Chemistry problems
- 1. What is a normal pH level in blood?
Options- A. 7.35 - 7.45
- B. 7.45 - 7.55
- C. 7.6 - 7.7
- D. 7 - 7.10 Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: 7.35 - 7.45
- 2. Which metal pollute the air of a big city?
Options- A. Chromium
- B. Lead
- C. Copper
- D. Zinc Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: Lead
- 3. Which equation is an example of a synthesis reaction?
Options- A. 2H2 + O2 ? 2H2O
- B. Na + Cl ? NaCl
- C. HA + BOH ? H2O + BA
- D. NaCl + AgNO3 ? NaNO3 + AgCl Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Na + Cl ? NaCl
Explanation:
When two or more chemical species combine to form a single product, the reaction is said to be synthesis reaction. It is also called as Direct Combination reaction.
Here in the given options, Sodium (Na) combines with Chlorine (Cl) to form a more complex single product Sodium Chloride (NaCl).
- 4. The chemical name of common salt is
Options- A. Sodium Chloride
- B. Potassium Nitrate
- C. Sodium Nitrate
- D. Potassium Chloride Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: Sodium Chloride
Explanation:
The chemical name of common salt is Sodium Chloride with a chemical formula NaCl.
- 5. Which is a compound that contains carbon?
Options- A. Ethane
- B. Propane
- C. Methane
- D. All of the above Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: All of the above
Explanation:
The compound methane is a simple hydrocarbon contains one carbon bonded to four hydrogens. Ethane is a simple hydrocarbon which contains two carbon atoms and four hydrogen atoms. Similarly, propane with three carbons.
- 6. In which of the following activities silicon carbide is used
Options- A. Disinfecting water of ponds
- B. Making casts for statues
- C. Making cement and glass
- D. Cutting very hard substances Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: Cutting very hard substances
- 7. Monazite is an ore of
Options- A. Platinum
- B. Radium
- C. Uranium
- D. Lanthanum Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: Lanthanum
Explanation:
Monazite is an ore of cerium, thorium and lanthanum.
- 8. Which process is a chemical change?
Options- A. Burning gasoline
- B. Boiling water
- C. Evaporating water
- D. Melting ice Also asked in: AIEEE, Bank Exams, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Burning gasoline
Explanation:
Burning gasoline is the only process that involving in a chemical change in the given options. A chemical change is a change in the starting substances that are called reactants from the formed new substances that are called products.
- 9. Carbon disulfide is prepared by heating sulfur and charcoal.
Options- A. TRUE
- B. FALSE Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: TRUE
Explanation:
Yes, Carbon disulfide is prepared by heating sulfur and charcoal.
S2 + C ----> CS2
- 10. Which formula represents a polar molecule?
Options- A. C - O
- B. C - N
- C. H - N
- D. All of the above Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: All of the above
Explanation:
A chemical bond in which the electrons are not shared equally due to differences in the electronegativity of the atoms.
The polarity of a covalent bond is measured using its dipole moment.
? Large dipole moment = more polar
? Small dipole moment = more nonpolar.
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