alleryWhich metal catalyses the hydrogenation of fats?
- Vanadium
- Nickel
- Zinc
- Silver
Show answer and solution
Correct answer: B. Nickel
Nickel catalysts allow hydrogen to add across the double bonds of oils to give fats.
NEET UG d- and f-Block Elements — practice questions — page 3
Explore 94 free d- and f-Block Elements questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 61–90 of 94.
Which metal catalyses the hydrogenation of fats?Read the answer and worked solution →Which silver compound is valued in photography for its light sensitivity?Read the answer and worked solution →Interstitial compounds form when which atoms are trapped in metal lattices?Read the answer and worked solution →Homogeneous alloys form readily when metallic radii differ by no more than about what?Read the answer and worked solution →In acidic solution, manganate(VI) disproportionates into which pair?Read the answer and worked solution →Why is K2Cr2O7 made by adding KCl to sodium dichromate solution?Read the answer and worked solution →Potassium dichromate is an important chemical in which industry?Read the answer and worked solution →Fusing MnO2 with KOH and an oxidant first gives which dark green product?Read the answer and worked solution →In the laboratory, a manganese(II) salt is oxidised to permanganate by which reagent?Read the answer and worked solution →Which is correct about manganate and permanganate ions?Read the answer and worked solution →How many electrons does one MnO4- ion gain when reduced to Mn2+ in acid?Read the answer and worked solution →Why are permanganate titrations unsatisfactory in hydrochloric acid?Read the answer and worked solution →Why does cerium readily form a +4 state?Read the answer and worked solution →Ce(IV) could oxidise water, yet it is a useful analytical reagent. Why?Read the answer and worked solution →Eu2+ readily changes to Eu3+. What role does Eu2+ therefore play?Read the answer and worked solution →Which lanthanoid ion has a half-filled 4f set and acts as an oxidant?Read the answer and worked solution →Which lanthanoid behaves like europium in showing both +2 and +3 states?Read the answer and worked solution →Which pair of trivalent lanthanoid-series ions is colourless?Read the answer and worked solution →With rising atomic number, lanthanoid chemistry shifts from calcium-like to resembling which metal?Read the answer and worked solution →Mischmetall is about 95 percent lanthanoid metal plus about 5 percent of which element?Read the answer and worked solution →Mixed lanthanoid oxides serve as catalysts in which process?Read the answer and worked solution →Why do 5f electrons take part in bonding more than 4f electrons?Read the answer and worked solution →How does actinoid contraction compare with lanthanoid?Read the answer and worked solution →Why do actinoids show a wider range of oxidation states than lanthanoids?Read the answer and worked solution →Which actinoid reaches a maximum oxidation state of +7?Read the answer and worked solution →Across the lanthanide series, the radius of the M3+ ion falls over roughly which range?Read the answer and worked solution →Why are zirconium and hafnium found together in nature and hard to separate?Read the answer and worked solution →The name transition metals first referred to properties transitional between which blocks?Read the answer and worked solution →Which ore is used to prepare potassium permanganate?Read the answer and worked solution →Which ore is fused with sodium carbonate to make sodium chromate?Read the answer and worked solution →
Worked practice questions
Which silver compound is valued in photography for its light sensitivity?
- Ag2S
- AgNO3
- Ag2O
- AgBr
Show answer and solution
Correct answer: D. AgBr
Silver bromide decomposes on exposure to light, which the photographic industry relies on.
Interstitial compounds form when which atoms are trapped in metal lattices?
- Large atoms like Cs, Ba
- Noble gas atoms like Ar
- Halogen atoms like I, Br
- Small atoms like H, C, N
Show answer and solution
Correct answer: D. Small atoms like H, C, N
Small atoms such as hydrogen, carbon or nitrogen fit into the holes of the metal crystal lattice.
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