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Mdcat-past-papers Quiz

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421. When 2 ice cubes are pressed over each other they unit to form one cube due to:



422. Air is a mixture of gases. The molecules of air do not settle down due to:



423. Intermolecular forces between molecules of ideal gas are:



424. A well known physical change is the melting of ice. The melting of ice is favored by:



425. Carboxylic acids are water soluble because they:



426. When two ice cube are pressed over each other they unite to form one cube due to



427. DNA molecule is a double standard, in which two chains of DNA are twisted around each other by:



428. Ice is less dense than water at:



429. In crystal lattice of ice, each O-atom of water molecule is attached to:



430. The stability of the following structure is due to the:



431. According to James Watson Crick's model of DNA, the DNA molecule consists double helix. What type of forces are responsible to keep two strands of DNA together?



432. An intermolecular force of attraction X is relatively stronger than the other intermolecular forces, it stabilizes a-helix by:



433. Which of the following substances exhibits hydrogen bonding?



434. Which one of the following DO NOT have tendency to form hydrogen bonding?



435. Water rises in capillary tube because of:



436. The strongest hydrogen bond is present in:



437. Ice floats on the surface of water due to:



438. Exceptionally low acidic strength of HF is due to:



439. How many H-bonds a water molecule can form with other water molecule?



440. Water shows maximum density at:



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