4. 5. Which among the following is a false statement ? (a) SiO2 has a structure similar to that of CO2 (b) Natural Si exists only in the combined state (c) Si can be prepared by reducing SiO2 with Mg (d) Si does not exist in graphite-like structure, but exists only in diamond like structure Which of the following graphs correctly represents the variation of particle momentum with associated de-Broglie wavelength? 6. P P (a) (b) P P (c) Ashiksha To stop bleeding, FeC13 is applied locally because : (a) FeCl3 seals the blood vessels (B) FeCl3 changes the direction of blood flow (C) FeCl3 reacts with blood to form a solid substance which seals the blood vessel (D) FeCl3 causes denaturation of proteins present in blood