Chemistry problems
- 1. Which of these relationships is true of an uncharged atom?
Options- A. The atomic mass is equal to the atomic number.
- B. The number of electrons is equal to the number of neutrons.
- C. The number of protons is equal to the number of electrons.
- D. The atomic mass is equal to the number of electrons. Also asked in: AIEEE, Bank Exams, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: The number of protons is equal to the number of electrons.
Explanation:
The number of protons is equal to the number of electrons. That is the number of positive charges is equal to the number of negative charges.
- 2. Which of the following elements is a metal?
Options- A. Se
- B. I
- C. Zn
- D. S Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Zn
Explanation:
In chemistry, a metal is an element that readily forms positive ions (cations) and has metallic bonds. Metals are opaque, lustrous elements that are good conductors of heat and electricity. Most metals are malleable and ductile and are, in general, denser than the other elemental substances.
Examples of metals are aluminium, copper, iron, tin, gold, lead, silver, titanium, uranium, and zinc.
Here Se - Selenium is an element but is not a metal, S - Sulphur is not a metal and I - Iodine is also not a metal.
Hence, Zn - Zinc is the only metal in the given options.
- 3. Give the common name for the following compound CH32CH CH2 - Br
Options- A. Isobutyl bromide
- B. Methyl bromide
- C. Propyl bromide
- D. Butyl bromide Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Isobutyl bromide
- 4. Milk is an example of a
Options- A. Emulsion
- B. Solution
- C. Gel
- D. Suspension Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Emulsion
Explanation:
Milk is an emulsion of oil in water (o/w).
Emulsion: A suspension of droplets of one liquid in another.
Constituents of milk :
The principal constituents of milk are water, fat, proteins, lactose (milk sugar) and minerals (salts). Milk also contains trace amounts of other substances such as pigments, enzymes, vitamins, phospholipids (substances with fatlike properties), and gases.
- 5. The carbon tetrachloride molecule (CCl4) is
Options- A. a nonpolar molecule with polar bonds
- B. a nonpolar molecule with nonpolar bonds
- C. a polar molecule with polar bonds
- D. a polar molecule with nonploar bonds Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: a nonpolar molecule with polar bonds
Explanation:
The four bonds of carbon tetrachloride (CCl4) are polar, but the molecule is nonpolar because the bond polarity is cancelled by the symmetric tetrahedral shape. Hence, making the net dipole as zero and molecule as non-polar.
When other atoms substitute for some of the Cl atoms, the symmetry is broken and the molecule becomes polar.
- 6. What molecule is indicated by the letter D?
Options- A. ATP
- B. Water
- C. Glucose
- D. Oxygen Also asked in: AIEEE, Bank Exams, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Oxygen
Explanation:
Oxygen is the final electron acceptor of cellular respiration.
- 7. Which sample of matter is a mixture?
Options- A. KBr (S)
- B. NaCl (L)
- C. K (S)
- D. NaCl (Aq) Also asked in: AIEEE, Bank Exams, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: NaCl (Aq)
Explanation:
Mixtures are combination of two or more substances physically which can be separated in to the original.
Matter can be breakdown into two categories.
1) Pure substances
2) Mixtures
Here in the given options, options A, B, C are pure substances as they are indicated as S & L in brackets. Option D) is an aqueous solution, that can be dissolved in water.
- 8. What element behaves most like magnesium?
Options- A. Sr
- B. S
- C. Si
- D. Sn Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Sr
Explanation:
We know that, elements in the same group of the periodic table have similar characteristics. Here magnesium and strontium are the same 2nd group elements and have same behavior.
Therefore, strontium behaves same as magnesium.
- 9. What element is used to disinfect swimming pools?
Options- A. Fluorine
- B. Chlorine
- C. Bromine
- D. Sulphur Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: Chlorine
- 10. Through which conversion is energy released?
Options- A. CO2 and H2O to C6H12O6 and O2
- B. NADP+ to NADPH
- C. ADP to ATP
- D. ATP to ADP Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: ATP to ADP
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