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Mdcat-past-papers - UHS Quiz

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1661. A chemical reaction has a theoretical yield of 25 g, but only 20 g of product was obtained. What is the percentage yield of the reaction?



1662. Which of the following situations most clearly demonstrates a key characteristic of a Redox reaction?



1663. If 100 KJ of heat is absorbed by the system and 40 KJ of water is done on the system what is the change of internal energy?



1664. Number of unpaired electrons present in the ground state of Fe3+ are (Atomic number of Fe=26).



1665. If % yield and actual yield is 80 and 20g respectively, what will be theoretical yield?



1666. Which of the following best identifies the redox reaction:



1667. Methanol is produced by reduction of :



1668. IUPAC name of (CH3)3CCH2Br is :



1669. Which one shows anisotropic behavior?



1670. In a unit cell of a crystal lattice the angle β is between faces:



1671. Pick the crystalline solid:



1672. Number of unpaired electrons in Boron in ground state is/are:



1673. Chlorination of benzene in the presence of iron (III) chloride involves mechanism of:



1674. The element with smallest value of ionization energy is:



1675. Carboxylic acid reacts with ammonia to form ammonium salts which on heating produces:



1676. If P is the momentum of an object and m is its mass, then its kinetic energy is:



1677. The electric field at a point due to two equal and opposite charges is 100 N/C. If the magnitude of each charge is doubled then the electric field at that point becomes:



1678. If a plastic sheet of relative permittivity 2.5 is inserted between two-point charges placed in vacuum then the electrostatic force between them



1679. After 3 half-lives, the remaining fraction of a radioactive sample is:



1680. If the horizontal range of a projectile becomes half of its maximum possible horizontal range, the probable angle of projection is:



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