R4RIN – MCQs, Mock Tests | Chemistry Chemistry MCQ Questions Se-9

Stoichiometry is based on

1. Law of conservation of energy
2. Law of conservation of mass
3. Newton's 1st law
4. Kepler's law

✅ Correct Answer: 2

The chemical name of common salt is

1. Calcium Chloride
2. Potassium Chloride
3. Sodium Chloride
4. Magnesium Chloride

✅ Correct Answer: 3

The element present in all organic molecules is

1. Hydrogen
2. Oxygen
3. Carbon
4. None of the above

✅ Correct Answer: 3

Brownish film formed on iron when left in open is called?

1. Dust
2. Shovel
3. Spade
4. Rust

✅ Correct Answer: 4

The mass of a mole of NaCl is the

1. 58.44 gm/mol
2. 57.25 gm/mol
3. 56.31 gm/mol
4. 59.14 gm/mol

✅ Correct Answer: 1

Why is argon gas used along with tungsten wire in an electric bulb?

1. To increase the life of the bulb
2. To reduce the consumption of electricity
3. To make the emitted light colored
4. To reduce the cost of the bulb

✅ Correct Answer: 1

Which one of the following elements is used as a timekeeper in atomic clocks?

1. Potassium
2. Caesium
3. Calcium
4. Magnesium

✅ Correct Answer: 2

Metals that are liquid at room temperature?

1. Caesium
2. Gallium
3. Rubidium
4. Mercury

✅ Correct Answer: 4

Which of the statement(s) about the reaction given below is/are INCORRECT? 2PbO (s) + C (s) ? 2Pb (s) + CO2 (g) I. Lead is getting reduced. II. Carbon is getting reduced. III. Lead oxide is getting reduced.

1. Only I and II
2. Only I and III
3. Only II and III
4. All I, II and III

✅ Correct Answer: 1

German Silver contains

1. 100% pure silver
2. 10% silver
3. 1% silver
4. 0% silver

✅ Correct Answer: 4

When a chemical bond is broken energy is

1. transferred
2. released
3. used
4. None of the above

✅ Correct Answer: 3

Liquid sodium is being considered as

1. engine coolant
2. bleaching agent
3. antiseptic
4. None of the above

✅ Correct Answer: 1

Brown stains in vessels and clothes indicate the presence of high quantities of ________ in water

1. Magnesium
2. Calcium
3. Manganese
4. Chromium

✅ Correct Answer: 3

Which has the lowest freezing point?

1. Mercury
2. Helium
3. Cesium
4. Aluminium

✅ Correct Answer: 2

What element is used to disinfect swimming pools?

1. Fluorine
2. Chlorine
3. Bromine
4. Sulphur

✅ Correct Answer: 2

Which is not a green house gas in the following?

1. Ozone
2. Nitrous oxide
3. Water vapour
4. Hydrogen

✅ Correct Answer: 4

Uranium found in Ladakh is an example of which type of resource?

1. unnatural resources
2. Actual resources
3. Potential resources
4. Biotic resources

✅ Correct Answer: 3

Which type of bond is found in sodium bromide?

1. Ionic
2. Covalent
3. Polar covalent
4. None of the above

✅ Correct Answer: 1

An atom that loses or gains electrons is called

1. Proton
2. Ion
3. Isotope
4. Neutron

✅ Correct Answer: 2

Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?

1. Element with 18 neutrons and 20 protons
2. Element with 19 neutrons and 18 protons
3. Element with 19 neutrons and 20 protons
4. Element with 18 neutrons and 22 neutrons

✅ Correct Answer: 4

Which one of the following elements is essential for the formation of chlorophyll in green plants?

1. Calcium
2. Iron
3. Magnesium
4. Potassium

✅ Correct Answer: 3

Which one of the following is a physical change?

1. Burning of coal
2. Burning of wood
3. Heating of a platinum crucible
4. Heating of potassium chlorate

✅ Correct Answer: 3

Isotopes are atoms of the same element that have different

1. mass numbers
2. atomic numbers
3. protons
4. All of the above

✅ Correct Answer: 1

Atoms have no electric charge because they

1. have same number of electrons and neutrons
2. have same number of electrons and protons
3. have same number of protons and neutrons
4. have same number of protons, electrons and neutrons

✅ Correct Answer: 2

Tertiary sewage treatment is designed to remove

1. Calcium and Phosphorous
2. Nitrogen and Calcium
3. Phosphorous and Nitrogen
4. Calcium and Nitrogen

✅ Correct Answer: 3

The chemical name of common salt is

1. Sodium Chloride
2. Potassium Nitrate
3. Sodium Nitrate
4. Potassium Chloride

✅ Correct Answer: 1

Which molecule is nonpolar and has a symmetrical shape?

