ajkpsc past papers lecturer of chemistry

ajkpsc past papers lecturer of chemistry

 

Plants look green due to absorption.

1. Green light
2. b) Red light
3. Black light
4. c) yellow light

Centre of diatribes is given by

1. Mean
2. Average
3. Modes
4. Standard derivation

Phases that is never gained in sublimation is

1. Celica
2. Glass
3. Leopard
4. Vapour

In universal indicators, red color show

1. Strong acid
2. Week acid
3. Strong alkaline
4. Week bases

Concentration change during the ration is given by:

1. Conductornetry
2. Colometry
3. Voltanerty
4. Polargraply

Locating agent of amino acid is :

1. Diazo reagent
2. Amphotatic oxide
3. Ninhydrin spray
4. Neutral oxide

NH4CL(S) + NaOH à

1. Na2CO3 + H2+NO2
2. NaCI + H2O + NH3
3. Na2CO3 + (H2O)5 + HCI
4. NaCI + HNO3

Which of the followings is different from the other three in            length?

1. 1 meter
2. 10^6 meter
3. 10^3 nanometre
4. 10^10 meter

 

Download ajkpsc past papers lecturer of chemistry mcqs

 

Which of the following is not commonly used as solvent tor infrared spectroscopy?

1. Ethanol
2. Carbon tetrachloride
3. Chloroform
4. Carbon disulphide

The R value is always in the range of:

1. -1 to 0
2. 1 to 2
3. 0 to 1
4. 1 to 14

According to the Boor Lambert LAW absorbance is independent of which of the following?

1. Distance that the light has travelled through the sample
2. Extinction coefficient of the sample
3. Solution concentration
4. Color of the solution

A shift to lower wave number for the absorption in a     spectrum corresponds to:

1. A shift to lower frequency
2. A shift to lower wave length
3. A loss of intensity
4. A shift of higher energy

An absorption in an electronic spectrum is record at      17000cm^-1. What does this correspond to in nm?

1. 5900 nm
2. 590 nm
3. 59 nm
4. 59000 nm

Components which have small value of K have affinity for

1. Mobile phase
2. No phase
3. Stationary phase
4. Solution

In gas chromatography, the basic for separation of the components of the volatile material is the difference in:

1. Partition coefficients
2. Molecular weight
3. Conductivity
4. Molarity

Which of the Following techniques does not involve electromagnetic vibration?

1. Infrared spectroscopy
2. NMR spectroscopy
3. MASS spectroscopy
4. All of these involve electromagnetic radiation

What is the wavelength range of the ordinary infrared region?

1. 8-2.5 µm
2. 16-1000 µm
3. 5-16 µm
4. 400-800 µm

Which of the following species Is detected In the mass     spectroscopy?

1. Positively charged species
2. Neutral molecules
3. Radical
4. More electronegative specie

Tito frequency of a transition is 5.4 * 10^15 Hz. What is the corresponding wavelength?

5. 6 * 10^-6 m
6. 560 nm
7. 6* 10^-8 m
8. 180 000 cm^-1

The frequency of a transition is 3.1*10^10 Hz. What is the energy of this transition?

2. 0*10^-23 kJ
3. 1*10^-44 KJ
4. 0*10^-23 J
5. 1*10^-44 J

Which of the Following atomic orbitals contains one nodal Plane

1. 3s
2. 3dz^2
3. 3py
4. 3dxy

The correct ordering of the electron negativities of the following atoms is:

1. N < O < H
2. O< N <H
3. H < O < N
4. H < N < O

SO2 belongs to which point group?

1. C2V
2. D-h
3. C2
4. C2

CO2 has:

1. 3 vibration mode
2. 4 vibration mode, 2 of which are degenerate
3. Stretching modes only
4. An IR active symmetric stretch

A molecule that cannot be superimpose on its mirror image is said to exhibit:

1. Geometric isomerism
2. Linkage isomerism
3. Optical isomerism
4. React Isomerism

The oxidation state of iron in k4 {Fe(CN)8} IS:

1. 1
2. 2
3. 3
4. 4

Atoms angular shape of ozone molecules (O2) consists of:

1. 2 sigma and 1 Pi bonds
2. 2 sigma and 2 Pi bonds
3. 1 sigma and 2 Pi bonds
4. 1 sigma and 2 Pi bonds

Atoms are the elements N and P have:

1. The same number of valance electron
2. The same number of proton
3. The same number of electron
4. The same number of neutron

Pick out the pair of species that are isoelectronic

1. SO2 and CO2
2. BF3 AND NF3
3. CO AND NO
4. CO2 AND (N3)

Which of the following has the most polar bond?

1. HF
2. HBR
3. HI
4. HCI

Which molecule does not have Tα symmetry?

1. SiF4
2. P4
3. CH4
4. XeF4

Which ligand is least likely to adopt a bridging mode between two metal centres?

1. CI
2. [CN]
3. PPh3
4. [MeCO2]

Which acid is thiosulfuric acid ?

1. H2S2O8
2. H2S2O7
3. H2S2O4
4. H2S2O3

Given the list of ligands and their corresponding names, choose the pair that disagree.

