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8350 quizzes
Which element of group 13 is a non-metal? New
High School (11–12) · The p-Block Elements
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Easy
Which gas is given off when aluminium dissolves in dilute hydrochloric acid? New
High School (11–12) · The p-Block Elements
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Boric acid is best described as New
High School (11–12) · The p-Block Elements
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Why does boron not form the ion [BF₆]³⁻, although aluminium forms [AlF₆]³⁻? New
High School (11–12) · The p-Block Elements
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An aluminium rod of mass 2.16 g reacts completely with excess dilute hydrochloric acid and a gas bubbles off. What volume of that gas is collected at 273 K and 1 atm? Take M(Al) = 26.98 g/mol and a molar volume of 22.4 L/mol. New
High School (11–12) · The p-Block Elements
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A solution of borax in water turns red litmus blue. The reason is that New
High School (11–12) · The p-Block Elements
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Which statement about diborane, B₂H₆, is correct? New
High School (11–12) · The p-Block Elements
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Hard
A current of 50.0 A is passed through molten alumina until 13.5 g of aluminium forms. For how many hours does it flow? Take F = 96485 C/mol and M(Al) = 26.98 g/mol. New
High School (11–12) · The p-Block Elements
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Assertion (A): Boron trifluoride reacts with ammonia to form an adduct. Reason (R): The boron atom in boron trifluoride has an incomplete octet and an empty p orbital. New
High School (11–12) · The p-Block Elements
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An impure sample of boric acid of mass 0.640 g is dissolved in water, mannitol is added, and the mixture is titrated as a monobasic acid with sodium hydroxide. It needs 38.0 mL of solution of concentration 0.250 mol/L. What is the percentage of boric acid in the sample? Take M = 61.83 g/mol. New
High School (11–12) · The p-Block Elements
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Hard
Which of these materials carries an electric current when it is solid? New
High School (11–12) · The p-Block Elements
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Easy
Dry ice is New
High School (11–12) · The p-Block Elements
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Carbon dioxide is a gas, but silicon dioxide is a hard solid. The reason is that New
High School (11–12) · The p-Block Elements
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Medium
The carbon atoms in diamond, graphite and C60 are, in that order, hybridised as New
High School (11–12) · The p-Block Elements
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Sodium hydrogencarbonate of mass 29.4 g is heated strongly in an open dish, and gives sodium carbonate, carbon dioxide and steam. What volume of carbon dioxide forms at 273 K and 1 atm? Take M(NaHCO₃) = 84.0 g/mol and 22.4 L/mol. New
High School (11–12) · The p-Block Elements
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The picture shows a ring of three SiO4 tetrahedra seen from above, each sharing two corners with its neighbours. The anion has the formula New
High School (11–12) · The p-Block Elements
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Carbon tetrachloride does not react with water, but silicon tetrachloride does. The best reason is that New
High School (11–12) · The p-Block Elements
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Silicones are polymers that are used in sealants and for waterproofing. Which statement about them is correct? New
High School (11–12) · The p-Block Elements
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How many hexagons are on the surface of a fullerene that has 100 carbon atoms, each bonded to three others, with 12 pentagons? New
High School (11–12) · The p-Block Elements
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A closed vessel of volume 7.00 L at 310 K holds 22.0 g of carbon dioxide that came from evaporated dry ice. Take R = 0.08206 L atm/(K mol) and M = 44.01 g/mol. What is the pressure of the gas? New
High School (11–12) · The p-Block Elements
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Which element of group 13 is most stable in the +1 state? New
High School (11–12) · The p-Block Elements
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Among the hydrides of group 14, which one has the highest thermal stability? New
High School (11–12) · The p-Block Elements
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Which of these chlorides is hydrolysed by water? New
High School (11–12) · The p-Block Elements
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Boron tribromide and boron trifluoride are both Lewis acids. Which one accepts an electron pair more readily? New
High School (11–12) · The p-Block Elements
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Which of these oxides is amphoteric? New
High School (11–12) · The p-Block Elements
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