Chemistry-Chemistry MCQ Questions Set/2 Sample Test,Sample questions

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Question: 
A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm the other is at :

1. 518 nm

2.1035 nm

3.325 nm

4.743 nm

Question: 
A pure substance can only be

1.Compound

2.an element

3.an element or a compound

4. a heterogeneous mixture

Question: 
A radioactive substance has a half life of four months three-fourth of the substance would decay in

1.3 months

2.4 months

3.8 months

4.12 months

Question: 
An atom has 7 electrons in its M - shell and contains 18 neutrons in its nucleus. What is its mass number

1.25

2.27

3.35

4.43

Question: 
An element which is preserved under water is

1.sodium

2.sulphur

3. red phosphorus

4.white phosphorus

Question: 
Electromagnetic radiation with maximum wavelength is

1.ultraviolet

2.radio waves

3.x-rays

4.infrared

Question: 
Ethanol is converted into ethoxy ethane

1.by heating excess of ethanol with conc. H2SO4 at 140 C

2.by treating with conc. H2SO4 at room temperature

3. by treating with conc. H2SO4 at 273 K

4.by heating Ethanol with excess of conc. H2SO4 at 443 K

Question: 
Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at –6 C will be: (Kf  for

1.204.60 g

2.304.30 g

3.804.32 g

4.400.00 g

Question: 
he credit for the discovery of transuranic element goes to

1.Hahn

2.Rutherford

3.Seaborg

4.Curie

Question: 
Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to

1.dehydration

2.oxidation

3.reduction

4.dehydrogenation

Question: 
How many moles are there in 140g of Si (atomic mass of silicon is 28)

1.5

2.10

3.28

4.140

Question: 
In a face centred cubic lattice atom A occupies the corner positions and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points the formula of the compound is

1) A2B5
2) A3B2
3) A2B3
4) A3B4

1.Option 1

2.Option 2

3.Option 3

4.Option 4

Question: 
In known elements the maximum number is of

1.Metals

2.Non Metals

3.Metalloids

4. None of these

Question: 
In nuclear reactorChain reaction is controlled by introducing

1.cadmium rod

2.iron rod

3.platinum rod

4. graphite rod

Question: 
Li3PO4 compound name?

1.Lithium perchlorate

2.Lithium phyrite

3.Lithium phosphate

4.None

Question: 
Most commonly used bleaching agent is

1.Chlorine

2.Alcohol

3.Carbon dioxide

4. Sodium Chloride

Question: 
Natural Rubber is a Polymer of

1.butadiene

2.2methyl-13butadiene

3.ethylene

4.isoprene

Question: 
Orlon is a polymer of

1.Dacron

2.Acrylonitrile

3.Polyamide Nylon

4.None of the above

Question: 
Positive ions are formed from neutral atoms by loss of

1.neutrons

2.protons

3.nuclear charge

4.electrons

Question: 
The bleeding of a wound is stopped by the application of ferric chloride because_____

1.Ferric chloride seals the blood vessels

2.Blood starts flowing in the opposite direction

3.Blood reacts and a solid is formed which seals the blood vessels

4.Blood is coagulated and the blood vessels are sealed

Question: 
The difference between a nuclear reactor and atomic bomb is that ___________

1. no chain reaction takes place in nuclear reactor while in the atomic bomb there is a chain reaction

2.the chain reaction in nuclear reactor is controlled

3.the chain reaction in nuclear reactor is not controlled

4.no-chain reaction takes place in atomic bomb while it takes place in nuclear reactor

Question: 
The freezing point of water at 760mm pressure is

1.0 K

2.273 K

3.273 C

4. -273 C

Question: 
The fundamental particles present in equal numbers in neutral atoms are

1.protons and electrons

2.neutrons and electrons

3.protons and neutrons

4.protons and positrons

Question: 
The isotopes of chlorine with mass number 35 and 37 exist in the ratio of

