C oxides of group 2 elements produce bubbles when

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C Oxides of Group 2 elements produce bubbles when added to dilute hydrochloric acid. D The oxides of Group 2 elements are amphoteric.
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7 © UCLES 2019 9701/12/O/N/19 [Turn over 14 When equal volumes of saturated solutions of barium hydroxide and calcium hydroxide are mixed, a white precipitate, Y, forms. The mixture is filtered and carbon dioxide is bubbled through the filtrate, producing a second white precipitate, Z. What are Y and Z? Y Z A Ba(OH) 2 Ca(OH) 2 B Ba(OH) 2 CaCO 3 C Ca(OH) 2 BaCO 3 D Ca(OH) 2 Ba(OH) 2 15 Chlorate( V ) ions, C l O 3 , are produced in the redox reaction between chlorine and hot aqueous sodium hydroxide. Oxidation numbers can be used to help balance the equation for this reaction. vC l 2 (g) + wOH (aq) xC l (aq) + yC l O 3 (aq) + zH 2 O(l) What are the values of v, x and y in the balanced equation? v x y A 2 3 1 B 3 4 2 C 3 5 1 D 7 12 2 16 The properties of chlorine, bromine and their compounds are compared. Which property is smaller for chlorine than for bromine? A bond strength of the hydrogen-halide bond B first ionisation energy C solubility of the silver halide in NH 3 (aq) D strength of the van der Waals’ forces between molecules of the element 17 Solid sodium iodide reacts with concentrated sulfuric acid to form more than one product that contains sulfur. What is the lowest oxidation number of sulfur in these products? A –2 B 0 C +4 D +6
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8 © UCLES 2019 9701/12/O/N/19 18 Which emission from an internal combustion engine contributes to the erosion of marble statues? A carbon monoxide B nitrogen C nitrogen dioxide D unburnt hydrocarbons 19 Ammonia, carbon dioxide and water react together to form ammonium carbonate. Which statement about this reaction is correct? A It is a redox reaction. B It is an acid-base reaction. C The H–N–H bond angle decreases as a consequence of this reaction. D The three substances react in a 1 : 1 : 1 ratio in this reaction. 20 Structural isomerism and stereoisomerism should be considered when answering this question. How many isomers with the formula C 5 H 10 have structures that involve π bonding? A 3 B 4 C 5 D 6 21 The diagram shows the skeletal formula of phenazine. phenazine N N What is the empirical formula of phenazine? A C 6 H 4 N B C 6 H 6 N C C 12 H 8 N 2 D C 12 H 12 N 2 22 An organic compound X reacts with hot, concentrated acidified potassium manganate( VII ) solution to give a single carbon-containing product. What could be X? A CH 2 C(CH 3 ) 2 B CH 3 CHCHCH 3 C CH 2 CHCH 2 CH 3 D CH 3 CH 2 CH 2 CH 3
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9 © UCLES 2019 9701/12/O/N/19 [Turn over 23 1-chloro-2-methylbutane reacts with sodium cyanide in ethanol in a nucleophilic substitution reaction. What is the most likely intermediate or transition state in this reaction? H NC C l H CH(CH 3 )CH 2 CH 3 C A H H CH(CH 3 )CH 2 CH 3 +C CH 3 +C H 3 C NC C l CH 2 CH 3 H 3 C CH 2 CH 3 CH 3 C B C D 24 Propan-1-ol can be reacted with acidified potassium dichromate( VI ) to form propanoic acid, reaction 1, or propanal, reaction 2. CH 3 CH 2 COH CH 3 CH 2 CH 2 OH O CH 3 CH 2 CH O propan-1-ol reaction 1 reaction 2 How can the reaction be carried out to ensure that reaction 2 occurs rather than reaction 1?
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  • Sulfuric acid, UCLES

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