41. | blue is kinda |
A. Copper sulphate | |
B. calcium sulfate | |
C. iron sulfate | |
D. sodium sulfate |
42. | Which chemical is used to kill algae in water tanks? |
A. Copper sulphate | |
B. magnesium sulfate | |
C. zinc sulfate | |
D. nitric acid |
43. | From which ore is zinc metal mainly extracted? |
A. zinc blade | |
B. calamine | |
C. zincite | |
D. Belemite |
44. | Jawar Mines located in Rajasthan are famous for which mineral? |
A. Copper | |
B. Iron | |
C. mica | |
D. such as |
45. | The coating of which of the following on metals is called ‘Galvanizing’ |
A. such as | |
B. Copper | |
C. cadmium | |
D. tin |
46. | What is the coating of zinc on water pipes made of iron to protect them from rust called? |
A. zinc plating | |
B. alloying | |
C. vulcanization | |
D. rendition |
47. | The disease of paddy is due to the deficiency of which element? |
A. nitrogen | |
B. such as | |
C. calcium | |
D. magnesium |
48. | Which of the following is a metal |
A. chlorine | |
B. Zinc | |
C. Neon | |
D. iodine |
49. | What is philosopher’s wool? |
A. ZnO | |
B. ZnCO₃ | |
C. ZnS | |
D. ZnSO₄ |
50. | White Vitriol is – |
A. CuSO₄-5H₂O | |
B. ZnSO₄-7H₂O | |
C. FeSO₄-7H₂O | |
D. MgSO₄-7H₂O |