List of top Environmental Sciences Questions on Physical and Chemical Science

Match the pathogens with their associated diseases:

List IList II
A. Threadworm --- III. Strongyloidiasis
B. Cryptosporidium species --- IV. Diarrhea
C. Roundworm --- I. Ascariasis
D. Whipworm --- II. Trichuriasis		III. Strongyloidiasis
IV. Diarrhea
I. Ascariasis
II. Trichuriasis

Match the type of equilibrium with typical examples:

List IList II
A. Oxidation/Reduction Equilibrium (Kredox) --- III. MnO4- + 5Fe2+ + 8H+ ⇌ Mn2+ + 5Fe3+ + 4H2O
B. Heterogeneous Equilibrium (Ksp) --- IV. BaSO4(s) ⇌ Ba2+ + SO4 2-
C. Distribution Equilibrium (Kd) --- I. I2(aq) ⇌ I2(org)
D. Dissociation of weak Acid (Ka) --- II. CH3COOH + H2O ⇌ H3O+ + CH3COO-		III. MnO4- + 5Fe2+ + 8H+ ⇌ Mn2+ + 5Fe3+ + 4H2O
IV. BaSO4(s) ⇌ Ba2+ + SO4 2-
I. I2(aq) ⇌ I2(org)
II. CH3COOH + H2O ⇌ H3O+ + CH3COO-

Which of the following elements in the periodic table are considered as metalloids? A. P B. As C. Si D. S E. Ge
Which of the following species act as Lewis Acid? A. F$^-$ B. H$^+$ C. AlCl$_3$ D. BCl$_3$ E. H$_2$O
What will be the energy of 1 mole of photons having a wavelength of 200 nm?
Planck’s constant, \( h = 6.6 \times 10^{-34} \, \mathrm{Js} \) and Speed of light, \( c = 3.0 \times 10^8 \, \mathrm{ms^{-1}} \)
A black body has a temperature of 2900 K. The wavelength of peak emission ($λ_{max}$) of the radiation emitted from it is approximately equal to:
Cooking pans made from which of the following metals would need less heat to achieve a certain cooking temperature?
Match List I with List II:
LIST I (Experiment)LIST II (Conclusion)
A. Photoelectric effectI. Ether medium does not exist
B. Michelson-MorleyII. Light is made up of photons
C. Stern-GerlachIII. Quantization of electronic orbit
D. Franck-HertzIV. Electron spin moment
Choose the correct answer from the options given below:
Arrange the following II B (or 12) group elements in the increasing order of their Pauling electronegativities:
Elements:
A. Zn
B. Hg
C. Cd
Choose the correct answer from the options given below:
What will be the molar concentration of ammonium ion in a 100 ppb ammoniacal solution?
In which of the following pairs of chemical species does sulfur (S) not have the same oxidation number?
Which of the following chemical species will dominantly exist in water having a pH of less than 5?
Which of the following phosphate species does not exist in water?
When ice starts melting from 0°C to 8.5°C, its density will:
What will be the unit of equilibrium constant for the following reaction?
CH3COCH3 + HCN ⇌ CH3C(OH)(CN)CH3
A sound pressure level of 40 decibels is equivalent to a sound pressure of:
A sample has an absorbance of 2. Its transmittance would be:
Which of the following is a polar solvent?
An analyst reported 40.9 ppm Na in all 10 analyses of the standard solution having a true value of 40.11 ± 0.3 ppm. This data is: