Discussion
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- Question
A substance that cannot be broken down into simpler substances
Options- A. Heterogenous mixure
- B. Compound
- C. Homogenous mixture
- D. Element
- Correct Answer
- Element
ExplanationA substance that cannot be decomposed (broken down) into simpler substances by ordinary chemical means.
Examples: gold, iron, carbon, hydrogen, oxygen, nitrogen.
Material composed of only one kind of matter throughout (same atoms or same molecules).
- 1. Which of the following elements has the lowest melting point?
Options- A. Bromine
- B. Zinc
- C. Lead
- D. Calcium Discuss
- 2. What is the base of the Octal Numeral System?
Options- A. 8
- B. 16
- C. 32
- D. 64 Discuss
- 3. Adding which substance gives blue colour to glass?
Options- A. Manganese oxide
- B. Cobalt oxide
- C. Chromium oxide
- D. Iron oxide Discuss
- 4. Name the acid present in lemon.
Options- A. Phosphoric acid
- B. Carbonic acid
- C. Citric acid
- D. Malic acid Discuss
- 5. Which among the following compounds has the strongest hydrogen bond?
Options- A. HI
- B. HCl
- C. HF
- D. HBr Discuss
- 6. Which of the following is the lightest metal?
Options- A. Lithium
- B. Silver
- C. Mercury
- D. Lead Discuss
- 7. Water always contains hydrogen and oxygen in the ratio 1:8 by weight.This is in accordance with the
Options- A. Law of Multiple Proportions
- B. Law of Definite Proportion
- C. Law of Conservation of mass
- D. Law of Reciprocal Proportions Discuss
- 8. PAS is a drug used in the treatment of
Options- A. tuberculosis
- B. Cancer
- C. typhoid
- D. malaria Discuss
- 9. Which of the following is an element
Options- A. alumina
- B. brass
- C. graphite
- D. silicon Discuss
- 10. When the nucleus of Uranium is bombarded with neutrons, it breaks up into two nuclei of nearly equal mass. this process is called
Options- A. nuclear fission
- B. nuclear fusion
- C. physical change
- D. artificial radioactivity Discuss
Chemistry problems
Search Results
Correct Answer: Bromine
Correct Answer: 8
Correct Answer: Cobalt oxide
Correct Answer: Citric acid
Correct Answer: HF
Correct Answer: Lithium
Correct Answer: Law of Definite Proportion
Explanation:
The Law of Definite Proportion states that the same compound, wherever found or however made, always contains the same elements combined together in the same fixede ratio by weight.
Correct Answer: tuberculosis
Explanation:
Para-amino salicyclic acid (PAS) is used in the treatment of Tuberculosis.
Correct Answer: silicon
Correct Answer: nuclear fission
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