این سوال از سوال قبلی آسان تر است.

A careful reading is:

in so'âl az so'âl-e ghabli âsân-tar ast

A more natural everyday pronunciation in Tehran-style speech would often sound closer to:

in soâl az soâl-e ghabli âsun-tare

A few things change in casual speech:

• آسان often sounds like آسون
• است often becomes -e or -he
• the unwritten ezafe after سوال is pronounced as -e

That -e is called ezafe. In Persian, when a noun is followed by an adjective, you usually pronounce an -e between them.

So:

• سوال قبلی is pronounced so'âl-e ghabli
• it means the previous question or a previous question, depending on context

In normal Persian spelling, ezafe is often not written after a word ending in a consonant, but it is still pronounced.

Persian comparatives are usually made like this:

X از Y adjective + تر است

So literally, this sentence is structured like:

• این سوال = this question
• از سوال قبلی = than the previous question
• آسان‌تر است = is easier

So the pattern is:

this question + than the previous question + easier is

That is the normal Persian word order.

Here, از means than.

This is a very common use of از in comparisons:

• علی از رضا بلندتر است = Ali is taller than Reza
• این کتاب از آن کتاب بهتر است = This book is better than that book

In other contexts, از can also mean from, of, or out of, so learners often find it confusing at first. In this sentence, though, it is simply the comparison word than.

قبلی means previous, earlier, or the one before.

It comes from قبل, meaning before or earlier.

So:

• سوال قبلی = the previous question
• درس قبلی = the previous lesson
• صفحه قبلی = the previous page

In everyday Persian, قبلی is very common.

تر is the comparative ending, like -er in English.

So:

• آسان = easy
• آسان‌تر = easier

In careful modern spelling, it is usually written with a half-space:

• آسان‌تر

But many people type it with a normal space:

• آسان تر

So the sentence you saw is very common, even though آسان‌تر is usually considered the more standard written form.

Because Persian usually puts the verb at the end.

So while English says:

This question is easier than the previous question

Persian says:

This question than the previous question easier is

That final است means is.

In formal writing, است is common. In everyday speech, it is often shortened:

• است → ه or ـه
• آسان‌تر است → آسون‌تره

Persian does not have a definite article like English the.

So Persian often leaves definiteness to context.

For example:

• سوال قبلی can mean the previous question
• این سوال means this question, and این already makes it specific

So even without a separate word for the, the meaning is still clear.

Yes, you often can, if the context is clear.

So both of these can work:

• این سوال از سوال قبلی آسان‌تر است
• این سوال از قبلی آسان‌تر است

The second version is more concise and can sound very natural when everyone already knows you are comparing questions.

They are the same word: question.

• سؤال is the more traditional spelling
• سوال is a very common simplified spelling

Both are widely understood, and both are used in real life. Many learners will see both forms, so it is good to recognize them as the same word.

Yes. In everyday spoken Persian, many people would say:

این سوال از سوال قبلی آسون‌تره

Compared with the written version:

• آسان becomes آسون
• است becomes ـه

So:

• written/formal: این سوال از سوال قبلی آسان‌تر است
• spoken/colloquial: این سوال از سوال قبلی آسون‌تره

Both mean the same thing, but the second one sounds more conversational.