Quiz — 71.._pH-5-.pdf

Question 1 sur 10 20:00

[{"id":5586,"question":"Quel est le pH d'une solution neutre ?","option_a":"3","option_b":"7","option_c":"10","option_d":"14","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le pH d'une solution neutre est égal à 7, car elle ne contient ni excès d'ions H+ ni d'ions OH-.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"3\", \"b\": \"7\", \"c\": \"10\", \"d\": \"14\"}}","_debug_options_count":4},{"id":5587,"question":"Un indicateur coloré change de couleur en fonction du pH.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Un indicateur coloré change de couleur en fonction du pH de la solution, ce qui permet de l'identifier.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":5588,"question":"Quel ion est responsable du caractère acide d'une solution ?","option_a":"H+","option_b":"OH-","option_c":"Na+","option_d":"Cl-","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le caractère acide d'une solution est dû à la présence d'ions H+ (ions hydrogène).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"H+\", \"b\": \"OH-\", \"c\": \"Na+\", \"d\": \"Cl-\"}}","_debug_options_count":4},{"id":5589,"question":"Le jus de citron a un pH d'environ 2. Quel est son caractère ?","option_a":"Neutre","option_b":"Basique","option_c":"Acide","option_d":"Amphotère","option_e":"","option_f":"","bonne_reponse":"c","explication":"Un pH inférieur à 7 indique une solution acide. Le jus de citron a donc un caractère acide.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"Neutre\", \"b\": \"Basique\", \"c\": \"Acide\", \"d\": \"Amphotère\"}}","_debug_options_count":4},{"id":5590,"question":"La neutralisation d'un acide par une base produit toujours de l'eau.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La réaction de neutralisation entre un acide et une base produit de l'eau et un sel.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":5591,"question":"Quel est le pH d'une solution basique ?","option_a":"1","option_b":"5","option_c":"8","option_d":"12","option_e":"","option_f":"","bonne_reponse":"d","explication":"Une solution basique a un pH supérieur à 7. Plus le pH est élevé, plus la solution est basique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"d\", \"options\": {\"a\": \"1\", \"b\": \"5\", \"c\": \"8\", \"d\": \"12\"}}","_debug_options_count":4},{"id":5592,"question":"La phénolphtaléine est incolore en milieu acide et rose en milieu basique.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La phénolphtaléine est un indicateur coloré qui devient rose en milieu basique et reste incolore en milieu acide.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":5593,"question":"Quel est le pH d'une solution de soude (NaOH) concentrée ?","option_a":"2","option_b":"5","option_c":"9","option_d":"14","option_e":"","option_f":"","bonne_reponse":"d","explication":"La soude (NaOH) est une base forte, donc son pH est très élevé, proche de 14.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"d\", \"options\": {\"a\": \"2\", \"b\": \"5\", \"c\": \"9\", \"d\": \"14\"}}","_debug_options_count":4},{"id":5594,"question":"Un indicateur coloré peut être utilisé pour déterminer la valeur exacte du pH.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Un indicateur coloré permet d'estimer le pH mais ne donne pas une valeur exacte. Un pH-mètre est nécessaire pour une mesure précise.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":5595,"question":"Quel est le pH d'une solution de vinaigre (acide acétique) ?","option_a":"1","option_b":"4","option_c":"7","option_d":"10","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le vinaigre est une solution acide, son pH est généralement compris entre 2 et 4.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"1\", \"b\": \"4\", \"c\": \"7\", \"d\": \"10\"}}","_debug_options_count":4}]