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Chemistry (Mixed)

Description: Chemistry P-Block Elementsp-Block ElementsBasic Concepts of ChemistrySome Basic Concepts of ChemistryPolymersPolymersChemistry in Everyday LifeChemistry in Everyday LifeChemical Bonding and Molecular StructureChemical Bonding and Molecular Structure
Number of Questions: 15
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Tags: Chemistry P-Block Elements p-Block Elements Basic Concepts of Chemistry Some Basic Concepts of Chemistry Polymers Chemistry in Everyday Life Chemical Bonding and Molecular Structure
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Number of atoms in 6 g of water is approximately equal to the number of atoms in ________of H2S.

  1. 3.75 g

  2. 8.5 g

  3. 11.33 g

  4. 17 g

  5. 34 g

Show answer
Correct Option: C
Explanation:

6 g of water =  1/3 mole of water = 1/3 x 6.023 x 1023 molecules of water = 1/3 x 3 x 6.023 x 1023 atoms = 6.023 x 1023 atoms 11.33 g of H2S =  1/3 mole of H2S (approx) = 1/3 x 6.023 x 1023 molecules of H2S = 1/3 x 3 x 6.023 x 1023 atoms = 6.023 x 1023 atoms (approx).

Which of the following compounds is also known as Philosopher’s wool?

  1. ZnO

  2. ZnS

  3. ZnCO3

  4. ZnSO4.7H2O

  5. ZnFe2O4

Show answer
Correct Option: A
Explanation:

The compound zinc oxide (ZnO) is called philosopher's wool.

Which of the following has largest number of atoms?

  1. 36.5 g of HCl

  2. 27 g of N2O5

  3. 33 g of CO2

  4. 9 g of H2O

  5. 28 g of N2

Show answer
Correct Option: C
Explanation:

33 g of CO2  = 0.75 moles of CO2   = 0.75 x 6.023 x 1023 molecules of CO2 = 3 x 0.75 x 6.023 x 1023 atoms = 2.25 x 6.023 x 1023 atoms.

Which of the following are examples of thermosetting plastics?

  1. PTFE
  2. PMMA
  3. PAN
  4. Duroplast
  5. Bakelite Select the correct answer.

  1. 1 and 2

  2. 2 and 3

  3. 3 and 4

  4. 4 and 5

  5. 3, 4 and 5

Show answer
Correct Option: D
Explanation:

Duroplast is a composite thermosetting plastic, a close relative of formica and bakelite.  Bakelite is a thermosetting phenol formaldehyde resin, formed from an elemination reaction of phenol with formaldehyde.

4.48 L of CO2 at NTP corresponds to a. 0.1 mole of CO2 b. 8.8 g of CO2 c. 6.023 x 1023 molecules of CO2 Select the correct answer.

  1. Only a

  2. Only b

  3. Only c

  4. a and b

  5. b and c

Show answer
Correct Option: B
Explanation:

22.4 L of CO2 at NTP = 1 mole of CO2 = 44 g of CO2 4.48 L of CO2 at NTP = 0.2 moles of CO2 = 8.8 g of CO2.

Identify the wrong statement in the following

  1. Ozone layer does not permit infrared radiation from the sun to reach the earth.
  2. Acid rain is mostly because of oxides of carbon and sulphur.
  3. Chlorofluorocarbons are responsible for ozone layer depletion.
  4. Greenhouse effect is responsible for global warming. Select the correct answer.

  1. Only 1

  2. 1 and 2

  3. 1, 2 and 3

  4. 2 and 4

  5. 3 and 4

Show answer
Correct Option: B
Explanation:

Ozone layer does not permit the ultraviolet radiation from the sum to the earth. Acid rain is mostly because of oxides of nitrogen and sulphur.

The type of hybridization exhibited by the C atoms in allene, CH2 = C = CH2, include which of the following I. sp II. sp2 III. sp3 Select the correct answer.

  1. Only I

  2. Only II

  3. Only III

  4. I and II

  5. II and III

Show answer
Correct Option: D
Explanation:

In allene, CH2=C=CH2, first and third carbon atoms are sp2 hybridized while second carbon is sp hybridized.

X has a half life of 12.5 years. If you start with 200 grams of it, approximately how much will remain after 75 years?

