ASSERTION : Isomorphous substances form crystals of same shape and can grow in saturated solution of each other. REASON : They have similar constitution and chemical formulae.
Correct!
Wrong!
ASSERTION : Zinc is obtained from the roasted or calcined ore (ZnO) by heating with calculated quantity of coal or coke in a reverberatory furnace, when C reduces the metal oxide to free metal. REASON : The process of extracting the metal by reduction of its oxide ore with carbon is called smelting.
Correct!
Wrong!
ASSERTION : Decreasing order of van der Walls’ radii is : Cl > N > O > H. REASON : van der Waals’ radii increase as the number of energy level increases and decrease as nuclear charge increases.
Correct!
Wrong!
ASSERTION : Geometry of SF4 molecule can be termed as distorted tetrahedron, a folded square or see-saw. REASON : Four fluorine atoms surround or form bond with sulphur molecule.
Correct!
Wrong!
ASSERTION : Sodium reacts with oxygen to form Na2O2 whereas potassium reacts with oxygen to form KO2. REASON : Potassium is more reactive than sodium.
Correct!
Wrong!
ASSERTION : The maximum and minimum oxidation number of sulphur are – 2 and +6 respectively. REASON : SO2 behaves both as an oxidising as well as reducing agent. However, SO3 can only as an oxidising agent.
Correct!
Wrong!
ASSERTION : There is a dip in the melting point of Mn in the first transition series. REASON : It has high enthalpy of atomization.
Correct!
Wrong!
ASSERTION : A nearly tetrahedral arrangement of the orbitals about the oxygen atom allows each water molecule to form hydrogen bonds with as many as four neighbouring water molecules. REASON : In ice each water molecule form four hydrogen bonds as each molecule is fixed in the space.
Correct!
Wrong!
ASSERTION : BF3 molecule has zero dipole moment. REASON : F is electronegative and B – F bonds are polar in nature.
Correct!
Wrong!
Chemistry quiz - Day3
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