16. Choose the statement that best describes the SiCls molecule in the gas phase

Question

16. Choose the statement that best describes the SiCls molecule in the gas phase. A) The bond angle are all about 109.5 B) The molecule is polar. C) The molecule has a dipole moment. D) The bonds are nonpolar. E) A, B, and C 17. How many atoms of oxygen are in 12.99 g of nickei(l) nitrate? A) 2.569 x 1023 B) 1.944 x 1023 C) 1.308 x 1023 D) 1.284 x 1023 E) 2.141 x 1023 18. The hybridization of the central atom in XeFs*1 is A) Sp B) spa C) sp3 D) dsp3 E) d2sp3 19. Which list of compounds has them listed from highest to lowest mp A) CaS > NaCl> H2O> CH3CI> Br2> He B) NaCI> Cas> CH3CI> H2O >Br2> He C) CaS>NaCI >CHaCI> H2O > Br2> He D) He > Br2 >H2O> CH3CI>NaCI> Cas E) Cas > NaCI> CH3CI>H2O> He > Br2

Explanation / Answer

16)

Number of valence electrons in Si is 4

these 4 electrons are used in forming 4 bonds and there will not be any lone pairs on Si

So, Si is sp3 hybridised

The shape is tetrahedral

Si-Cl bond is polar but overall molecule is non polar duw to symmetry

So, it will not have any overall dipole moment

Bond angle in tetrahedral is 109.5 degree

Answer: A

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