  1. 50 g

  2. 25 g

  3. 12.5 g

  4. 3.125 g

  5. 0.781 g

Show answer
Correct Option: D
Explanation:

Ending Amount = Beginning Amount / 2(time / half-life) Ending Amount = 200 / 2(75/12.5) Ending Amount = 200 / 2(6) Ending Amount = 200/64 Ending Amount = 3.125g  

Starting with 100 grams of a substance P, which has a half life of 91 days. How much time will it take until only 10 grams remain?

  1. 9.1 days

  2. 18.2 days

  3. 27.4 days

  4. 45.5 days

  5. 91 days

Show answer
Correct Option: C
Explanation:

Elapsed time = half life x log (beginning amount / ending amount) /log 2 Elapsed time = 91 x [log (100/10) / 0.30103] Elapsed time = 91 x (1/0.30103) Elapsed time = 27.4 days (approx).

Which of the following statements are TRUE?

  1. The protecting power of lyophilic colloidal sol is expressed in terms of gold number.
  2. Rate of physical adsorption increase with decrease in temperature.
  3. In Freundlich Adsorption isotherm, the value of 1/n is 0 in case of physical adsorption and 1 in case of chemisorptions.
  4. In Langmuir's model of adsorption of a gas on a solid surface the mass of gas striking a given area of surface is independent of the pressure of the gas. Select the correct answer.

  1. only 1 and 2

  2. 1, 2 and 3

  3. 1 and 4

  4. 2 and 3

  5. 3 and 4

Show answer
Correct Option: A
Explanation:

Only statement 1 and 2 are true statements. The protecting power of lyophilic colloidal sol is expressed in terms of gold number. Rate of physical adsorption increase with decrease in temperature.

Which of the following is an incorrect match?

  1. Jeweller's borax: Na2B4O7.10H2O

  2. Fool's gold: FeS2

  3. Gymnastic’s chalk: MgCO3

  4. Photographer’s hypo: Na2S2O3.5H2O

  5. Baker's ammonia: (NH4)2CO3

Show answer
Correct Option: A
Explanation:

Jeweller's borax (Na2B4O7. 5H2O) is the borax,  which contains five molecules of water of crystallisation.

Which of the following are obtained by Solvay process? (1) Na2CO3 (2) CaCl2 (3) H2SO4 (4) HNO3 Select the correct answer.

  1. Only 1

  2. 1 and 2

  3. 1 and 3

  4. 1 and 4

  5. 2, 3 and 4

Show answer
Correct Option: B
Explanation:

The Solvay process or ammonia-soda process is the major industrial process for the production of soda ash (Sodium carbonate).  The principal byproduct of the Solvay process is calcium chloride (CaCl2) in aqueous solution.

Which of the following statements are FALSE?

  1. Solid CO2 is known as dry ice.
  2. Producer gas is CO + H2.
  3. Phosgene is carbonyl chloride.
  4. Lead pencil contains 25% Pb. Select the correct answer.

  1. 1 and 2 only

  2. 1 and 3

  3. 2 and 3

  4. 2 and 4

  5. 3 and 4

Show answer
Correct Option: D
Explanation:

Producer gas is CO + N2. The core of lead pencil is made of non-toxic graphite and does not contain lead.

Which of the following minerals do not contain sulphur?

  1. Cinnabar 2. Gypsum
  2. Lithopone 4. Talc Select the correct answer.

  1. 1 and 2

  2. 2 and 3

  3. 2, 3 and 4

  4. 2 and 4

  5. Only 4

Show answer
Correct Option: E
Explanation:

Talc is a mineral composed of hydrated magnesium silicate with the chemical formula H2Mg3(SiO3)4 or Mg3Si4O10(OH)2. All of the above given minerals except Talc contains sulphur in its structure.

Which of the following have two unpaired electrons in antibonding molecular orbitals?

  1. NO

  2. C2

  3. O2

  4. N2

  5. F2

Show answer
Correct Option: E
Explanation:

F2 (18 e-) : σ1s2 ϭ*1s2 ϭ2s2 ϭ*2s2 ϭ2pz2 π2px2 π2py2 ϭ*2pz2 π*2px1 π*2py1 Two unpaired electrons in antibonding molecular orbitals.

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