Chemistry (Test 5)

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Chemistry

Chemistry
| Some Basic Concepts of Chemistry | | Structure of Atom | | Classification of Elements and Periodicity in Properties | | Chemical Bonding and Molecular Structure | | States of Matter | | Thermodynamics | | Equilibrium | | Redox Reactions | | Hydrogen | | The s-Block Elements | | The p-Block Elements | | Organic Chemistry Some Basic Principles and Techniques | | Hydrocarbons | | Environmental Chemistry | | Solid State | | Chemistry Solutions | | Electrochemistry | | Chemical Kinetics | | Surface Chemistry | | General Principles and Processes of Isolation of Elements | | The d- and f- Block Elements | | Coordination Compounds | | Haloalkanes and Haloarenes | | Alcohols Phenols and Ethers | | Aldehydes Ketones and Carboxylic Acids | | Organic compounds containing Nitrogen | | Biomolecules | | Polymers | | Chemistry in Everyday Life | | UNIT 1: Basic Concepts of Chemistry and Chemical Calculations | | UNIT 2: Quantum Mechanical Model of Atom | | UNIT 3: Periodic Classification Of Elements | | UNIT 4: Hydrogen | | UNIT 5: Alkali and Alkaline Earth Metals | | UNIT 6: Gaseous State | | UNIT 7: Thermodynamics | | Unit I: Metallurgy | | Unit II: p-Block Elements I | | Unit III: p-Block Elements II | | Unit IV: Transition and Inner Transition Elements | | Unit V: Coordination Chemistry | | Unit VI: Solid State | | Unit VII: Chemical Kinetics |
Q.1

For the reaction, 2NH3 → N2 + 3H2


then the relation between k1, k2 and k3 is
A. k1 = k2 = k3
B. k1 = 3k2 = 2k3
C. 1.5 k1 = 3 k2 = k3
D. 2 k1 = k2 = 3 k3
Answer : Option C
Explaination / Solution:


(3/2)k1 =  3k2 = k3

1.5 k1 = 3k2 = k3


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Q.2

Predict the rate law of the following reaction based on the data given below

2A + B → C + 3D



A. rate = k [ A]2 [B]
B. rate = k [ A][B]2
C. rate = k [ A][B]
D. rate = k [ A]1/2 [B]3/2
Answer : Option B
Explaination / Solution:




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Q.3
After 2 hours, a radioactive substance becomes (1/16)th of original amount. Then the half life ( in min) is
A. 60 minutes
B. 120 minutes
C. 30 minutes
D. 15 minutes
Answer : Option C
Explaination / Solution:


4t1/2 = 2 hours

t1/2 = 30 min


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Q.4
The composition of a sample of wurtzite is Fe0.93 O1.00 what % of Iron present in the form of Fe3+?
A. 16.05%
B. 15.05%
C. 18.05%
D. 17.05%
Answer : Option B
Explaination / Solution:

let

the number of Fe2+ ions in the crystal be x

the number of Fe3+ ions in the crystal be y

total number of Fe2+ and Fe3+ ions is

x + y

given that x + y = 0.93

the total charge =0

 x (2+) + (0.93 –x) (+ 3) −2 = 0

2x + 2.97 −3x −2 = 0

x = 0.79

Percentage of Fe3+

= [ ( 0.93 −0.79) / (0.93) ] 100 = 15.05%


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Q.5
Potassium has a bcc structure with nearest neighbor distance 4.52 Aº . its atomic weight is 39. its density will be
A. 915 kg m-3 
B. 2142 kg m-3
C. 452 kg m-3
D. 390 kg m-3
Answer : Option A
Explaination / Solution:

ρ = n × M / a3NA

for bcc

n = 2

M=39

nearest distance 2r = 4.52



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Q.6
As per IUPAC guidelines, the name of the complex [Co( en)2 ( ONO)Cl ] Cl is
A. chlorobisethylenediaminenitritocobalt(III) chloride
B. chloridobis(ethane-1,2-diamine)nitro k-Ocobaltate(III) chloride
C. chloridobis(ethane-1,2-diammine)nitrito k -Ocobalt(II) chloride
D. chloridobis(ethane-1,2-diamine)nitro k -Ocobalt(III) chloride
Answer : Option D
Explaination / Solution:
No Explaination.


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Q.7
Which one of the following complexes is not expected to exhibit isomerism?
A. [Ni(NH3)4(H2O)2]2+
B. [Pt(NH3)2Cl2]
C. [Co(NH3)5SO4]Cl
D. [Fe(en)3]3+
Answer : Option D
Explaination / Solution:

Option (a) and (b) – geometrical isomerism is possible

Option (c) – ionization isomerism is possible

Option (d) – no possibility to show either constitutional isomerism or stereo isomerism


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Q.8
The magnetic moment of Mn2+ ion is
A. 5.92BM
B. 2.80BM
C. 8.95BM
D. 3.90BM
Answer : Option A
Explaination / Solution:

Mn2+ => 3d5 contains 5 unpaired electrons

n=5 ; … = √n(n+2) BM

= √[5(5+2)] = √35 = BM


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Q.9
MnO4- react with Br- in alkaline PH to give
A. BrO3 , MnO2
B. Br2 , MnO42−
C. Br2 , MnO2
D. BrO, MnO42−
Answer : Option A
Explaination / Solution:

2MnO4- + Br- + H2O → 2OH- + 2MnO2 + BrO3-

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Q.10
Which one of the following is not correct?
A. La(OH)3 is less basic than Lu(OH)3
B. In lanthanoid series ionic radius of Ln3+ ions decreases
C. La is actually an element of transition metal series rather than lanthanide series
D. Atomic radii of Zr and Hf are same because of lanthanide contraction
Answer : Option A
Explaination / Solution:
No Explaination.


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