Chemistry General Knowledge Questions

Chemistry Objective (Multiple Choice) General Knowledge Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examination

Bring out the only correct statement in context with Uranium:
[A]Both U-235 and U-238 are fissile but only U-235 can sustain chain reactions
[B]Only U-235 is fissile and can sustain chain reaction but U-238 is fertile
[C]U-238 can be used in chain reactions only after extracting U-235 from it
[D]Uranium enrichment is a process where concentration of U-238 is increased using some chemical processes

B is the correct answer.
C is not correct because U-238 will support chain reactions after it is converted to plutonium-239. D is also incorrect because its concentration of U-235 that matters.


“Atoms can neither be created nor destroyed.” This principle was given by __?
[D]Niels Bohr

The given principle is one of the postulates of the Dalton’s atomic theory given in 1803 by John Dalton. The postulates of Dalton’s atomic theory are as follows:
1. Elements consist of indivisible small particles (atoms).
2. All atoms of the same element are identical; different elements have different types of atom.
3. Atoms can neither be created nor destroyed.
4. ‘Compound elements’ (i.e. Compounds) are formed when atoms of different elements join in simple ratios to form ‘compound atoms’ (i.e. Molecules).


2,4-D, which is sold as a weed killer of the broad-leaved weeds is a synthetic version of __:
[A]Auxin Hormone
[B]Cytokinin Hormone
[D]None of them

Auxin Hormone
2,4-dichlorophenoxyacetic acid (2,4-dichlorophenoxyethanoic acid) is a synthetic auxin frequently used as a weed killer of broad-leaved weeds. When two herbicides 2,4,5-T and 2,4-D and mixed in equal parts, it is called Agent Orange, which was used by US in Vietnam war.


The aqueous solution of which among the following acids is called Vinegar?
[A]Oxalic acid
[B]Citric acid
[C]Acetic acid
[D]Hydrochloric acid

Acetic acid


Which among the following is the correct decreasing of bioelements in Human Body?
[A]oxygen, hydrogen, Carbon, nitrogen, calcium, and phosphorus
[B]oxygen, carbon, nitrogen, hydrogen, calcium, and phosphorus
[C]oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus
[D]carbon, oxygen, hydrogen, nitrogen, calcium, and phosphorus

oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus


Which among the following happens in an oxidation reaction ?
[A]Electrons are gained
[B]Electrons are lost
[C]Protons are gained
[D]Protons are lost

Electrons are lost


Identify the thermosetting plastic from the given options:



White Phosphorous is represented by which among the following symbols?

The most important form of elemental phosphorus from the perspective of applications and chemical literature is white phosphorus. It consists of tetrahedral P4 molecules, in which each atom is bound to the other three atoms by a single bond. This P4 tetrahedron is also present in liquid and gaseous phosphorus up to the temperature of 800 °C when it starts decomposing to P2 molecules.


Which among the following is called Laughing Gas popularly?
[A]Nitric oxide
[B]Nitrous oxide
[C]Nitrogen penta oxide

Nitrous oxide


Identify the non-metallic mineral from the given options: