A compound formed between an alkaline earth element, M and a halogen, X, will mo

Question

A compound formed between an alkaline earth element, M and a halogen, X, will most likely be (A) ionic with empirical formula M_2X. (B) covalent with molecular formula M_2X. (C) covalent with molecular formula MX_2 (D) ionic with empirical formula MX_2. The absorption spectrum of a solution of a ruthenium compound is shown. In which wavelength range is the transmission of light the greatest? (A) 540 to 560 nm (B) 450 to 470 nm (C) 420 to 440 nm (D) 350 to 370 nm Which indicator the most appropriate for equivalence point detection in the titration of a weak base by a strong acid? (A) alizarin yellow R (B) thymol blue (C) phenolphthalein (D) methyl red

Explanation / Answer

64)

alkaline earth metal has valency of +2

So, Alkaline earth metal will form M+2

halogen have valency of -1

so, halogen will form X-1

The compound is MX2

the compound will be ionic since cation and anion are formed

Answer: D

65)

absorbance has minima between 350 and 370 nm

Here, transmittance will be maximum

Answer: D) 350 to 370 nm

66)

since it is reaction between weak base and strong acid, pH will be less than 7 at equivalence point

So, we need the indicator whose color change occur at less than 7

Methyl red is one such indicator

Answer: D) methyl red

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