Purines and pyrimidines are_________________?
A. Enzymes B. Nitrogenous bases C. Carbohydrates D. Lipids
In solids the temperature is the measure of__________________?
A. Average kinetic energy of molecules B. Vibrational kinetic energy C. Translational kinetic energy D. None of the above
Fruit juices and fizzy drinks such as lemonade are often sold in aluminium cans. What is the most important reason aluminium is a suitable metal ?
A. aluminium can be recycled B. aluminium has very low density C. aluminium is the most abundant metal in the earth crust D. aluminium is resistant to corrosion by organic…
All the transition elements show_________________?
A. Similar physical properties B. Similar chemical properties C. Both A and b D. None
Benzene is a good solvent for__________________?
A. fats B. resins C. iodine D. all the above
If a graph is plotted between temperature on x-axis and volume on y-axis for 1 mole of gas then we get straight line which cuts the temperature exis at________________?
a. 0?C B. 273.16K C. ?273.16 K D. ?273.16?C
When aquious bromine is added to aqueous phenol a creamy white ppt is obtained. What does this reaction show ?
A. phenol is unsaturated B. 2-bromophenol is insoluble in water C. a hydroxy group makes the benzene ring more susceptible to electrophilic attack D. acid-base reaction
The inhaled breath of diabetics patient contain acetone. A medical student wishes to test for diabetes by asking patient to bubble their breath through a reagent ?
A. alkaline aquenous iodine B. aqueous bromine C. Fehling solution D. aqueous NaOH