want to buy 1 gram gold etf?

I want to buy gold etf from my icici demat account. I want to know about which gold etf is best to invest and also is that possible to buy 1 gram as most of the gold etf has given restriction to buy minimum amount to invest.

I just want to buy 1 gram when the price goes down.

What is the extra changes they take apart from devlivery.

LIC’s Annuity payable for remainder of life option has 50% spouse benefit?

For New Jeevan Suraksha-I pension plan, there are 5 options for Maturity Benefit from this page,

(i) annuity payable for remainder of life.
(ii) annuity payable for life with guarenteed period of 5,10,15 or 20 yrs.
(iii) Joint life and last survivor annuity to the annuitant and his/her spouse….

If I choose first option (annuity payable for remainder of life), will my spouse get 50% of pension on my death?
And choosing any of the 5 options returns same amount of pension?