[{"_1":2,"_429":-5,"_430":-5},"loaderData",{"_3":4,"_61":62,"_64":65},"root",{"_5":6,"_7":8,"_59":60},"url","http://examplayground.com/questions/waec/chemistry/1990/20","clientEnv",{"_9":10,"_11":12,"_13":14,"_15":16,"_17":18,"_19":20,"_21":22,"_23":24,"_25":26,"_27":28,"_29":30,"_31":32,"_33":34,"_35":36,"_37":38,"_39":40,"_41":42,"_43":44,"_45":46,"_47":48,"_49":50,"_51":52,"_53":54,"_55":56,"_57":58},"E2E_Public_Key","vKcFStB+BIc9WqIBhJZkPOUl/WsExzaZgHjS3LW9QBo=","GOOGLE_AUTH_CLIENT_ID","554486308226-hci3bklk3fm8k84kbgqnbeblcun85ab5.apps.googleusercontent.com","WEB_BASE_URL","https://examplayground.com","API_BASE_URL","https://api.examplayground.com","COMPANY_LINK","https://brainbehindx.com","COMPANY_NAME","BrainBehindX Inc.","IS_DEV",false,"PROJECT_NAME","examplay","APP_NAME","ExamPlay","FLUTTERWAVE_PUBLIC_KEY","FLWPUBK_TEST-7f676bebac9bda941ec2ba2f1e48c8fb-X","LOCAL_STORAGE_ENCRYPTION_KEY","UUzw68gdJvBjNfJJwIXkEJAHpmxcOJ","RECAPTCHA_SITE_KEY","522ea064-7b68-4cec-8aa6-76ea42f2ef10","WEB_VERSION","1.0","FLUTTERWAVE_SCRIPT_SRC","https://api.examplayground.com/assets/scripts/flutterwave_v3.js","STRIPE_SCRIPT_SRC","https://js.stripe.com/v3/","STRIPE_PUBLISHER_KEY","pk_test_51MANw7Aa3WBkjmReICF2SVhGbnEW8lUW9Mj5FQl8s412LNwgCByNIzaYnSz7UC35edhjXBp5aWuSonjk4BOuVzxP00Lf2smRQN","MATH_JAX_SCRIPT_SRC","https://api.examplayground.com/assets/scripts/tex-chtml-full.js","MATH_SCRIPT_SRC","https://api.examplayground.com/assets/scripts/math.min.js","translationHash","b8f413fae36c34602dc6b88388dbcd89","ssoAuthHash","1562f77d2d5ce2f66441037dfc2892e9","SSO_AUTH_URL","https://cache.examplayground.com","AVATAR_BASE_URL","https://avatars.examplayground.com","EXAM_MEDIA_URL","https://media.examplayground.com","HTML_2_CANVAS","https://api.examplayground.com/assets/scripts/html2canvas.min.js","JS_PDF_SRC","https://api.examplayground.com/assets/scripts/jspdf.umd.min.js","serverTime",1759788598739,"routes/_nav",{"_63":-7},"pricing","routes/_nav.questions_.$key_.$course.$section_.$no",{"_66":67,"_68":69,"_70":-7,"_71":-7,"_72":-7,"_73":-7,"_74":-7,"_75":76,"_98":99,"_5":6,"_100":-7,"_101":102,"_103":104,"_362":-7,"_363":364},"isbot",true,"machineCode","GiQZcAySR2aJBtXytTXyQD3TLISPom","user","userData","userSettings","sessionTheme","authToken","geo",{"_77":78,"_81":82,"_83":84,"_85":86,"_87":88,"_89":84,"_90":91,"_94":95,"_96":97},"range",[79,80],3628718080,3628718335,"country","US","region","","eu","0","timezone","America/Chicago","city","ll",[92,93],37.751,-97.822,"metro",0,"area",1000,"host","examplayground.com","session_lang","server_lang","en","server_lang_store",{"_102":105},{"_106":107,"_352":353},"common",{"_108":109,"_110":111,"_112":113,"_114":115,"_116":117,"_118":118,"_119":120,"_121":122,"_123":124,"_125":126,"_127":128,"_129":130,"_131":132,"_133":134,"_135":136,"_137":138,"_139":140,"_141":142,"_143":144,"_145":146,"_147":148,"_149":149,"_150":150,"_151":151,"_152":152,"_153":153,"_154":154,"_155":155,"_156":156,"_157":157,"_158":158,"_159":159,"_160":160,"_161":162,"_163":164,"_165":166,"_167":168,"_169":169,"_170":170,"_171":172,"_173":174,"_175":176,"_177":178,"_179":180,"_181":182,"_183":184,"_185":186,"_187":188,"_189":190,"_191":191,"_192":192,"_193":194,"_195":196,"_197":198,"_199":200,"_201":202,"_203":204,"_205":206,"_207":208,"_209":210,"_211":212,"_213":214,"_215":216,"_217":218,"_219":220,"_221":222,"_223":224