Chemistry

1.Bring out the only correct statement in context with Uranium:

Both U-235 and U-238 are fissile but only U-235 can sustain chain reactions

Only U-235 is fissile and can sustain chain reaction but U-238 is fertile 

U-238 can be used in chain reactions only after extracting U-235 from it 

Uranium enrichment is a process where concentration of U-238 is increased using some chemical processes

2.“Atoms can neither be created nor destroyed.” This principle was given by __?

Avogadro Dalton Rutherford Niels Bohr

3.2,4-D, which is sold as a weed killer of the broad-leaved weeds is a synthetic version of __:

Auxin Hormone 

Cytokinin Hormone

Xylitol 

None of them

4.The aqueous solution of which among the following acids is called Vinegar?

Oxalic acid Citric acid Acetic acid Hydrochloric acid

5.Which among the following is the correct decreasing of bioelements in Human Body?

oxygen, hydrogen, Carbon, nitrogen, calcium, and phosphorus 

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