LIGAND              NAME

1. OH hydroxo
2. CN cyanide
3. CI chloro
4. H20 aqua

When EDTA solution is added to Mg lon solution then which of these following statement is not true

1. Four coordinate site of Mg2+ are occupied by EDTA and remaining the occupied by water molecules.
2. All six coordinate sites Mg2+ are occupied
3. PH of the solution is decreased
4. Coloriess [Mg-EDTA]-CHELATE FORMATE

Least paramagnetic property Is show by:

1. Fe
2. Mn
3. Ni
4. Cu

Iron exhibits 2+ and 3+ oxidation states which of the following statement about iron is incorrect?

1. Ferrous oxide is more basic in natural than the ferric oxide
2. Ferrous compound are relatively more iron than the corresponding ferric compound
3. Ferrous compounds are less volatile than the corresponding ferric compound
4. Ferrous compound are more easily hydrolyzed than the corresponding ferric compound

In its ground state, an H ion has:

1. Two spin-paired electronic
2. Two electronic in different orbitals
3. Two electron with paratel spins
4. One electron

The VESEPR model is consistent with one of the following molecules or ions being non-linear                 which is non-linear?

1. CO2
2. (CIF3)
3. [N3]
4. {I3}

Which ligand can coordinate in either a monodentato or cholating manner?

1. On
2. N3
3. Phen
4. THF

When the valence d orbitals of the central metal ion spilt is energy in an octahedral ilgand field, which orbitals are ralsed least in energy?

1. dxy and dx2y2
2. dxz and dyz
3. Dxy1 dxz and dyz
4. dxz2 dyz and dz2

In which one of the following species does the transition metal ion have d3 electronic configuration?

1. Cr (NH3)6}20
2. {COF4}4
3. {Cu (OH2)8}30
4. {Fe (CN)5}2

Which has maximum paramagnetic character?

1. [Fe (CN)6]2
2. [Cu(NH2)4]2+
3. Cu(H2O)4]2+
4. [Mn (H2O)6]2+

TMS is used as internal standard in

1. FTIR
2. VU
3. Raman spectroscopy
4. H-NMR

Carbonyl compounds have an order to

1. Blue cheese
2. Almonds
3. Fruits
4. Grapes

An amphoteric compound is that which contains

1. Acidic function group
2. Basic function group
3. Acidic and basic function group
4. Neutral function group

Pentane and 2-methly butane have the same

1. Boiling point
2. Melting point
3. Percentage composition
4. Structural formula

Geometric isomerism is usually found in

1. Alkanes
2. Alkenes
3. Alkyne
4. Estoes

One important aspect when choosing a solvent system for extraction to pick two:

1. Irremissible solvents
2. Miscible solvents
3. High density solvents
4. Low density solvents

What is the relationship between trans-2-butene and cis-2-butane:

1. Unrelated compounds
2. Constitutional isomers Geometric isomers
3. Enantiomers
4. Diastereomer

A single atom or a group of atoms which gives characteristics properties to a compound is called:

1. Radical
2. Hydrocarbon
3. Functional group
4. Ion

2-Propanol and 1-Propanol show the isomerism:

1. Metamerism
2. Geometric isomerism
3. Functional group isomerism
4. Position isomerism

Functional groups information of compound under investigation is obtained:

1. Mass Spectrometry
2. FTIR
3. H-NMR
4. UV

A plane of symmetry is a plane passing through an object such that the part of one side of the plane is exact reflection of part on the other side. This plane of symmetry also called:

1. Alternating Axis of symmetry
2. Mirror plane
3. Centre of symmetry
4. Centre of axis

Absorption of what type of electromagnetic radiation results in electronic transition?

1. Microwaves
2. X-rays
3. Radio waves
4. Ultraviolet light

Ethanol can be oxidized stepwise, What is the first stable intermediate used when ethanol is oxidized with a mild oxidation agent?

1. CH₂COOH
2. CO₂
3. CH₂ CHO
4. CH₃ CH₂ OH

Which of the following hydrocarbons does not have isomers?

1. C₂H₁₆
2. C₂H₁₄
3. C₂H₁₅
4. C₂H₈

All nucleophiles are

1. Lewis acids
2. Lewis bases
3. Bronsted bases
4. Bronsted acids

What is the correct name for this molecule?

1. (2R, 3R)-2-bromo-3-chlorobutance
2. (2R, 3R)-2-bromo-3-chlorobutance
3. (2S, 3S)-2-bromo-3-chlorobutance
4. (2R, 3S)-2-bromo-3-chlorobutance

Rank the following actions in order form most stable to least stable?

1. 1>2>3>4
2. 4>3>2>1
3. 2>1>4>3
4. 3>4>2>1

Which of the following is the best reagent to promote an S_H2 reaction?

