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Mixed Test (Chemistry)

Description: GATE Coordination Compounds and OrganometallicsCoordination CompoundsChemistry - CYAlkaline Earth MetalsAlkaline Earth MetalsPolymersPolymersP-Block Elementsp-Block ElementsGroup 17 ElementsGroup 17 Elements
Number of Questions: 20
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Tags: GATE Coordination Compounds and Organometallics Coordination Compounds Chemistry - CY Alkaline Earth Metals Polymers P-Block Elements p-Block Elements Group 17 Elements
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Which of the following is a pair of square planar complexes?

  1. [PtCl4]2- and [ZnCl4]2-

  2. [Ni(CN)4]2- and [CoCl4]2-

  3. [ZnCl4]2- and [Ni(CN)4]2-

  4. [CoCl4]2- and [PtCl4]2-

  5. [PtCl4]2- and [Ni(CN)4]2-

Show answer
Correct Option: E
Explanation:

d8 ions form square planar complexes with strong field ligands. For example, [Ni(CN)4]2-
All the complexes of Pt(II) and Au(II) are square planar. For example, [PtCl4]2-

Which of the following statements are correct?

P. BeCl2 has bridged structure in vapour phase.
Q. Beryllium exhibits coordination number of six. R. BeO is basic in nature. S. Be(OH)2 is amphoteric in nature.

  1. P and Q

  2. P and S

  3. Q and R

  4. Q and S

  5. R and S

Show answer
Correct Option: B
Explanation:

Chlorides of beryllium have Cl–bridged chloride structure in vapour phase. All alkaline earth metal oxides, except BeO, are basic in nature and react with water to form sparingly soluble hydroxides. BeO is amphoteric.

Which of the following statements are false? P. Halogens are good conductors of heat and electricity. Q. All hydrogen halides are colourless gases. R. Pentahalides are more covalent than trihalides. S. ICl more reactive than I2.

  1. P and Q

  2. P and R

  3. P and S

  4. Q and R

  5. R and S

Show answer
Correct Option: A
Explanation:

Halogens are poor conductors of heat and electricity. HF is a colourless liquid which boils at 19.5°C, while all the other hydrogen halides are colourless gases. HF is a liquid due to the occurrence of extensive hydrogen bonding between their molecules.

Among the following complexes, the largest crystal field splitting occurs in

  1. [CrCl6]3-

  2. [Cr(H2O)6]3+

  3. [Cr(NH3)6]3+

  4. [Cr(CN)6]3-

  5. [Cr(en)3]3+

Show answer
Correct Option: D
Explanation:

The oxidation state and the strength of the ligands determine the extent of crystal field splitting. The higher the oxidation state or the stronger the ligand, the larger will be the splitting. Ligands are classified as strong or weak based on the spectrochemical series: I- < Br- < Cl- < SCN- < F- < OH- < ox2-< ONO- < H2O < SCN- < EDTA4- < NH3 < en < NO2- < CN- CN-  is among one of the strongest field ligands. Crystal field splitting will be the highest in [Cr(CN)6]3-.

Which of the following is a pair of amorphous polymers?

  1. Polyvinyl alcohol and Polyvinyl butyral

  2. Polyethylene and Neoprene

  3. Neoprene and Terylene

  4. Polymethyl methacrylate and Polyvinyl butyral

  5. Polyvinyl alcohol and Polymethyl methacrylate

Show answer
Correct Option: D
Explanation:

Polymethyl methacrylate and Polyvinyl butyral: Both are amorphous polymers.

Which of the following complexes is not correctly named?

  1. Na3[Ag(S2O3)2]: Sodium bis(thiosulphato)argentite(I)

  3. [Pt(py)4][PtCl4]: Tetrapyridineplatinum(II)tetrachloroplatinate

  4. Li[AlH4]: Lithium tetrahydridoaluminate(III)

  5. [Zn(NCS)]2+: Tetrathiocyanato-N-zinc(II) cation

Show answer
Correct Option: B
Explanation:

Correct IUPAC name of [Fe(C5H5)2] is bis(cyclopentadienyl)iron(II).

