मेरी पलक लाल है।

Because पलक is a feminine singular noun.

In Hindi, possessive words like मेरा / मेरी / मेरे change to match the noun they describe:

• मेरा = masculine singular
• मेरी = feminine singular
• मेरे = masculine plural, or sometimes masculine singular in oblique contexts

Since पलक is feminine, you say मेरी पलक.

For comparison:

• मेरा हाथ = my hand
• मेरी आँख = my eye
• मेरी पलक = my eyelid

पलक usually means eyelid. In some contexts, it can also be associated with eyelashes, but the most straightforward meaning here is eyelid.

So मेरी पलक लाल है। is most naturally understood as My eyelid is red.

If you want to avoid ambiguity as a learner, it is safest to remember:

• पलक = eyelid

Because लाल is one of many Hindi adjectives that are invariable in common usage. That means it often stays the same regardless of gender or number.

So you get:

• लाल हाथ = red hand
• लाल आँख = red eye
• लाल पलक = red eyelid
• लाल होंठ = red lips

Compare this with adjectives that do change, such as अच्छा / अच्छी / अच्छे.

Examples:

• अच्छा लड़का
• अच्छी लड़की

But with लाल, the form usually remains लाल.

Because the subject being described is singular: पलक.

In simple descriptive sentences like this, है is used for singular and हैं for plural.

• मेरी pलक लाल है। = My eyelid is red.
• मेरी पलकें लाल हैं। = My eyelids are red.

So है matches the singular noun पलक.

The structure is:

[possessive] + [noun] + [adjective] + [is]

So:

• मेरी = my
• पलक = eyelid
• लाल = red
• है = is

Hindi often places the adjective before the verb, and the verb comes at the end:

मेरी पलक लाल है।

This is very normal Hindi word order.

No, not if you mean one eyelid.

Since पलक is singular, the correct verb is है:

• मेरी पलक लाल है।

If you mean eyelids in the plural, then both the noun and verb should change:

• मेरी पलकें लाल हैं।

So:

• singular: पलक ... है
• plural: पलकें ... हैं

You would say:

मेरी पलकें लाल हैं।

Here is what changed:

• पलक → पलकें for the plural
• है → हैं for the plural verb

So:

• मेरी पलक लाल है। = My eyelid is red.
• मेरी पलकें लाल हैं। = My eyelids are red.

Yes, it is grammatically correct and understandable.

That said, in everyday speech, people might sometimes use a slightly different body-part noun depending on exactly what they mean. For example, if the whole eye looks red, someone may say:

• मेरी आँख लाल है। = My eye is red.

If they specifically mean the eyelid, then मेरी पलक लाल है। is fine.

So the sentence is natural, but the exact noun depends on what part of the eye area you mean.

Often yes, especially when you want to be clear:

• मेरा हाथ दर्द कर रहा है। = My hand is hurting.
• मेरी आँख लाल है। = My eye is red.
• मेरी पलक लाल है। = My eyelid is red.

However, in context, Hindi can sometimes omit the possessive if it is obvious whose body part is being discussed. But for learners, including मेरा / मेरी / मेरे is a good, clear habit.

It is pronounced roughly like palak:

• प = p
• ल = l
• क = k

A simple English-friendly approximation is puh-luk or puh-luck, though the Hindi vowels are cleaner and shorter than in English.

Also note that Hindi spelling is phonetic, so once you know the script, the pronunciation is quite regular.

In neutral Hindi, मेरी पलक लाल है। is the most standard order.

Hindi does allow some flexibility for emphasis, but learners should usually stick with:

possessive + noun + adjective + है/हैं

So this is the safest pattern:

• मेरा हाथ ठंडा है।
• मेरी आँख लाल है।
• मेरी पलक लाल है।

That pattern will sound natural in most situations.