Chemistry problems
- 1. Washing soda is
Options- A. sodium hydroxide
- B. sodium carbonate
- C. sodium bicorbonate
- D. Potassium chloride Also asked in: AIEEE
Correct Answer: sodium carbonate
Explanation:
Sodium hydroxide - NaOH is caustic soda
Sodium carbonate - Na2CO3 is washing soda
Sodium bicarbonate - NaHCO3 is baking soda
- 2. In the making of jewels, gold is usually mixed with
Options- A. zinc
- B. tin
- C. copper
- D. aluminium Discuss
Correct Answer: copper
Explanation:
In making jewels, gold is usually mixed with copper to make it little hard.
- 3. Acute diabets patients smell of
Options- A. acetone
- B. ether
- C. ethyl alcohol
- D. methyl alcohol Discuss
Correct Answer: acetone
Explanation:
Acute diabetes results in the formation of acetone in the body. Hence such patients smell of acetone.
- 4. Alum is used
Options- A. as an analgesic
- B. in the purification of water
- C. as a fertilizer
- D. as a disinfectant Also asked in: AIEEE
Correct Answer: in the purification of water
Explanation:
Alum is a common alum, potassium aluminum sulphate which makes colloidally suspended impurities in water such as clay to settle down.
- 5. The soaps used in shaving cream are
Options- A. Calcium soaps
- B. lead soaps
- C. soft soaps
- D. hard soaps Discuss
Correct Answer: soft soaps
- 6. Which is the Lightest of all the metals?
Options- A. Hydrogen
- B. Lithium
- C. Sodium
- D. Pottasium Discuss
Correct Answer: Lithium
Explanation:
Lithium is the lightest of all the metals due to its low atomic number among meetals
- 7. One method by which the components of air can be seperated is
Options- A. shaking with caustic soda solution
- B. shaking with water
- C. fractional distillation of liquid air
- D. passing air over heated magnesium Discuss
Correct Answer: fractional distillation of liquid air
Explanation:
The two main components of air are nitrogen and oxygen. They are seperated by the fractional distillation of liquid air. Liquefied air contains liquid nitrogen and liquid oxygen. Liquid nitrogen with the lower boiling point more readily evaporates than the less volatile liquid oxygen.
- 8. If people sleep in closed rooms where charcoal fire is burning , they die due to
Options- A. carbon monoxide
- B. carbon dioxide
- C. methane
- D. phosgene Discuss
Correct Answer: carbon monoxide
Explanation:
A closed room is aplace where charcoal is burnt in limited supply of air. There is every chance for the formation of the deadly poisonous carbon monoxide, which when inhaled, reacts with the iron in haemoglobin of blood and prevents the supply of oxygen. It is said to be treacherous as there can be no previous warning of its presence because it is an odourless and colourless gas.
- 9. Which one of the following laws explain the formation of carbon monoxide and carbon dioxide from carbon and oxygen
Options- A. Laws of conservation of mass
- B. Laws of multiple proportion
- C. Laws of reciprocal proportions
- D. Law of definite proportions Discuss
Correct Answer: Laws of multiple proportion
- 10. Isotopes of the atoms of same element have
Options- A. same number of neutrons
- B. same number of protons
- C. same atomic mass
- D. different chemical properties Discuss
Correct Answer: same number of protons
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