Maîtrisez le pH et les solutions aqueuses — Quiz interactif

Question 1 sur 10 10:00

[{"id":16918,"question":"Quel est le pH d'une solution neutre ?","option_a":"pH = 0","option_b":"pH = 7","option_c":"pH = 14","option_d":"pH n'existe pas","option_e":"","option_f":"","bonne_reponse":"B","explication":"Une solution neutre a un pH égal à 7, ni acide ni basique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":16919,"question":"Le BBT (bleu de bromothymol) est un indicateur coloré qui vire au jaune en milieu acide.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Le BBT vire au jaune en milieu acide, au bleu en milieu basique et reste vert en milieu neutre.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":16920,"question":"Quelle est la formule permettant de calculer le pH d'une solution d'acide fort de concentration C ?","option_a":"pH = -log(C)","option_b":"pH = log(C)","option_c":"pH = 14 - log(C)","option_d":"pH = C","option_e":"","option_f":"","bonne_reponse":"A","explication":"Pour un acide fort, le pH se calcule par pH = -log(C), où C est la concentration en ions H⁺.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":16921,"question":"Une solution a un pH de 12. Comment la qualifier ?","option_a":"Acide","option_b":"Neutre","option_c":"Basique","option_d":"Ionique","option_e":"","option_f":"","bonne_reponse":"C","explication":"Un pH de 12 indique une solution basique, car supérieur à 7.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":16922,"question":"La phénolphtaléine est incolore en milieu basique.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"La phénolphtaléine est rose en milieu basique et incolore en milieu acide ou neutre.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":16923,"question":"Quel indicateur coloré utilise-t-on pour distinguer une solution de pH 5 d'une solution de pH 9 ?","option_a":"BBT","option_b":"Phénolphtaléine","option_c":"Hélianthine","option_d":"Papier pH","option_e":"","option_f":"","bonne_reponse":"A","explication":"Le BBT change de couleur entre pH 6 et pH 7,8, ce qui permet de distinguer ces deux solutions.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":16924,"question":"Calculez le pH d'une solution d'acide chlorhydrique de concentration 10⁻³ mol\/L.","option_a":"pH = 2","option_b":"pH = 3","option_c":"pH = 1","option_d":"pH = 4","option_e":"","option_f":"","bonne_reponse":"B","explication":"pH = -log(10⁻³) = 3.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":16925,"question":"Le pH d'une solution augmente lorsque l'on ajoute de l'eau distillée.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"L'ajout d'eau distillée dilue la solution, ce qui peut augmenter le pH si la solution initiale est acide.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":16926,"question":"Quelle est la couleur du BBT dans une solution de soude (NaOH) ?","option_a":"Jaune","option_b":"Vert","option_c":"Bleu","option_d":"Incolore","option_e":"","option_f":"","bonne_reponse":"C","explication":"Le BBT est bleu en milieu basique, comme dans une solution de soude.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":16927,"question":"Une solution a un pH de 4. Si on la dilue 10 fois, quel sera son nouveau pH ?","option_a":"pH = 3","option_b":"pH = 5","option_c":"pH = 4,5","option_d":"pH = 4","option_e":"","option_f":"","bonne_reponse":"C","explication":"La dilution d'une solution acide diminue sa concentration en ions H⁺, donc le pH augmente légèrement (ici, pH = 4,5).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]