• Chemical Science Test - 6
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Chemical Science Test - 6

Description: GATE
Number of Questions: 15
Created by:
Tags: GATE Addition Reactions Ionic and Covalent Bonding Biochemistry and Molecular Biology Treatment of Sewage Causes of Air Pollution Air Pollution Control General Characteristics of 3d Elements Geometry and Magnetic Properties Color Aromatic Electrophilic Substitution
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Which of the following statements is not correct regarding the treatment of sewage?

  1. Pretreatment may include a sand or grit channel or chamber, where the velocity of the incoming sewage is adjusted to allow the settlement of sand, grit, stones and broken glass.

  2. Coagulation can be carried out by passing ozone through waste water.

  3. In primary treatment, large sized particles are filtered through screens and residual water is subjected to sedimentation.

  4. Secondary treatment involves aerobic digestion of the organic waste.

  5. In tertiary treatment, the waste water is treated with lime to remove phosphate followed by coagulation.

Show answer
Correct Option: B
Explanation:

This option is correct because coagulation can be carried out by adding alum and ferric chloride in waste water.

Which one of the following sets of alloys listed below contains chromium?

  1. Duralumin, magnalium, bell metal

  2. Invar, babbit metal, monel metal

  3. White metal, type metal, gun metal

  4. Nichrome wire, stainless steel, inconel

  5. Solder, wood metal, electron

Show answer
Correct Option: D
Explanation:

This option is correct because nichrome wire, stainless steel and inconel all contain chromium in their alloy composition.

Which one of the following sets comprises of antioxidants?

  1. Abscisic acid, BHA, BHT

  2. Gallic acid, lacithin, abscisic acid

  3. Sodium benzoate, sorbic acid, BHA

  4. BHA, gallic acid, lacithin

  5. Ascorbic acid, citric acid, ascisic acid

Show answer
Correct Option: D
Explanation:

This option is correct because all are antioxidants.

Which of the following statements is not correct?

  1. When ethyne reacts with chlorido(methyl)magnesium, hydrogen is evolved.
  2. OCOCH3 is an ortho-, para- directing group but –COOCH3 is a meta-directing group.
  3. Lindlar catalyst is a heterogeneous catalyst that consists of palladium deposited on calcium carbonate or barium sulfate and treated with various forms of lead.

  1. Only 1

  2. Only 2

  3. Only 3

  4. 2 and 3

  5. 1 and 2

Show answer
Correct Option: C
Explanation:

This option is wrong because Lindlar catalyst is a heterogeneous catalyst that consists of palladium deposited on calcium carbonate or barium sulfate and treated with various forms of lead, is true statement.

Which one of the following sets of metal atoms exhibits the maximum possible oxidation state?

  1. Ta, Nb, V

  2. Cr, Fe, Pt

  3. Ir, Mo, Rh

  4. Tc, W, Re

  5. No, Md, Es

Show answer
Correct Option: D
Explanation:

This option is correct because all metal atoms can exhibit a maximum oxidation state of +7.

Which of the following is not a consequence of green house effect?

  1. Climate conditions will be changed, resulting in global warming.

  2. The incident of infectious diseases is likely to increase.

  3. In the Solar System, Mars, Venus, and the Moon Titan also exhibit greenhouse effects.

  4. Plants in warmer climates with adequate rainfall would grow faster.

  5. Malaria will be controlled as mosquitoes will not survive.

Show answer
Correct Option: E
Explanation:

This option is correct because higher global temperature increase the risk of infectious diseases like malaria as the mosquitoes will increase in population.

Which of the following statements about control of particular pollution is/are not correct?

  1. Gravity settling chamber removes larger particles from the air.
  2. In electrostatic precipitator, the particulates acquire positive change, they are then attracted by the negative electrodes and removed.
  3. Cyclone collector removes fine particles in the diameter range 5-20 micron.
  4. Wet scrubbers are used to wash away all types of particulates.

  1. 1 and 2

  2. 1 and 3

  3. 2 only

  4. 4 only

  5. 2 and 4

Show answer
Correct Option: C
Explanation:

This option is correct because particulates acquire negative charge and are attracted by the positive electrodes.

Assertion: When white light falls on a substance, it absorbs a particular colour in the visible region. Reason: The colour of the absorbed light is the colour of the substance.

Directions: In each of the questions given below, there are two statements labeled as Assertion (A) and Reason (R). Mark your answer as per the codes provided below:

A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
E. Both A and R are false.

  1. Both A and R are true and R is the correct explanation of A.

  2. Both A and R are true but R is not the correct explanation of A.

  3. A is true but R is false.

  4. A is false but R is true.

  5. Both A and R are false.

Show answer
Correct Option: C
Explanation:

This option is correct because when white light falls on a substance, it absorbs a particular colour in the visible region (4000-7000 Ǻ) and reflects the remaining light which has the colour complementary to that of the absorbed light. The colour of the reflected light is the colour of the substance.

