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Chemistry - Mixed Test

Description: GATE
Number of Questions: 15
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Tags: GATE.ENGINEERING Principle and Process of Extraction of Elements Extraction of Crude Metal from Concentrated Ore Coordination Compounds and Organometallics Coordination Compounds Alkaline Earth Metals Isomerism Isomerism in Coordination Compounds Introduction, Ligands and Coordination Number Definitions of Some Important Terms of Coordination Compounds
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Baryta water is ________.

  1. Ba(OH)2

  2. Mg(OH)2

  3. CaH2

  4. Ca(OH)2

  5. None of these

Show answer
Correct Option: A
Explanation:

This option is correct because the barium is reacting with water to formed barium hydroxide. This is called baryta water.

By which of the following process purification of Al is done?

  1. Hoop’s process

  2. Wet process

  3. Van-Arkel process

  4. Mond process

  5. None of these

Show answer
Correct Option: A
Explanation:

This option is correct, because this process is for electrolytic refining of Al. The electrolytic cell consists of three liquid layers of different gravities. The top layer of pure Al acts as cathode. The bottom layer; molten impure Al acts as anode. The middle layer is fused cryolite and barium fluoride. It acts as an electrolyte. When current flows, Al ions from the middle layer are discharged at the cathode.

When plaster of paris is heated at 200oC it is converted in to anhydrous calcium. This is known as ___________.

  1. dead burnt

  2. slaked lime

  3. slaked lime

  4. quick lime

  5. none of these

Show answer
Correct Option: A
Explanation:

This option is correct, because plaster of paris when heated above 200oC is converted in to anhydrous calcium sulphate. This anhydrous is known as dead burnt. Because it does not set like plaster of paris when moistened with water.

Which of the following compound has 4.9 BM magnetic moment?

  1. Hg[Co(CNS)4]+

  2. [Fe(diph)3]+++

  3. K3[Cr(CNS)6]

  4. [MnBr4]2-

  5. None of these

Show answer
Correct Option: A
Explanation:

This option is correct, because the octahedral complex of the Co possess the magnetic moment 4.9 BM. It would be concluded that the Co is in a bivalent state and occupies 3d7 and the bonding is free spin types, corresponding to n = 3.

The composition of electron alloy is ________.

  1. Cu and Zn

  2. Cu and Sn

  3. Pb and Sn

  4. Mg and Zn

  5. None of these

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Correct Option: D
Explanation:

This option is correct because the composition of Mg and Zn is the composition electron alloy.

Bone ash belongs to _________.

  1. Calcium phosphate

  2. Potassium ammonium hydrogen phosphate

  3. Calcium ammonium nitrate

  4. 2 and 3 correct

  5. None of these

Show answer
Correct Option: A
Explanation:

This option is correct because the CaO (basic flux) which reacts with P2O5 to give calcium phosphate is called bone ash.

The complexes [Co(NH3)4H2OCl]Br2 and [Co(NH3)4Br2]Cl.H2O are example of

  1. Ionization isomerism

  2. Linkage isomerism

  3. Geometrical isomerism

  4. Optical isomerism

  5. None of these

Show answer
Correct Option: A
Explanation:

This option is correct because these complexes show the feature of the ionization isomers.

The magnetic moment of an octahedral Co(II) complex is 4.0 BM. The electronic configuration of the central metal ions is

  1. 5t2g, 2eg

  2. 6t2g , 1eg

  3. 3t2g, 4eg

  4. 4t2g, -3eg

  5. None of these

Show answer
Correct Option: A
Explanation:

This option is correct, because the Co(II) octahedral complex has 4.0 BM magnetic moment when the Co(II) act as the high spin in nature. Therefore 3 unpaired electrons contribute in t2g and one unpaired electron in eg set. Therefore the magnetic moment  is 4.0 BM.

When the P4O6 reacts with hot water, which salts are formed?

  1. H3PO3

  2. H3PO4 and PH3

  3. HPO3

  4. POCl3 and PO2Cl

  5. None of these

Show answer
Correct Option: B
Explanation:

This option is correct because the P4O6 dissolves in hot water to form orthophosphoric acid phosphine.

The complexes [Co(1, 2 diamminopropane)Cl2]+ and [Co(1, 3 diamminopropane)Cl2]+ represent ____________.

  1. ligand isomers

  2. linkage isomers

  3. ionization isomers

  4. coordination isomers

  5. none of these

Show answer
Correct Option: A
Explanation:

This option is correct, because the complexes have same nature but ligand themselves are capable of existing isomers.

The reaction [Co(NH3)5Cl]+++ -OH giving [Co(OH)(NH3)5]++ follows a mechanistic pathway which is ___________.

  1. SN1

  2. SN2

  3. SN1CB

  4. SE2

  5. None of these

Show answer
Correct Option: B
Explanation:

This option is correct because the complex [CoCl(NH3)5]++ react with -OH in slow step to form the intermediate complex [Co(NH3)5OHCl]+, and again in fast steps the Cl- ion dissociate and form [Co(NH3)5OH]++ complex ion.

Arrange in the increasing order of acidic strength of oxyacid of nitrogen: (A) hyponitrous acid (B) nitrous acid (C) nitric acid (D) pernitric acid

  1. D < C < B < A

  2. C < D < B < A

  3. A < B < C < D

  4. B < A < C < D

  5. None of these

Show answer
Correct Option: C
Explanation:

This option is correct.

The pair of ion that forms complex with coordination number 2 is

  1. Cd(II) and Hg(II)

  2. Cu(II) and Hg(II)

  3. Cd(II) and Hg(I)

  4. Cu(I) and Hg(II)

  5. None of these

Show answer
Correct Option: D
Explanation:

This option is correct, because the Cu(I) and Hg(II) metals ions act as the minimum repulsion in between ligand to formed linear geometry of the complex.

Regarding the two complexes - (A) - [Ni(H2O)6]++ and (B) - [Ni(NH3)6]++, which of the following statement is correct?

  1. Complex (A) is diamagnetic and complex (B) is paramagnetic

  2. Complex (A) is paramagnetic and (B) is diamagnetic.

  3. Both paramagnetic

  4. Both are diamagnetic

  5. None of these

Show answer
Correct Option: C
Explanation:

This option is correct,  because in the both complexes ion Ni(28) is present as Ni++ ions. The Ni atom has valence shell configuration 3d84s2 but Ni++ ions indicate 3d8configuration. The magnetic measurement is complex of the ions paramagnetic it has two unpaired electron. They act as high spin in nature  and it gives rise to sp3d2 hybridization.

For [Ti(H2O)6]3+ maximum absorption is due to d-d transition found at 20000 cm-1. Calculate the crystal field stabilization energy for the complex ions.

    • 20000 cm-1

  2. 4/9 x 20000 cm-1

  3. 8000 cm-1

    • 8000 cm-1

  5. None of these

Show answer
Correct Option: D
Explanation:

This option is correct, because the octahedral high spin complex Ti exhibits trivalent state. It belongs to the 3d1 orbital which split in to t2g and eg set. The electron is istributed in 1t2g and 0eg. Hence,  CFES = [- 0.4p + 0.6q] Dq + mP, here p = Number of electron in t2g, q = Number of electron in eg, set Dq = 20000 cm-1 m = Number of paired electron, mean pairing energy. Calculation - [- 0.4 x 1 + 0.6 x 0] 20000 cm-1 + 0 = - 0.4 x 20000 cm-1 = - 8000 cm-1

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