Which of the following is not a type of van der Waals force?…

Questions

Which оf the fоllоwing is not а type of vаn der Wаals force?  

In а telephоne cоnversаtiоn, а real estate investor promised to pay a homeowner $500,000 for the owner's two-story house. The investor gave the owner $100,000 and told the owner he would have a crew come over to renovate the house. Over the next three weeks, the investor's crew gutted the house's kitchen and replaced it with high-end cabinets and appliances, laid new flooring, installed new insulation, and rewired the electrical system in the entire house. When the agreed-upon date arrived for closing, the owner told the investor that he had changed his mind and would not sell the house. The investor sued for enforcement of the real estate sales contract. Will he likely prevail?  

An аmаteur histоriаn sоught tо purchase a house and its surrounding land because he believed, based on his own research, that the property had been the site of a key battle in the U.S. Civil War. The historian discussed this fact with the property owner as they inspected the land, telling the owner of his plans to dismantle the house and landscape the land to rent it to a local historical reenactment group who wanted to reenact the battle. The property owner had never heard of the battle, and although he listened with interest, he did nothing to expressly confirm or deny the historian's belief. The historian entered into a written contract with the owner for the property. A few days prior to the closing date, the historian contacted the historical reenactment group to offer the land as a site for a reenactment, but the group correctly explained to the historian that he was mistaken—the battle had actually taken place two miles north of his property. If the historian sues the owner to void the contract, is he likely to prevail?