Which of the following pairs represent isostructural species? P. NF3, NO3- Q. BF3, H3O+ R. NF3, H3O+ S. NO3-, BF3

  1. P and Q

  2. P and R

  3. P and S

  4. Q and R

  5. R and S

Show answer
Correct Option: E
Explanation:

NF3 and H3O+: Both are pyramidal (isostructural). NO3- and BF3: Both are trigonal planar (Isostructural).

Which of the following species is/are diamagnetic in nature?

  1. H2
  2. H2+
  3. H2

  1. 1 only

  2. 2 only

  3. 3 only

  4. 1 and 2

  5. 2 and 3

Show answer
Correct Option: A
Explanation:

H2 (2 e-) : σ1s2 No unpaired electrons, so H2 is diamagnetic.

Which of the following are isoelectronic species?

  1. CN-
  2. NO+
  3. O2+
  4. O2-
  5. F2

  1. 1 and 2

  2. 1 and 4

  3. 2, and 3

  4. 3 and 4

  5. 4 and 5

Show answer
Correct Option: A
Explanation:

CN- : (6+7+1) e-= 14 e- NO+ : (7+8-1) e-= 14 e- CN- and NO+ have the same number of electrons (isoelectronic species).

Which of the following statements are correct regarding the properties of ionic compounds? P. Ionic compounds have high melting and boiling points. Q. Ionic compounds in their molten state do not conduct electricity. R. Ionic bonds are directional. S. They are highly soluble in polar solvents.

  1. P and Q

  2. P and R

  3. Q and R

  4. Q and S

  5. R and S

Show answer
Correct Option: C
Explanation:

Ionic solids are good insulators. Ionic compounds form crystals.

Which of the following statements are true? P. Bond angle in PH4+ is lower than that in PH3. Q. H2O is a liquid and H2S a gas. R. NH3 forms hydrogen bond but PH3 does not. S. NH3 is a stronger reducing agent than BiH3.

  1. P and Q

  2. P and R

  3. Q and R

  4. Q and S

  5. R and S

Show answer
Correct Option: C
Explanation:

H2O has oxygen as the central atom. Oxygen has smaller size and higher electronegativity as compared to sulphur. Therefore, there is extensive hydrogen bonding in H2O, which is absent in H2S.  Hence, H2O exists as a liquid while H2S as a gas. Nitrogen is highly electronegative as compared to phosphorus. This causes a greater attraction of electrons towards nitrogen in NH3 than towards phosphorus in PH3. Hence, NH3 form hydrogen bond but PH3 does not.

Which of the following statements are true? P. Hybridization of the central atoms in NH3 and H2O are sp3. Q. CO2 has bent shape while SO2 is linear. R. SF6 is octahedral and F–S–F bond angle is 90o. S. BeCl2 has dipole moment.

  1. P and Q

  2. P and R

  3. P and S

  4. Q and R

  5. R and S

Show answer
Correct Option: C
Explanation:

Central atom in both NH3 (3 bond pairs, 1 lone pair) and H2O (2 bond pairs, 2 lone pairs) are sp3 hybridized. BeCl2 is non-polar molecule.

Which of the following pairs can form a dative covalent bond to each other? P. NH3 and H+ Q. CH4 and AlCl3 R. NH3 and BF3 S. H2O and H+

  1. P and Q

  2. Q and R

  3. P, Q and R

  4. P, R and S

  5. Q, R and S

Show answer
Correct Option: C
Explanation:

NH3 and H+ form dative covalent bond: [H3N→H]+ CH4 and AlCl3 does not form dative bond because methane has no lone pair of electrons to share with AlCl3. NH3 and BF3 dative covalent bond: H3N→BF3

In which of the following molecules central atom has no lone pairs?

  1. IF7
  2. XeF6
  3. SF6
  4. ClF5
  5. PF5

  1. 1, 2 and 3

  2. 1, 3 and 5

  3. 2, 3 and 4

  4. 2, 4 and 5

  5. 3, 4 and 5

Show answer
Correct Option: B
Explanation:

IF7 has 7 shared pairs and no lone pair and sp3d3 hybridization. SF6 has 6 shared pairs and no lone pair and sp3d2 hybridization. PF5 has 5 shared pairs and no lone pair and sp3d hybridization.

Which of the following pairs of species have the same bond order?