,"_225":226,"_227":228,"_229":230,"_231":232,"_233":234,"_235":236,"_237":238,"_239":240,"_241":242,"_243":244,"_245":246,"_247":248,"_249":250,"_251":252,"_253":254,"_255":256,"_257":258,"_259":260,"_261":262,"_263":264,"_265":266,"_267":268,"_269":270,"_271":272,"_273":274,"_275":275,"_276":277,"_278":278,"_279":280,"_281":282,"_283":283,"_284":285,"_286":287,"_288":289,"_290":291,"_292":293,"_294":295,"_296":297,"_298":168,"_299":300,"_301":302,"_303":304,"_305":306,"_307":307,"_308":308,"_309":309,"_310":310,"_311":311,"_312":312,"_313":313,"_314":314,"_315":315,"_316":316,"_317":318,"_319":320,"_321":322,"_323":323,"_324":324,"_325":320,"_326":322,"_327":327,"_328":329,"_330":331,"_332":333,"_334":335,"_336":337,"_338":339,"_340":341,"_342":343,"_344":345,"_346":347,"_348":349,"_350":351},"yes","Yes","no","No","retry","Retry","is","Is","contact_us","Contact Us","visit","dismiss","Dismiss","continue","Continue","cancel","Cancel","page_not_found","Page Not Found","page_not_found_des","This page has either been deleted or doesn't exists","feature","Feature","feature_under_dev","This feature is currently under development","ok_gotit","Ok, Got It","sun","Sun","mon","Mon","tue","Tue","wed","Wed","thur","Thur","fri","Fri","sat","Sat","JAN","FEB","MAR","APR","MAY","JUN","JUL","AUG","SEPT","OCT","NOV","DEC","users","Users","server","Server","no_comment_yet","No Comment Yet","show_more","Show More","reply","replies","show","Show","type_your_reply","Type your reply here","report_comment","Report Comment","comment_report","Comment Report","comment_report_des_prefix","I am reporting about comment at","delete_comment","Delete Comment","delete_comment_des","Are you sure you want to delete this comment","share_comment","Share Comment","edit_comment","Edit Comment","reply_comment","Reply Comment","edited","Reply","login_to_comment","Login To Comment","write_comment_here","Write comment here","comment_not_found","Comment Not Found","reply_not_found","Reply Not Found","comment_not_found_des","The comment you are looking for has either been deleted or doesn't exist","admin","Admin","joined_on","Joined On","block","Block","nothing_found","Nothing Found","cookies_des","We've baked some cookies that you have to accept. We use third-party cookies to personalize content and to analyze web traffic. By using our website, you automatically accept our cookies.","read_about_cookies","Read more about our cookies","i_love_cookies","I love cookies 😋","homepage","Homepage","practise","Practise","challenge","Challenge","questions","Questions","faqs","Faqs","contact","Contact","about_us","About Us","advertisement","Advertisement","privacy_policy","Privacy Policy","download_app_offline","Download the app to enjoy offline experience","legals","Legals","copyright","Copyright","search_users_exams_questions","Search Users, Exams, Questions","sign_in","Sign In","app_desc","Practice millions of MCQs across different subjects, courses and exams. Generate quizzes from your notes and PDFs instantly.","my_profile","My Profile","select_valid_image_error","An error occurred, please select a valid image","notification","Notification","make_all_as_read","Make All As Read","delete_all","Delete All","delete_all_des","Do you really want to delete all notifications? action is irreversible","no_notification","No Notification","you_have_new_notification","You