A tenth of the members of one Chamber can ask for a referendum on a constitutional reform. Within how many days after its approval?
Sources: 1 link, read on 21 October 2026.
Spanish Constitution, article 167 (BOE, consolidated text), read on 21 October 2026.
Answer: Fifteen days. Article 167.3 says the reform goes to a referendum if a tenth of the members of either Chamber ask for it within fifteen days.
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Constitution · article 167.3
The question in Spanish
Una décima parte de los miembros de una de las Cámaras puede pedir un referéndum sobre una reforma constitucional. ¿En qué plazo después de su aprobación?
The options
- ATen daysDiez días
- BThirty daysTreinta días
- CFifteen daysQuince díasCorrect
What the Constitution says
«3. Aprobada la reforma por las Cortes Generales, será sometida a referéndum para su ratificación cuando así lo soliciten, dentro de los quince días siguientes a su aprobación, una décima parte de los miembros de cualquiera de las Cámaras.»
Spanish Constitution of 1978, article 167 (paragraph 3, consolidated text at the BOE), read on 21 October 2026. The quotation is in Spanish, as the BOE prints it; the English wording of the answer is ours. Laws carry no copyright (Ley de Propiedad Intelectual, art. 13), so we quote the text as it stands.
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