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- Question
Which of the following is an element
Options- A. alumina
- B. brass
- C. graphite
- D. silicon
- Correct Answer
- silicon
- 1. PAS is a drug used in the treatment of
Options- A. tuberculosis
- B. Cancer
- C. typhoid
- D. malaria Discuss
- 2. 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
- 3. Which of the following is the lightest metal?
Options- A. Lithium
- B. Silver
- C. Mercury
- D. Lead Discuss
- 4. A substance that cannot be broken down into simpler substances
Options- A. Heterogenous mixure
- B. Compound
- C. Homogenous mixture
- D. Element Discuss
- 5. Which of the following elements has the lowest melting point?
Options- A. Bromine
- B. Zinc
- C. Lead
- D. Calcium Discuss
- 6. 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
- 7. Metal present in chocolate wrappers is
Options- A. Aluminium
- B. Haemoglobin
- C. Chalk
- D. Chlorophyll Discuss
- 8. Glass is a.........mixture of metallic...........
Options- A. homogenous, sulphates
- B. homogenous, silicates
- C. heterogenous, carbonates
- D. heterogenous, nitrates Discuss
- 9. Is boiling water a chemical change? Discuss
- 10. What are the two types of pure substances? Discuss
Chemistry problems
Search Results
Correct Answer: tuberculosis
Explanation:
Para-amino salicyclic acid (PAS) is used in the treatment of Tuberculosis.
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: Lithium
Correct Answer: Element
Explanation:
A 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).
Correct Answer: Bromine
Correct Answer: nuclear fission
Correct Answer: Aluminium
Correct Answer: homogenous, silicates
Correct Answer: No Boiling water is not a chemical change Because in this process it doesn't loss its properties It just changes its state ie, from liquid state to gaseous Hence, Boiling water is a Physiacl change and not a chemical change
Correct Answer: An atom is the smallest particle of a substance Chemical substances are divided into two major groups They are 1 Pure Substances (and) 2 Mixtures There are two types of pure substances that are Elements and Compounds Elements : An element is a substance that is made up of only one kind of atoms and cannot be broken down into simpler substances by chemical means Metals and Non- metals come under elements Examples of elements are Iron, Silver, Gold, Mercury etc Compounds : A Compound is a substance that is formed when two or more elements combine chemically Examples of compounds are Water, Carbon dioxide, methane, vinegar etc Mixtures : A Mixture is formed when two or more substances mixed together but not chemically combined Example: Air
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