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Which one of the following statements is...

Which one of the following statements is correct ?

A

All elements are heterogenous in nature

B

Compounds made up of a number of elements are heterogenous

C

A mixture is always heterogenous

D

Air is a homogenous mixture

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The correct Answer is:
D
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AAKASH INSTITUTE-SOME BASIC CONCEPTS OF CHEMISTRY -ASSIGNMENT SECTION A (Objective Type Questions (One option is correct))
  1. The prefix atto stands for

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  2. Which one of the following is not an element ?

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  3. Which one of the following statements is correct ?

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  4. Which one of the following statements is false ?

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  5. A balanced chemical equation is in accordance with

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  6. When pentane , C(5) H(12) is burned in excess oxygen , the products of...

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  7. Which one of the following best explains the law of conservation of ma...

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  8. The percentage of hydrogen in water and hydrogen peroxide is 11 .1 and...

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  9. Element X forms five stable oxides with oxygen of formula X(2) O, XO ,...

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  10. Which of the following represents Avogadro's hypothesis ?

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  11. Two oxides of a metal contain 27.6% and 30.0% of Oxygen, respecttively...

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  12. Which of the following is not a physical quantity of measurement ?

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  13. Physical properties can be measured

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  14. When 200 g of lime strongly heated , it undergoes thermal decompositio...

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  15. Carbon and oxygen react in ratio 3 : 8 by mass to form CO(2) . What we...

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  16. Molecular mass of C(3) H(7) OH is

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  17. If an atom of an element has twice the mass of C-12 , then its atomic ...

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  18. Formula unit mass of K(2) CO(3) is (Atomic mass of K = 39 u , C = 1...

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  19. The number of moles of nitrogen atom in 56 g nitrogen is

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  20. The number of mole of N - atom in 18.066 x 10 ^(23) nitrogen atoms is

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