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2mL each of concentrated HCl, HNO3 and a...

2mL each of concentrated HCl, `HNO_3` and a mixture of concentrated HCl and concentrated `HNO_3` in the ratio of 3:1 were taken in test tubes labelled as A,B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolced in test tube C respectively. the metal could be

A

Al

B

Au

C

Cu

D

Pt

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MODERN PUBLICATION-METALS AND NON-METALS-EXERCISE
  1. Generally non-metals are not lustrous. Which of the following non-meta...

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  2. Which one of the following four metals would be displaced from the sol...

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  3. 2mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl a...

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  4. An alloy is

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  5. An electrolytic cell consists of positively charged cathode, negativel...

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  6. During electrolytic refining of zinc, it gets

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  7. Which of the following metal can be cut with a knife?

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  8. Which among the following alloys contain mercury as one of its constit...

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  9. Which among the following statements is incorrect for magnesium metal?

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  10. Which among the following alloys contain mercury as one of its constit...

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  11. Reaction between X and Y forms compound Z. X loses electron and Y gain...

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  12. The electronic configurations of three elements X,Y and Z are X-2,8, Y...

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  13. Although metals from basic oxides, which of the following metals form ...

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  14. Generally non metals are not conductors of electricity. Which of the f...

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  15. Electrical wires have a coating of an insulating material. The materia...

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  16. Which of the following non-metals is a liquid?

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  17. Which of the following can undergo a chemical reaction?

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  18. Which one of the following is correctly paired?

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  19. The most malleable metal is

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  20. Cinnabar is an ore of

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