1. Tert-BuONa/tert-BuO
2. Terr-BuOH/H₂O
3. EtONa/EtOH
4. EtOH/

Bromine water does not react with benzene at

1. High temperature
2. Room temperature
3. Low temperature
4. Constant temperature

The elimination in which both groups are lost from the same carbon atom to give carbine is called

1. Elimination
2. Elimination
3. Elimination
4. Elimination

Explain why the two stereolsorms of 1,4-dimethylcyclohexane are archival

1. Because they are identical
2. Because they are enantiomers
3. Because they both have the same absolute configuration
4. Because they are no stereocenters present in either molecule

Which of the following condition is necessary for a reaction to be spontaneous?

1. ΔS > 0
2. ΔS + ΔS   >0
3. ΔS > 0
4. ΔS + ΔS   <0

For a spontaneous change in a system at constant temperature and pressure, which of the following element is true?

1. ΔG < 0
2. ΔG = 0
3. ΔG > 0
4. There is no restriction on the value of ΔG

The amount of heat required to raise  the temperature of the unit mass of gas through one degree at constant volume, is called

1. Specific heat at constant volume
2. kilo joule
3. Specific heat at constant pressure
4. heat capacity

An adiabatic process is one in which:

1. No heat enters or leaves the gas
2. The temperature of the gas changes
3. The change in internal energy is equal to the mechanical work done
4. All of the above

The entropy                    in an irreversible cyclic process.

1. Remains constant
2. Increases
3. Decreases
4. Remains zero

The measurement of a thermodynamic property known as temperature is based on

1. Zeroth law of thermodynamics
2. Second law of thermodynamics
3. First law of thermodynamics
4. None of these

Work done in a free expansion process is:

1. Maximum
2. Positive
3. Zero
4. Minimum

Which of the following requires a corpuscular interpretation of light?

1. Refraction
2. photoelectric effect
3. Interference
4. Bragg’s diffraction law

The phenomena of lowering of vapor pressure is defined as:

1. Decrease in vapor pressure of a solvent on addition of a volatile non electrolyte solute in it.
2. Decrease in vapor pressure of a solvent on addition of a non-volatile non electrolyte solute it.
3. Decrease in vapor pressure of a solvent addition of a volatile electrolyte solute in it.
4. Decrease in vapor pressure of a solvent on addition of a non-volatile solute in it.

In case of radiations, amount of energy is proportional to:

1. Frequency of radiation
2. Waves
3. Density of radiation
4. Light

A photoelectron has a kinetic energy of 3.588 *10-19J. What is speed?

443. 7*103ms-1
444. 220*109ms-1
445. 9*103ms-1
446. 79*103ms-1

What is the degeneracy of the energy of the energy level with n = 6 in a hydrogen atom or ion?

1. 25
2. 16
3. 36
4. 19

In determining kinetic equation of gases, the velocity of all molecules is not equal. So, we use:

1. Square of velocity
2. Under root of velocity
3. Mean square velocity
4. Cube of Velocity

Molar concentrate of a solution is

1. Equal to the molality of solution
2. less than the molality of solution
3. More than the molality of solution
4. Always equal to normality of solution

A homogeneous mixture of a pair of benzene and toluene represents

1. Variable deviation from Raoul’s law
2. Positive deviation from Raoul’s law
3. A very small deviation from Raoul’s law
4. Negative deviation from Raoul’s law

Which of the following statement about the order of the reaction is true:

1. The order of the reaction can only be determined by experiment
2. A second order reaction is also bimolecular
3. The order of reaction must be positive integer
4. The order of reaction increase with increasing temperature

Half life period of second order reaction is:

1. Inversely proportional to square of initial concentration of the reactants
2. Independent of initial Concentration of reactants
3. Proportional to initial concentration of the reactants
4. Inversely proportional to Initial concentration of reactants

According to the collision theory of reaction rates:

1. All the reaction which occur in gaseous phase are zero order reactions
2. Every collision between reactants lead to a chemical reaction
3. Rate of reaction is proportional to velocity of molecules
4. Rate of reaction is proportional so number of effective collision per second

The outermost electronic configuration of the most electronegative element is

1. ns2 ,  np3
2. ns2 , np4
3. ns2, np3

What is the root mean square speed of Methane CH4 molecules in a simple of at 25 *C

6. 24 m s-1
7. 2 ms_1
8. 5 ms-1
9. 681 ms-1

The Miller Indices are often used in the area of

1. Polymer structure
2. Molecular spectrum
3. Single crystal
4. Surface chemistry

The mass of a unit cell of CsCl corresponds to

1. 1Cs* and 1Cl-
2. 1Cs* and 6Cl-
3. 8Cs+ and 1Cl-
4. 4Cs-and 4Cl-

The photon of visible region could not show the comption effect because they

1. Have to small masses
2. Have no momentum
3. Travel to Slowly
4. Have large wavelength

The osmotic pressure of a solution can be measured by:

1. Pfeiffer method
2. briefly and Hartley method
3. mosses and Frazer method
4. All of the above

When the vapour pressure of the solution of two liquid are less than those of expected from Ideal solution they are said to have

1. Positive diversions for low concentrations and negative diversion for higher concentration
2. Positive divergence from Ideal behaviour
3. Negative diversion from Ideal behaviour
4. None

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