Two elements X and Y with electronic configurations 2,8,2 and 2,8,7 respectively, are likely to combine by _________bonding
A. covalent B. dative C. electrovalent D. hydrogen E. metallic Correct Answer: Option C – electrovalent
The furring of kettles and boilers are caused by?
A. calcium hydroxide B. calcium hydrogen trioxocarbonate (IV) C. calcium trioxocarbonate (IV) D. calcium tetraoxocarbonate E. magnesium tetraoxocarbonate (VI) Correct Answer: Option C – calcium hydrogen trioxocarbonate (IV) Explanation The furring of kettles or...
How many zones are present in a luminous Bunsen burner flame?
A. 2 B. 3 C. 4 D. 5 E. 6 Correct Answer: Option C – 4
When air is passed through alkaline pyrogallol and then lime water, the gases left are?
A. nitrogen and carbon (IV) oxide B. nitrogen and noble gases C. nitrogen and oxygen D. nitrogen, carbon (VI) oxide and noble gases E. the noble gases Correct Answer: Option B – nitrogen and noble gasesProducts
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