have new notification","exam","Exam","result","Result","view","View","answer","Answer","or","Or","and","And","more","extracted_from","Extracted from","section","error","Error","enter_your_email","Enter your email","required","copy","Copy","search_users","Search users","selected_users","Selected Users","user_list","User List","no_users_found","No Users Found","select_users","Select Users","show_less","Show Less","show_More","powered_by","Powered By","unexpected_error","Unexpected Error","unexpected_error_des","An unexpected error has occurred, please try again","allow_javascript","Allow javascript to properly load this page","minutes","seconds","hours","days","months","years","mins","secs","hrs","year","right_now","right now","about_1_minute_ago","about 1 minute ago","1_minute_ago","1 minute ago","yesterday","week","about_1_min_ago","1_min_ago","loading","monthly","Monthly","annually","Annually","silver_plan_cavets","You need to be on the Gold plan to generate quizzes directly from your PDFs and Documents!","select_a_plan","Select A Plan","gold","Gold","silver","Silver","remove_ads","Remove Ads","unlock_all_exams","Unlock All Exams","ai_exams","AI Quiz","offline_practise","Offline Practise","initializing_payment","Initializing Payment","opps_des","Oops, something went wrong, please refresh the page and try again","question_no",{"_354":355,"_356":357,"_269":270,"_358":359,"_360":361},"question_not_found","Question Not Found","question_not_found_des","This question has either been deleted or doesn't exist","explanation","Explanation","comments","Comments","force_lang","pageData",{"_365":366,"_367":368,"_406":370,"_407":408,"_278":415,"_110":426,"_427":-5,"_428":-5},"courseName","Chemistry","examData",{"_369":370,"_371":372,"_375":376,"_378":379,"_380":381,"_382":383,"_384":385,"_386":34,"_387":67,"_388":389,"_81":396,"_397":398,"_399":400,"_401":400,"_402":403,"_404":405},"_id","waec","imgSize",[373,374],325,306,"cate",[377],"entrance_exam","name","WAEC","img","https://media.examplayground.com/storage/exams/waec/logo.png","des","Access a comprehensive collection of WAEC past questions and answers across all subjects, including Mathematics, English, Biology, Chemistry, Physics, and more. These resources are designed to help you familiarize yourself with the exam format, identify key topics, and practice effectively. Whether you're preparing for the May/June or GCE sessions, our curated materials provide both objective and theory questions to enhance your study sessions.","tags","waec nigeria west africa examination council","version","vip","location",{"_390":391,"_392":393},"type","Point","coordinates",[394,395],9.082,10.3671,"ng","priority",18,"createdOn",1755991949910,"updatedOn","questionsCount",27220,"courseCount",23,"examKey","questionData",{"_369":409,"_410":411,"_412":413,"_278":415,"_416":417,"_263":370,"_418":419,"_110":425},"SEZGS73uoeU56CeXmnWmRnTA7eGIQk","q","Which of the following equations represents the reaction leading to the removal of permanent hardness of water?","ans",[414],1,"1990","course","chemistry","opts",[420,421,422,423,424],"Ca(HCO ₃)₂ → CaCO₃ + H₂O + CO₂","MgSO₄ + Na ₂CO₃ + Na ₂SO","Ca(OH) ₂ + 2HCI → CaCI ₂ + 2H ₂O","Ca(HCO₃)₂ + Ca(OH)₃ → 2CaCO₃ + 2H₂O","MgSO₄ + BaCI₂ → MgCI₂ + BaSO₄",20,"20","initComment","initReply","actionData","errors"]

WAEC - Chemistry (1990 - No. 20)

Comments (0)