Maîtrisez le pH et les solutions acides-basiques en 7ème année !

Question 1 sur 10 10:00

[{"id":14348,"question":"Quel est le pH d'une solution neutre ?","option_a":"0","option_b":"7","option_c":"14","option_d":"10","option_e":"","option_f":"","bonne_reponse":"B","explication":"Une solution neutre a un pH de 7, ce qui signifie qu'elle n'est ni acide ni basique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":14349,"question":"Le jus de citron est une solution acide.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Le jus de citron a un pH inférieur à 7, donc il est acide. La réponse correcte est 'Vrai'.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":14350,"question":"Quel indicateur coloré devient bleu en présence d'une base ?","option_a":"Phénolphtaléine","option_b":"BBT","option_c":"Papier pH","option_d":"Eau de chaux","option_e":"","option_f":"","bonne_reponse":"A","explication":"La phénolphtaléine devient rose\/violette en présence d'une base, tandis que le BBT devient bleu.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":14351,"question":"Une solution avec un pH de 3 est :","option_a":"Très basique","option_b":"Faiblement acide","option_c":"Fortement acide","option_d":"Neutre","option_e":"","option_f":"","bonne_reponse":"C","explication":"Un pH de 3 est fortement acide, car il est bien inférieur à 7.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":14352,"question":"Le papier pH permet de mesurer le pH avec précision.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"Le papier pH donne une estimation du pH, mais un pH-mètre est plus précis. La réponse correcte est 'Faux'.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":14353,"question":"Quel est le pH d'une solution de soude (NaOH) ?","option_a":"2","option_b":"7","option_c":"12","option_d":"14","option_e":"","option_f":"","bonne_reponse":"D","explication":"La soude est une base forte, donc son pH est proche de 14.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":14354,"question":"Le BBT (Bleu de Bromothymol) est jaune en milieu acide.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Le BBT est jaune en milieu acide et bleu en milieu basique. La réponse correcte est 'Vrai'.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":14355,"question":"Quelle est la valeur du pH d'une solution de vinaigre ?","option_a":"1","option_b":"3","option_c":"7","option_d":"10","option_e":"","option_f":"","bonne_reponse":"B","explication":"Le vinaigre est une solution acide, avec un pH généralement autour de 3.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":14356,"question":"Une solution avec un pH de 8 est :","option_a":"Acide","option_b":"Basique","option_c":"Neutre","option_d":"Impossible à déterminer","option_e":"","option_f":"","bonne_reponse":"B","explication":"Un pH de 8 est supérieur à 7, donc la solution est basique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":14357,"question":"Le pH d'une solution peut-il être négatif ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"Le pH varie généralement entre 0 et 14. Un pH négatif est extrêmement rare et non standard.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]