Chemistry

Which of the following statements is true of an endothermic reaction?

I. Heat is absorbed from the surrounding II. The heat content of the products is more than that of the…

6 years ago

The condensation of several amino acid molecules gives?

A. long chain alkanoic acids B. secondary alkanols C. alkanoates D. proteins Correct Answer: Option D D. proteins

6 years ago

When ammonium trioxocarbonate (IV) solution is added to separate solutions of calcium, zinc and sodium salt precipitate could be formed in the case of?

A. calcium only B. zinc only C. calcium and znic only D. sodium and zinc only Correct Answer: Option C…

6 years ago

What of the following pairs of acid and base will produce a solution with a pH less than 7 at equivalence point?

A. HNO3 and NaOH B. H2SO4 and KOH C. HCI and Mg(OH)2 D. HNO3 and KOH Correct Answer: Option C…

6 years ago

Which of the following compounds is a soapless detergent?

A. C12H25OSO3Na B. C17H35COONa C. C6H5OH3 D. C4H9COOC2H5 Correct Answer: Option A A. C12H25OSO3Na

6 years ago

The mass of 800cm³ of a gas X at s.t.p. is 1.0g. What is the molar mass of X? [1 mole of a gas at s.t.p occupies 22.4dm³]

A. 18.0g mol‾¹ B. 22.4g mol‾¹ C. 28.0gmol‾¹ D. 36.0gmol‾¹ Correct Answer: Option C C. 28.0gmol‾¹ Explanation The mass of…

6 years ago

What is the IUPAC name of CH3CH2COOCH3?

A. Ethylethanoate B. Methylethanoate C. Methylpropanoate D. Propylmethanoate Correct Answer: Option C C. Methylpropanoate

6 years ago

Consider the cell represented below: Zn/Zn²+(aq) // Cu²+(aq) / Cu(s). Which of the following statements is correct about the cell

A. Zn is oxidized to Zn²+ B. Cu is oxidized to Cu²+ C. It is an electrolytic cell D. each…

6 years ago

An orange drink concentrate is suspected to contain traces of poisonous green dye and a harmless dye having the same boiling point. Which of the following techniques is most suitable for isolating the dyes?

A. Fractional distillation B. Paper chromatography C. Coagulation D. Recrystallization Correct Answer: Option B B. Paper chromatography

6 years ago

Which of the following factors that affect the rate of chemical reactions can be explained in terms of the collision theory?

l. concentration ll. pressure lll. temperature lV catalyst A. l and ll only B. l, ll and lll only C.…

6 years ago