1. 1:2

2.2:03

3.3:01

4.3:04

Question: 
The law of constant proportions was enunciated by

1.Dalton

2.Berthelot

3.Avogadro

4.Proust

Question: 
The metal which reacts most violently with with cold water is

1.calcium

2.sodium

3.magnesium

4.potassium

Question: 
The Most Abundant Rare Gas in the Atmosphere is

1.Xe

2.He

3.Ne

4.Ar

Question: 
The nitrogen atom has 7 protons and 7 electronsThe nitride ion will have

1.10 protons and 7 electrons

2. 7 protons and 10 electrons

3.4 protons and 7 electrons

4.4 protons and 10 electrons

Question: 
The particle with 13 protons and 10 electrons is

1.Al -atom

2. Al3+ ion

3.nitrogen isotope

4.None of these

Question: 
The presence or absence of hydroxy group on which carbon atom of sugar differentiates RNA and DNA ?

1.4th

2.2nd

3.3rd

4.1st

Question: 
What are long chains of Carbon Molecules called

1.Ribosomes

2.Hydrocarbons

3.Polymers

4.None

Question: 
What is the conjugate base of H2O?

1.NH3+

2.OH

3.H2O

4.All the above

Question: 
What is the IUPAC name of [Co(NH3)4Cl2]?

1.Tetra-ammine dichloro cobalt (III) chloride

2.Tetra-ammine trichloro cobalt (III)

3. Tri-ammine dichloro cobalt (III) chloride

4.Tetra-ammine dichloro cobalt

Question: 
What is the simplest form of matter?

1.Element

2.Molecule

3.Atom

4.Compound

Question: 
Which acid is produced when milk gets sour?

1.Lactic acid

2.Acetic acid

3.Tartaric acid

4.Butyric acid

Question: 
Which combination of atoms can form a polar covalent bond?

1. H and Br

2.H and H

3.Na and Br

4.N and N

Question: 
Which is the gas used for making vegetables and vanaspathi from vegetable oils?

1.Hydrogen

2.Nitrogen

3.Argon

4.Helium

Question: 
Which Noble Gas has the highest First Ionization Energy?

1.Neon

2.Helium

3.Argon

4.Xenon

Question: 
Which of the following carbon compounds is used as a fire- extinguisher?

1.Carbon disulphide

2.Chloroform

3.Carbon tetrachloride

4.Methyl ene chloride

Question: 
Which of the following is the strongest acid?

1.ClCH2COOH

2.BrCH2COOH

3.FCH2COOH

4.ICH2COOH

Question: 
Which of these molecules are polar? Check all that apply.

1.SO2

2.CH2Cl2

3.PCl3

4.All the above

Question: 
Which one among the following is the heaviest

1.1 mole of water molecules

2.1 mole of ammonia molecules

3.1 mole of sodium atoms

4. 1 mole of hydrogen molecules

Question: 
Which one is not metal

1.sulpher

2.sugar

3.nitogen

4.all of these

Question: 
Which one is the pure element

1.glass

2.cement

3.sodium

4.None of these

Question: 
Which one of the following can be used to confirm wether drinking water contains a gamma emitting isotope or not

1.Microscope

2.Scintillation counter

3.Lead plate

4.pectrophotometer

Question: 
Which one of the following elements is the poorest conductor of heat

1.sodium

2.lead

3.zinc

4.mercury

Question: 
Which one of the following is a natural colloid ?

1.Cane sugar solution

2.Blood

3.Sodium chloride solution

4.Urea solution

Question: 
Which one of the following is used to induce artificial rain ?

1.Potassium Nitrate

2.Ammonium chloride

3.Calcium carbonate

4. Silver lodide

Question: 
Which solution has the highest pH?

1.50.0 mL 0.0500 M calcium hydroxide Ca(OH)2 (aq)

2.50.0 mL 0.0500 M sodium hydroxide NaOH (aq)

3.50.0 mL 0.0500 M nitric acid HNO3 (aq)

4.50.0 mL 0.0500 M nitrous acid HNO2 (aq)

Question: 
Who is the father of modern chemistry?

1.Priestley

2.Lavoisier

3.Dalton

4.Mendeleeff

Posted on by Online Exam TestTeam

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