  1. O2--
  2. NO+
  3. CN-
  4. CO

  1. 1 and 2

  2. 1 and 4

  3. 1, 2 and 3

  4. 1, 3 and 4

  5. 2, 3 and 4

Show answer
Correct Option: E
Explanation:

Species which have the same number of total electrons will have the same bond order. O2-- has 18 electrons and bond order 1. NO+, CN-, and CO each has 14 electrons having bond order 3.

Match column - I (Trade name of polymer) with column – II (Monomer unit) and select the correct option.

 
Column – I Column – II
P. Plexiglass 1. Propenenitrile
Q. Delrin 2. Methanal
R. Orlon 3. Tetrafluoroethene
S. Teflon 4. Methyl methacrylate

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

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

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

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

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

Show answer
Correct Option: C
Explanation:

Plexiglass is trade name of polymethyl methacrylate. It is a polymer of methyl methacrylate. Delrin is trade name of Polyoxymethylene (also known as acetal, polyacetal and polyformaldehyde). It is a polymer of methanal. Orlon is trade name of polyacrylonitrile. It is a polymer of acrylonitrile. Teflon is trade name of polytetrafluoroethylene. It is a polymer of tetrafluoroethene.

Which one of the following is the correct set with respect to molecule, hybridization and shape?

  1. XeF2, sp3d, bent

  2. NH3, sp2, pyramidal

  3. AlCl3, sp2, trigonal planar

  4. SF4, sp3, tetrahedral

  5. SO4--, sp3d, square planar

Show answer
Correct Option: C
Explanation:

AlCl3 Hybridization: sp2, Geometry: Trigonal planar

In which of the following ionization processes has the magnetic behavior changed?
P. C2 → C2+ Q. O2 → O2+ R. N2 → N2+ S. F2 → F2-

  1. P and Q

  2. P and R

  3. Q and R

  4. Q and S

  5. R and S

Show answer
Correct Option: C
Explanation:

O2 (16 e-) : σ1s2 σ*1s2 σ2s2 σ*2s2 σ2pz2 π2px2 π2py2 σ *2pz2; diamagnetic O2+ (15 e-) : σ1s2 σ*1s2 σ2s2 σ*2s2 σ2pz2 π2px2 π2py2 σ *2pz1; paramagnetic

N2 (14 e-) : σ1s2 σ*1s2 σ2s2 σ*2s2 σ2pz2 π2px2 π2py2; diamagnetic N2+ (13 e-) : σ1s2 σ*1s2 σ2s2 σ*2s2 σ2pz2 π2px2 π2py1; paramagnetic

Assertion (A): 4f and 5f orbitals are equally shielded. Reason (R): As a result of lanthanide contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.

In the following question there are two statements, Assertion (A) and Reason (R). Consider both the statements independently and mark your answer:
1. If A and R both are correct and R is correct explanation of A.
2. If A and R both are correct and R is not correct explanation of A.
3. If A is correct and R is incorrect.
4. If A is incorrect and R is correct.
5. If A and R both are incorrect.

  1. 1

  2. 2

  3. 3

  4. 4

  5. 5

Show answer
Correct Option: E
Explanation:

4f orbital electrons are shielded more than 5f orbital electrons. The atomic radii of 4d and 5d elements down the group become quite similar due to lanthanide contraction. Due to the similarity in the size of the elements of the two series, the elements of 2nd (4d series) and 3rd series (5d series) resemble each other more closely that do the elements of the 1st (3d series) and 2nd transition series (4d series).

Assertion (A): NH4+ and BF4- are isostructural. Reason (R): Central atom in both NH4+ and BF4- are sp3 hybridized.

In the following question there are two statements, Assertion (A) and Reason (R), consider both the statements independently and mark your answer:
1. If A and R both are correct and R is correct explanation of A.
2. If A and R both are correct and R is not correct explanation of A.
3. If A is correct and R is incorrect.
4. If A is incorrect and R is correct.
5. If A and R both are incorrect.

  1. 1

  2. 2

  3. 3

  4. 4

  5. 5

Show answer
Correct Option: A
Explanation:

Both assertion and reason statements are correct. Reason statement is correct explanation of assertion. Both NH4+ and BF4- have tetrahedral shape (isostructural). Central atom in both NH4+ and BF4- are sp3 hybridized.

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