in one HCN...MCQCarbon–carbon bond lengths in three hydrocarbons are 120 pm, 134 pm and 154 pm. Which molecule has the strongest carbon–carbon bond?MCQPropan-1-ol, butane and propanone all have similar molar masses. Their boiling points, in order from lowest to highest, are those ofMCQMagnesium reacts with excess hydrochloric acid. 48.0 cm^3 of hydrogen gas is collected in 30.0 s . What is the average rate of gas production?MCQ1.0 mol of H2 and 1.0 mol of I2 are placed in a 1.0 dm^3 vessel and reach equilibrium according to H2(g) + I2(g) ⇌ 2HI(g). At equilibrium [HI] = 1.6 mol dm^-3 . What is the equi...MCQAt 373 K the ionic product of water is K_w = 5.1 × 10^-13 . A solution at 373 K has [H^+] = 1.0 × 10^-7 mol dm^-3 . This solution isMCQMolten zinc chloride is electrolysed using graphite electrodes. Which property of graphite makes it suitable as an electrode in this cell?MCQDefineDefine relative atomic mass. [2]WRITTEN[2]ListList two destructive analytical techniques. [2]WRITTEN[2]StateState the standard enthalpy of formation definition. [2]WRITTEN[2]StateState two ways of reducing random error. [2]WRITTEN[2]DefineDefine isotopes. [2]WRITTEN[2]StateState the shape and bond angle of BF3. [2]WRITTEN[2]StateState the formula of iron(III) sulfate. [2]WRITTEN[2]DefineDefine rate-determining step and molecularity. [2]WRITTEN[2]IdentifyIdentify two amphiprotic anions. [2]WRITTEN[2]IdentifyIdentify the shape and bond angle of PH3. [2]WRITTEN[2]
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