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Environmental Chemistry Online Solved MCQs
Q.1: When phenol is heated with concentrated nitric acid the product is------- ?
- Picric acid
- o-nitrophenol
- 1 3 5 -trinitro benzene
- p-nitrophenol
A
Q.2: Molecular mass of water (18g) means-------- ?
- 1-mole molecules of water
- 1-gram molecule of water
- 3-gram atoms
- all
D
Q.3: The process of fermentation of starch involve many enzymes the sequence of enzymes used are------- ?
- Diastase-maltase-zymase
- Zymase-maltase-diastase
- Maltase-diastase-zymase
- Diastase-zymase-maltase
A
Q.4: The rectified spirit is--------- ?
- 12% alcohol
- 90% alcohol
- 95% alcohol
- 100% alcohol
C
Q.5: The balanced chemical equation for the reaction which occurs when Be is added to water is------- ?
- Be+2H2O?Be (OH)2+H2
- Be+H2O?Be (OH)2+H2
- Be+H2O?[Be (OH)4]+2+H2
- no reaction
D
Q.6: 1 a.m.u =------------- ?
- 1.6 x 10-27 kg
- 1.6 x 10-24 kg
- 1.6 x 10-26 kg
- 1.6 x 10-28 kg
A
Q.7: Which of the following are isoelectronic species ?
- H+ H H-
- Li+ Na+ K+
- C1- Br- I
- F- Ne Na+
D
Q.8: Which of the following set has all species isoelectronic------- ?
- F – Cl – Br
- Li+1 – Na+1 – K+1
- F – Ne – Na+
- H+ – H- – H
C
Q.9: Which is methyl cyanide------ ?
- CH3NH2
- CH3NO2
- CH3CN
- CH2 = CH – CN
C
Q.10: Which of the following solution has the highest boiling point ?
- 5.85% NaCl Solution
- 18.0 % glucose solution
- 6.0 % urea solution
- All have same boiling point
A
Q.11: Which one of the following is also known as tartaric acid ?
- 2 3-dihydroxy butance 1 4 -dioic acid
- 2 3 -dihydroxy butanedioic acid
- 2 3 -dihydroxy butanioc acid
- 2 2 -dihydroxy butanoic acid
A
Q.12: Which of the following is the formula of chrome red ?
- Pb3 O4
- 2Pb CO3 – Pb (OH)2
- Pb Cr O4 – Pb (OH)2
- Pb2O
A
Q.13: Percentage of calcium in calcium carbonate is-------- ?
- 80%
- 30%
- 40%
- 20%
C
Q.14: 1 mole of electron has mass in microgram--------- ?
- 1.008 x 10-3
- 5.5 x 10-4
- 1.84 x 10-4
- 1.673 x 10-3
B
Q.15: In the van der Waals equation (P + n2a / v2) (v – nb) = nRT which of the following statement is not true ?
- n2a/v correct for the intermolecular forces.
- nb correct for the volume occupied by gas molecules.
- at high densities the equation reduces to the ideal gas law
- all of the above statements are correct.
C
Q.16: K2Cr2O7/H2SO4 generate-------- ?
- Oxygen
- Hydrogen
- Nascent oxygen[O]
- Nascent hydrogen[H]
C
Q.17: For which mechanisms the first step involved is the same ?
- E1 + E2
- E2 + SN2
- E1 and SN1
- SN1 and SN2
C
Q.18: General formula of alkyne is------- ?
- CnH2n + 2
- CnH2n – 2
- CnH2n
- CnH2n + 2
B
Q.19: Solubility product of AgCl is 2.0 x 10-10 mol2 dm-6. Maximum Concentration of Ag+1 ions in the solution is------- ?
- 2.0 x 10-10 mol dm-3
- 1.414 x 10-5 mol dm-3
- 1.0 x 10-10 mol dm-3
- 1.0 x 10-5 mol dm-3
B
Q.20: Equal masses of methane and oxygen are mixed in empty container at 250?(C) The fraction of total pressure exerted by oxygen is------- ?
- one / seventeen
- sixteen / seventeen
- one / three
- two / three
C
