54) 6 54)The arrangement of oxygen atoms around a silicon atom in SiO44_ is A) s

Question

54) 6 54)The arrangement of oxygen atoms around a silicon atom in SiO44_ is A) square planar B) tetrahedral C) octahedral D) trigonal pyramidal E) linear 55) Hydrogen can form hydride ions. Elements in grouptypically form ions with the same 55) charge as the hydride ion. A) 6A B) 2A C)7A D) IA E) 3A so 56) has the lowest boiling point of any substance known. A) Rn B) Ar D) Ne E) He The Haber process is used to make from- ? A) HNO3. N2 B) NO2,02 C) NO, N2 D) 02, KC03 E) NH3. N2 58) An example of a form of pure carbon that contains only sp3 hybridized carbon atoms is A) graphite B) carborundum C) charcoal D) diamond E) carbon black 59) Glass is whereas quartz is_ A) pure SiO2, a mixture of Sio2 and carbonates B) crystalline, amorphous C) breakable, not breakable D) amorphous, crystalline E) hard, soft 60 61) D 60) Which group 3A element is a metalloid? A) Ga B) Al C TI D) B E) In 61) A mineral is A) a vitamin B) a transition metal ion C) a source of carbon D) a solid inorganic compound that contains one or more metals E) metal in its elemental form

Explanation / Answer

55. The elements in group1A are called alkali metals (except hydrogen).

The electronegativity of 1A-group elements (Li, Na, K, Rb, Cs) is lower than that of hydrogen.

Hence, they form ions with the same charge as the hydride ion.

For example: LiH, NaH, KH, RbH, CsH

Therefore, the correct answer is option D.

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