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- dimorphism
- isomorphism
- isomerism
- allotropy
Sciences MCQs
The phenomenon in which a chemical reaction is accelerated or retarded by the mere presence of a substance which remains unchanged at the end of the reaction is called _____.
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- catabolism
- cataclysm
- catalysis
- cataphoresis
Which of the following statements is true about reduction?
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- Process involving addition of Oxygen
- Process involving removal of electronegative radical
- Process involving addition of electropositive radical
- Process involving addition of hydrogen
The conversion of a solid directly into vapour and its subsequent condensation without melting is called _____.
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- deliquescence
- evaporation
- desiccation
- sublimation
Atoms of an element having the same atomic number but different atomic weights are called _____.
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- cathode
- iron
- laser
- isotopes
Pyrolusite is the _____.
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- ore of copper
- ore of lead
- ore of manganese
- ore of potassium
The atomic state of an element as a result of chemical reaction in which it is more active than in ordinary molecular state is called _____.
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- critical state
- nacent state
- nuclear state
- neutral state
A property of some substances of absorbing moisture from the air on exposure is called _____.
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- desiccation
- dimorphism
- efflorescence
- deliquescence
The substance which acts both as a base and as an acid under different circumstances is called _____.
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- amorphous
- halogen
- amphoteric
- cation
A mixture of concentrated nitric and hydrochloric acids in the ration 1:3 is called _____.
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- aquasol
- aqua regia
- aqua fortis
- aqua culture