1. NH3
2. HCl
3. H2O
4. CH4

✅ Correct Answer: 4

An electron loses potential energy when it

1. shifts to a more electronegative atom.
2. increases its kinetic energy.
3. shifts to a less electronegative atom.
4. increases its activity as an oxidizing agent.

✅ Correct Answer: 1

Which are two chemicals used to purify water?

1. Chlorine & Fluorine
2. Fluorine & Iodine
3. Chlorine & Hydrogen peroxide
4. Fluorine & Iodine

✅ Correct Answer: 3

Which of the following is NOT a waste material removed from blood in the kidney?

1. Ammonia
2. Carbon dioxide
3. Urea
4. Uric acid

✅ Correct Answer: 2

The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its ___________.

1. Crystallisation
2. Crystallisation
3. Evaporation
4. Evaporation

✅ Correct Answer: 2

Which one of the following statements is not correct?

1. The cathode rays originate from cathode and proceed towards the anode in a cathode-ray discharge tube.
2. The television picture tubes are nothing but cathode ray tubes.
3. The cathode rays themselves are not visible.
4. The characteristics of cathode rays depend upon the nature of the gas present in the cathode-ray tube.

✅ Correct Answer: 4

Which properties are characteristic of the group 1 metals?

1. Low melting points
2. Produce hydrogen when react with water
3. Soft in nature
4. All of the above

✅ Correct Answer: 4

Which compound is an electrolyte?

1. HCl
2. NaCl
3. HBr
4. All of the above

✅ Correct Answer: 4

Which equation is an example of a synthesis reaction?

1. 2H2 + O2 ? 2H2O
2. Na + Cl ? NaCl
3. HA + BOH ? H2O + BA
4. NaCl + AgNO3 ? NaNO3 + AgCl

✅ Correct Answer: 2

______ gets converted to phosgene, when exposed to sunlight.

1. Chloroform
2. Acetone
3. Benzene
4. Propylene

✅ Correct Answer: 1

Arrange the following compounds in order of increasing acidity?

1. o-cresol < phenol < o-nitrophtenol
2. phenol < o-nitrophtenol < o-cresol
3. o-nitrophtenol < o-cresol < phenol
4. None of the above

✅ Correct Answer: 1

The number of electron levels in a magnesium atom is

1. 3
2. 2
3. 1
4. 0

✅ Correct Answer: 3

Which base is present in soap?

1. Sodium hydroxide
2. Silicon dioxide
3. Calcium hydroxide
4. Ammonium hydroxide

✅ Correct Answer: 1

Constantan is an alloy of copper and _______.

1. aluminium
2. tin
3. nickel
4. iron

✅ Correct Answer: 3

An element with an atomic number of ___ will form a basic oxide.

1. 20
2. 7
3. 6
4. 17

✅ Correct Answer: 1

Which among the following is false about alpha particles?

1. They have high ionizing power
2. They have high penetrating power
3. They have high kinetic energy
4. They are positively charged helium nuclei

✅ Correct Answer: 2

Process of gaining electrons is known as _____.

1. oxidation
2. reduction
3. radiation
4. both oxidation and reduction

✅ Correct Answer: 2

What types of atoms form covalent bonds?

1. metal and metal
2. metal and non metal
3. non metal and non metal
4. All of the above

✅ Correct Answer: 3

Infiltration is the process by which rainwater becomes

1. river water
2. ground water
3. salt water
4. ocean water

✅ Correct Answer: 2

Name the densest stable element known on earth.

1. Osmium
2. Rhodium
3. Aluminium
4. Tungsten

✅ Correct Answer: 1

Which scientist established the Law of Octaves?

1. John Newlands
2. Antoine Lavoisier
3. Alfred Nobel
4. Marie Curie

✅ Correct Answer: 1

Which of the following is NOT a nucleon?

1. Proton
2. Electron
3. Neutron
4. No option is correct

✅ Correct Answer: 2