Which of the following is/are correct regarding the reaction

Which of the following is correct regarding BeO?

Which of the following is correct regarding the reaction of alkali metals with halogens ?

Which of the following is correct regarding the reaction of ketones with ethylene glycol in the presence of dry HCl? The product obtained is ethylene glycol hemi-ketal, In this reaction, electrophilicity of carbonyl carbon decreases, HCl protonates the oxygen of the carbonyl group, The product thus obtained is cyanohydrin

Which of the following is correct regarding the excretion ?

Which of the following is correct regarding teflon ?

Which of the following is correct regarding the excretion ?

Which of the following are correct regarding the given reaction?

Which of the following are correct regarding the given reaction?

Which of the following is correct regarding diastema