Chemistry 14 th April

1.     What is the exact relationship between the two hydrogen atoms?

• homotopic  

• heterotopic

• diastereotopic

• enantiotopic

-------- is a sulfur containing amino acid

• valine

• methionine

• serine

• tyrosine

1.     Trans polyisoprene is called ---------.

• valcunized rubber

• Gutta-percha

• natural rubber

• polyurathane

When the peptide chain has 2 to 9 amino acids it is known as --------

• polypeptide

• oligopeptide

• nonapeptide

• dipeptide

1.     Which of the following is a condensation polymer?

• polystyrene

• HDPE

• PVC

• Nylon 66

If an element is diatomic it should have a subscript of___

• 1, always

• 2, only when it is an element

• it shouldn't have a subscript, it should have a coefficent

• 2, when bonded in a compound

What is the charge of Iron in this compound. (Hint: think criss cross method):

Fe₃(PO₄)₂

• 3+

• 2+

• 1+

• 6+

Fill in the blank. (Copper has a charge of 2+)

Cu+ AgNO₃ → Ag + _____

• Cu(NO₃)₂

• CuNO₃

• CuAg

• Cu