I've been assisting my daughter in reaching her target assignment of 240,000 points on Freerice.com. One of my favorite categories is "World Capitals." I must admit it's a bit tough to remember all of the answers, and so, I came up with this list to assist and guide me. I also hope it helps out those who need it. The list is by far incomplete. They are based on the ones I have encountered most. I will work on adding new entries as I come upon them.
Items below are listed as Capital - Country:
Abu Dhabi = United Arab Emirates
Abuja = Nigeria
Accra = Ghana
Addis Ababa = Ethiopia
Ankara = Turkey
Antananarivo = Madagascar
Apia = Samoa
Ashgabat = Turkmenistan
Astana = Kazakhstan
Bamako = Mali
Bangkok = Thailand
Bangui = Central African Republic
Banjul = The Gambia
Basseterre = Saint Kitts and Nevis
Belgrade = Serbia
Belmopan = Belize
Bishkek = Kyrgyzstan
Bratislava = Slovakia
Brazzaville = Congo-Republic
Bridgetown = Barbados
Bucharest = Romania
Bujumbura = Burundi
Canberra = Australia
Caracas = Venezuela
Castries = Saint Lucia
Chisinau = Moldova
Colombo = Sri Lanka
Conakry = Guinea
Copenhagen = Denmark
Dhaka = Bangladesh
Dili = Timor-Leste
Dodoma = Tanzania
Doha = Qatar
Dublin = Ireland
Dushanbe = Tajikistan
Freetown = Sierra Leone
Funafuti = Tuvalu
Gaborone = Botswana
Georgetown = Guyana
Guatemala City = Guatemala
Harare = Zimbabwe
Honiara = Solomon Islands
Kampala = Uganda
Kiev = Ukraine
Kigali = Rwanda
Kingstown = Saint Vincent-Grenadines
Kinshasa = Congo-Democratic Republic
Kuala Lumpur = Malaysia
Libreville = Gabon
Lilongwe = Malawi
Lima = Peru
Ljubljana = Slovenia
Lome = Togo
London = United Kingdom
Luanda = Angola
Lusaka = Zambia
Majuro = Marshall Islands
Malabo = Equatorial Guinea
Managua = Nicaragua
Maputo = Mozambique
Maseru = Lesotho
Melekeok = Palau
Mexico City = Mexico
Minsk = Belarus
Monrovia = Liberia
Montevideo = Uruguay
Muscat = Oman
Nassau = The Bahamas
Niamey = Niger
Nouakchott = Mauritania
Nuku'alofa = Tonga
Oslo = Norway
Ottawa = Canada
Palikir = Micronesia
Panama City = Panama
Paramaribo = Suriname
Phnom Penh = Cambodia
Podgorica = Montenegro
Port Louis = Mauritius
Port Moresby = Papua New Guinea
Port-Vila = Vanuatu
Port-of-Spain = Trinidad and Tobago
Porto-Novo = Benin
Pretoria = South Africa
Rabat = Morocco
Roseau = Dominica
Saint John's = Antigua and Barbuda
Saint George's = Grenada
Sanaa = Yemen
San Salvador = El Salvador
Santiago = Chile
Sarajevo = Bosnia and Herzegovina
Skopje = Macedonia
Suva = Fiji
Tallinn = Estonia
Tarawa = Kiribati
Tashkent = Uzbekistan
Tegucigalpa = Honduras
Tirane = Albania
Tokyo = Japan
Tunis = Tunisia
Victoria = Seychelles
Vientiane = Laos
Vilnius = Lithuania
Wellington = New Zealand
Windhoek = Namibia
Yamoussoukro = Cote d'Ivoire
Yaounde = Cameroon
Yerevan = Armenia
Zagreb = Croatia