Everyday Science MCQs

5120 MCQs  (Page 163 of 512)

Which of the following is the formula of chrome red ?
A. Pb3 o4
B. 2pb co3 – pb (oh)2
C. Pb cr o4 – pb (oh)2
D. Pb2o
Regular coiling or zigzagging of polypeptide through hydrogen bonding is its___________________?
A. Quantum structure
B. Secondary structure
C. Tertiary structure
D. Primary structure
In the van der Waals equation (P + n2a / v2) (v – nb) = nRT which of the following statement is not true ?
A. N2a/v correct for the intermolecular forces.
B. Nb correct for the volume occupied by gas molecules.
C. At high densities the equation reduces to the ideal gas law
D. All of the above statements are correct.
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
Purines and pyrimidines are_________________?
A. Enzymes
B. Nitrogenous bases
C. Carbohydrates
D. Lipids
All the transition elements show_________________?
A. Similar physical properties
B. Similar chemical properties
C. Both a and b
D. None