Learn Hardcore Icelandic: Svarið er rangt, ekki satt?

Svar means answer and it’s a neuter noun. -ið is the definite article suffix for neuter singular nouns in the nominative/accusative, so svarið means the answer.

svar = an answer
svarið = the answer

What role does er play here?

Er is the present tense of að vera (to be) for third person singular: (he/she/it) is.
So Svarið er rangt literally corresponds to The answer is wrong.

Why is the adjective rangt ending in -t?

Because it agrees with svarið, which is neuter singular. Icelandic adjectives usually agree in gender, number, and case with the noun they describe (or the subject after að vera).

masculine sg: rangur
feminine sg: röng
neuter sg: rangt (used here)

Is rangt an adverb here, like English wrongly?

No—rangt is still an adjective. In Icelandic, after að vera (to be), you typically use an adjective describing the subject: The answer is wrong → Svarið er rangt. It’s not describing how something is done; it’s describing what the answer is like.

What does ekki satt? mean literally, and why is satt also neuter?

Literally, ekki satt? is like not true? / isn’t it true? It functions as a tag question (“…, isn’t it?”).
Satt is the neuter form of the adjective sannur (true) because it’s referring to an implied neuter idea like það (it/that): “Isn’t it true (that…)?”

Is ekki satt? the standard Icelandic equivalent of English ..., isn’t it?

It’s one very common equivalent, especially in neutral, everyday speech:

Svarið er rangt, ekki satt? = The answer is wrong, isn’t it?
You may also see or hear other tag-like endings depending on context and dialect, but ekki satt? is widely understood and safe to use.

Why is there a comma before ekki satt?

Because ekki satt? is a tag question added onto the end of the main clause. Icelandic normally separates that tag from the statement with a comma, much like English often does.

Could I also say Er svarið rangt? How is that different?

Yes. Er svarið rangt? is a straightforward yes/no question: Is the answer wrong?
Svarið er rangt, ekki satt? is a statement + confirmation, closer to: The answer is wrong, right? You’re expecting agreement.

Does the word order ever change in the first part (Svarið er rangt)?

In a normal declarative sentence, Subject – Verb – Complement is standard: Svarið – er – rangt.
If you turn it into a question, Icelandic typically uses verb-first order: Er svarið rangt? (Verb – Subject – Complement).

How is Svarið er rangt, ekki satt? pronounced?

A practical approximation (not perfect IPA):

Svarið ≈ SVAH-rith (with a voiceless th like in thing at the end)
er ≈ ehr
rangt ≈ rahngt (with a clear t sound; the ng is like in song)
ekki ≈ EH-kih
satt ≈ saht (short a, and a strong tt)

Also, Icelandic stress is usually on the first syllable: SVA-rið, RANGT, E-kki, SATT.

Is Svarið always the nominative here? Do I need to worry about cases in this sentence?

Here, svarið is the subject, so it’s in the nominative. In this particular sentence, you don’t see case changes because að vera doesn’t take an object, and the adjective rangt agrees with the nominative subject.
In other sentences, svar can appear in other cases, but this structure keeps it simple: [Subject] er [adjective].