NTSE Chemistry Nature Of Matter MCQs

Question: Which of the following statements is/are correct?

• a) Intermolecular forces of attraction in solids are maximum.
• b) Intermolecular forces of attraction in gases are minimum
• c) Intermolecular spaces in solids are minimum
• d) All of the above

Answer: All of the above

Question: The smell of perfume spreads out by a process known as -

• a) Evaporation
• b) Diffusion
• c) Condensation
• d) Fusion

Answer: Diffusion

Question: Densities of gases change with-

• a) Temperature and volume
• b) Pressure only
• c) Temperature only
• d) Pressure and temperature

Answer: Pressure and temperature

Question: Carbogen is a mixture of -

• a) CO & CO2             
• b) CO & O2                
• c) CO2 & O2               
• d) CS2 & O2

Answer: CO2 & O2               

Question: Pair of substances undergoing sublimation is -

• a) Bromine and Iodine
• b) Dry Ice and Nausadar
• c) Sodium and Borax
• d) Naphthalene and Blue Vitriol

Answer: Dry Ice and Nausadar

Question: Dry ice is -

• a) Solid carbon - di - oxide
• b) Solid carbon monoxide
• c) Liquid carbon - di – oxide
• d) Liquid oxygen

Answer: Solid carbon - di - oxide

Question: Boiling point of 10% aqueous solution of common salt at atmospheric pressure is -

• a) 1000C   
• b) > 1000C           
• c) < 1000C    
• d) Not possible to predict

Answer: > 1000C            

Question: The change of state of substance from gas to liquid is called -

• a) Melting
• b) Boiling
• c) Condensation
• d) Vaporization

Answer: Condensation

Question: Which of the following conditions is most favorable for converting a gas into liquid ?

• a) High pressure, low temperature
• b) Low pressure, low temperature
• c) Low pressure, high temperature
• d) High pressure, high temperature

Answer: High pressure, low temperature

Question:

The boiling point of alcohol is 780C. What is this temperature is Kelvin scale ?          

• a) 373 K
• b) 351 K
• c) 341 K
• d) 78 K

Answer: 351 K

More Questions....................

Question: Boiling point of a substance -

• a) Decreases with decreasing the atmospheric pressure.
• b) Decreases with increasing the atmospheric pressure.
• c) Increases with decreasing the atmospheric pressure.
• d) Increases with increasing the atmospheric pressure.

Answer: Decreases with decreasing the atmospheric pressure.

Question: Which of the following statements is not correct ?

• a) A compound is a pure substance.
• b) A compound is homogeneous in nature.
• c) A compound always contains two or more elements.
• d) A compound can be separated into its constituent elements by some physical process.

Answer: A compound can be separated into its constituent elements by some physical process.

Question: If a substance can be separated into different kinds of matter by some physical process, then the substance is -

• a) an element
• b) a molecule
• c) a compound
• d) a mixture

Answer: a mixture

Question: An element is made up of only one kind of -

• a) Atoms
• b) Molecules
• c) Compounds
• d) All of these

Answer: Atoms

Question: What difference in the property of two miscible liquids enables their separation by fractional distillation ?

• a) Boiling point
• b) Melting point
• c) Viscosity
• d) Density

Answer: Boiling point

Question: The father of chemistry is -

• a) Priestley
• b) Lavoisier
• c) Dalton
• d) Mendeleeff

Answer: Lavoisier

Question: A pure substance can only be-

• a) A compound
• b) An element
• c) An element or a compound
• d) A heterogeneous mixture

Answer: An element or a compound

Question: Which one the following is not a compound ?

• a) Marble
• b) Ozone
• c) Carborundum
• d) Quicklime

Answer: Ozone

Question: Which one of the following is not an element ?

• a) Diamond
• b) Ozone
• c) Silica
• d) Graphite

Answer: Silica

Question: Which one of the following statements is incorrect ?

• a) All elements are homogeneous.
• b) Compounds always contain two or more different elements.
• c) A mixture is not always heterogeneous.
• d) Air is a heterogeneous mixture

Answer: Air is a heterogeneous mixture

Question: One sample of air is found to have 0.03% carbon dioxide and another sample 0.02%. This illustrates that -

• a) Air is a compound.
• b) Air is an element
• c) Air does not follow the law of constant proportions.
• d) Air is a mixture

Answer: Air is a mixture

Question: Which one of the following is not mixture ?

• a) Distilled water
• b) Sugar dissolved in water
• c) Liquefied petroleum
• d) Gasoline

Answer: Distilled water

Question: Which of the following is a characteristic property of both mixtures and compounds ?

• a) Their properties are same as those of their components.
• b) Energy is releases when they are formed.
• c) Their masses are equal to the sum of the masses of their components.
• d) They contain the components in fixed proportions.

Answer: Their masses are equal to the sum of the masses of their components.

Question: Which of the following processes is a physical change ?

• a) Sodium dissolves in water
• b) Iron rusts
• c) Iron is magnetized
• d) Magnesium wire is burnt

Answer: Iron is magnetized

Question: A method of obtaining oxygen, which illustrates a physical change and does not involve a chemical change is -

• a) Electrolysis of water
• b) Decomposition H2O2
• c) Heating potassium chlorate
• d) Distilling liquid air

Answer: Distilling liquid air

Question: Which one of the following is not chemical change ?

• a) Sublimation
• b) Combustion
• c) Electrolysis
• d) Rusting

Answer: Sublimation

Question: The change of state of substance from gas to liquid is called -

• a) Melting
• b) Boiling
• c) Condensation
• d) Vaporization

Answer: Condensation

Question: Which of the following conditions is most favorable for converting a gas into liquid ?

• a) High pressure, low temperature
• b) Low pressure, low temperature
• c) Low pressure, high temperature
• d) High pressure, high temperature

Answer: High pressure, low temperature

Question: The smell of perfume spreads out by a process known as -

• a) Evaporation
• b) Diffusion
• c) Condensation
• d) Fusion

Answer: Diffusion

Question: Densities of gases change with-

• a) Temperature and volume
• b) Pressure only
• c) Temperature only
• d) Pressure and temperature

Answer: Pressure and temperature