Which one of the following sets of molecules has all three types of bonds i.e, electrovalent, covalent and coordinate bonds?

  1. CuSO4.5H2O, NH4Cl, K4[Fe(CN)6]

  2. NH3.BF3, KNH2, AgNO3

  3. [Co(NH3)3Cl3], [Co(NH3)6]Cl3, [Co(NH3)5Cl]Cl2

  4. K3[Fe(CN)6], H3O+, [Cu(NH3)4]SO4

  5. S8, P4, O3

Show answer
Correct Option: A
Explanation:

This option is correct because all molecules have all three types of bonds i.e., electrovalent, covalent and coordinate bonds.

Which one of the following pairs of transition metal complexes has the maximum magnetic moment?

  1. [Fe(CN)6]-4 and [Fe(CN)6]-3

  2. [Co(NCS)6]+3 and [Fe(NCS)6]+2

  3. [Zn(H2O)6]+2 and [Ni(Br)4]-2

  4. [Ni(CN)4]-2 and Co(NH3)6]+2

  5. [Cr(NH3)6]+3 and [Co(NH3)6]+3

Show answer
Correct Option: B
Explanation:

This option is correct because both the complexes have 4 unpaired electrons and both of these have the maximum magnetic moment.

Which of the following statements is/are true? A. C6H5COOH can be extracted from water using C2H5OH. B. In column chromatography, the more highly absorbed component is eluted with less polar solvents. C. Number of replaceable OH- ions present in one molecule of a base is called its acidity.

  1. Only A

  2. Only B

  3. Only C

  4. A and B

  5. B and C

Show answer
Correct Option: C
Explanation:

This option is correct because number of replaceable hydroxyl ions present in one molecule of a base is called its acidity, is a true statement.

Which of the following statements is/are true? A. 1-chloro-2, 3-pentadiene has no chiral carbon atoms, yet it is a chiral molecule. B. A newly discovered compound is thought to be chiral, but shows no rotation in a specific solvent. Hence, the compound is assuredly achiral. C. When a chiral molecule reacts to give a chiral molecule, the product is always racemic.

  1. Only A

  2. Only B

  3. Only C

  4. Both A and C

  5. Both B and C

Show answer
Correct Option: A
Explanation:

This statement is true.

Match the List I (metal alloys) with List II (their uses):

 
List I
List II
i. Tungsten steel a. Clock pendulums
ii. Manganese steel b. Cutlery
iii. Chrome steel c. Cables
iv. Nickel steel d. Springs
v. Invar e. Rail road tracks
f. Permanent magnet

  1. i - d, ii - e, iii - b, iv - c, v - a

  2. i - b, ii - c, iii - a, iv - e, v - d

  3. i - a, ii - b, iii - e, iv - d, v - c

  4. i - f, ii - b, iii - d, iv - e, v - a

  5. i - e, ii - f, iii - c, iv - d, v - b

Show answer
Correct Option: A
Explanation:

Tungsten steel - springs, manganese steel - rail road tracks, chrome steel - cutlery, nickel steel - cables and invar - clock pendulums. Thus, this option is correct.

Match the column I with column II.

 
Column I Column II
A. Artificial camphor 1. CCl3NO2
B. Westron 2. CF3CHClBr
C. Chloropicrin 3. C2Cl4
D. Halothane 4. C2H2Cl4
E. Westrosol 5. C2Cl6

  1. D - 5, E - 4, A - 1, B - 2, C - 3

  2. A - 5, B - 4, C - 1, D - 2, E - 3

  3. E - 5, A - 4, B - 1, C - 2, E - 3

  4. C - 5, D - 4, E - 1, A - 2, B - 3

  5. B - 5, C - 4, D - 1, E - 2, A - 3

Show answer
Correct Option: B
Explanation:

Correct answer. Artificial camphor - C2Cl6, Westron - C2H2Cl4, Chloropicrin - CCl3NO2, Halothane - CF3CHClBr and Westrosol - C2Cl4.

Assertion: Both cyclopropane and propene gives addition reactions readily. Reason: Cyclopropane and propene are isomers of each other.

Directions: In each of the questions given below, there are two statements labeled as Assertion (A) and Reason (R). Mark your answer as per the codes provided below:

A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
E. Both A and R are false.

  1. Both A and R are true and R is the correct explanation of A.

  2. Both A and R are true but R is not the correct explanation of A.

  3. A is true but R is false.

  4. A is false but R is true.

  5. Both A and R are false.

Show answer
Correct Option: B
Explanation:

This option is correct because propene, being unsaturated, undergoes addition reactions. In contrast, cyclopropane being strained readily undergoes ring cleavage to yield addition products.

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