I think 'is' is right.
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"There is a pair of trousers" is correct because "pair" is a singular noun and takes a singular verb.
A pair of diamond-encrusted jeans by Secret Circus holds the record for the world's most expensive trousers, priced at $1.3 million. These jeans are adorned with over 15,000 diamonds, making them a unique luxury item.
CPO
CPO
CPO
lone pair has more electrons than bond pair