R4RIN – MCQs, Mock Tests | Chemistry Chemistry MCQ Questions Set-2

Which one is not metal

1. sulpher
2. sugar
3. nitogen
4. all of these

✅ Correct Answer: 4

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

✅ Correct Answer: 1

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

✅ Correct Answer: 2

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

✅ Correct Answer: 3

In known elements the maximum number is of

1. Metals
2. Non Metals
3. Metalloids
4. None of these

✅ Correct Answer: 1

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

✅ Correct Answer: 3

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

1. sodium
2. lead
3. zinc
4. mercury

✅ Correct Answer: 2

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

1. Hydrogen
2. Nitrogen
3. Argon
4. Helium

✅ Correct Answer: 1

In nuclear reactorChain reaction is controlled by introducing

1. cadmium rod
2. iron rod
3. platinum rod
4. graphite rod

✅ Correct Answer: 1

Natural Rubber is a Polymer of

1. butadiene
2. 2methyl-13butadiene
3. ethylene
4. isoprene

✅ Correct Answer: 4

Which one is the pure element

1. glass
2. cement
3. sodium
4. None of these

✅ Correct Answer: 3

he credit for the discovery of transuranic element goes to

1. Hahn
2. Rutherford
3. Seaborg
4. Curie

✅ Correct Answer: 3

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

✅ Correct Answer: 3

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

✅ Correct Answer: 1

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

1. 5
2. 10
3. 28
4. 140

✅ Correct Answer: 1

Which of the following is the strongest acid?

1. ClCH2COOH
2. BrCH2COOH
3. FCH2COOH
4. ICH2COOH

✅ Correct Answer: 3

Which Noble Gas has the highest First Ionization Energy?

1. Neon
2. Helium
3. Argon
4. Xenon

✅ Correct Answer: 2

The metal which reacts most violently with with cold water is

1. calcium
2. sodium
3. magnesium
4. potassium

✅ Correct Answer: 4

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

✅ Correct Answer: 1

Electromagnetic radiation with maximum wavelength is

1. ultraviolet
2. radio waves
3. x-rays
4. infrared

✅ Correct Answer: 2

What are long chains of Carbon Molecules called

1. Ribosomes
2. Hydrocarbons
3. Polymers
4. None

✅ Correct Answer: 3

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

1. Potassium Nitrate
2. Ammonium chloride
3. Calcium carbonate
4. Silver lodide

✅ Correct Answer: 4

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

✅ Correct Answer: 2

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

✅ Correct Answer: 2

Who is the father of modern chemistry?

1. Priestley
2. Lavoisier
3. Dalton
4. Mendeleeff

✅ Correct Answer: 2

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

✅ Correct Answer: 2

Which acid is produced when milk gets sour?

1. Lactic acid
2. Acetic acid
3. Tartaric acid
4. Butyric acid

✅ Correct Answer: 1

A pure substance can only be

1. Compound
2. an element
3. an element or a compound
4. a heterogeneous mixture

✅ Correct Answer: 3

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

✅ Correct Answer: 3

Most commonly used bleaching agent is

1. Chlorine
2. Alcohol
3. Carbon dioxide
4. Sodium Chloride

✅ Correct Answer: 3

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

✅ Correct Answer: 4

The freezing point of water at 760mm pressure is

1. 0 K
2. 273 K
3. 273 C
4. -273 C

✅ Correct Answer: 2

Orlon is a polymer of

1. Dacron
2. Acrylonitrile
3. Polyamide Nylon
4. None of the above

✅ Correct Answer: 2

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

1. Carbon disulphide
2. Chloroform
3. Carbon tetrachloride
4. Methyl ene chloride

✅ Correct Answer: 3

Li3PO4 compound name?

1. Lithium perchlorate
2. Lithium phyrite
3. Lithium phosphate
4. None

✅ Correct Answer: 3

An element which is preserved under water is

1. sodium
2. sulphur
3. red phosphorus
4. white phosphorus

✅ Correct Answer: 4

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

✅ Correct Answer: 3

The Most Abundant Rare Gas in the Atmosphere is

1. Xe
2. He
3. Ne
4. Ar

✅ Correct Answer: 4

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

✅ Correct Answer: 4

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)

✅ Correct Answer: 1

Which one of the following is a natural colloid ?

1. Cane sugar solution
2. Blood
3. Sodium chloride solution
4. Urea solution

✅ Correct Answer: 2

The law of constant proportions was enunciated by

1. Dalton
2. Berthelot
3. Avogadro
4. Proust

✅ Correct Answer: 4

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

✅ Correct Answer: 1

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

1. SO2
2. CH2Cl2
3. PCl3
4. All the above

✅ Correct Answer: 4

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

✅ Correct Answer: 1

The particle with 13 protons and 10 electrons is

1. Al -atom
2. Al3+ ion
3. nitrogen isotope
4. None of these

✅ Correct Answer: 2

Positive ions are formed from neutral atoms by loss of

1. neutrons
2. protons
3. nuclear charge
4. electrons

✅ Correct Answer: 4

What is the conjugate base of H2O?

1. NH3+
2. OH
3. H2O
4. All the above

✅ Correct Answer: 2

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

✅ Correct Answer: 2

What is the simplest form of matter?

1. Element
2. Molecule
3. Atom
4. Compound

✅ Correct Answer: 1