Chemistry problems
- 1. A by product of involuntary muscle contraction and relaxation is
Options- A. Oxygen
- B. Water
- C. Heat
- D. Nitrogen Also asked in: AIEEE, Bank Exams, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Heat
- 2. The mass of a mole of NaCl is the
Options- A. 58.44 gm/mol
- B. 57.25 gm/mol
- C. 56.31 gm/mol
- D. 59.14 gm/mol Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: 58.44 gm/mol
Explanation:
To get the mass of a mole of NaCl, we need to add the molar atomic weights of the individual elements i.e, Na and Cl
Atomic weights of Na = 22.99 gm/mol Cl = 35.45 gm/mol
Now, mass of a mole of NaCl = 22.99 + 35.45 = 58.44 gm/mol.
- 3. Compounds are formed as a result of chemica change.
Options- A. TRUE
- B. FALSE Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: TRUE
Explanation:
TRUE, the compounds are formed as a result of chemical change.
- 4. Identify the metalloid in the following list?
Options- A. Silicon
- B. Sulphur
- C. Scandium
- D. All of the above Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO, Database Administrator, IT Trainer
Correct Answer: Silicon
Explanation:
A metalloid is an element with properties between metals and non metals or the mix of both.
The six metalloids are arsenic, silicon, germanium, boron, antimony and tellurium.
Hence, silicon is the only metalloid in the given list.
- 5. Is deposition endothermic or exothermic?
Options- A. Endothermic
- B. Exothermic
- C. Both A & B
- D. Can't be determined Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Exothermic
Explanation:
In thermodynamics, deposition is a phase transition in which gases are directly transformed to solids without converting to liquids first.
For example, watervapour is directly changed to ice without first becoming to liquid water. In this process, heat is released making the process exothermic process.
- 6. Atoms have no electric charge because they
Options- A. have same number of electrons and neutrons
- B. have same number of electrons and protons
- C. have same number of protons and neutrons
- D. have same number of protons, electrons and neutrons Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: have same number of electrons and protons
Explanation:
Atoms are composed of three main particles called electrons, protons and neutrons. We know that, the electrons are negatively charged particles whereas protons are positively charged and neutrons have no charge.
Hence, as the number of electrons and protons are equal and they are oppositely charged, the atom will have no charge as their charges cancel each other.
- 7. Oxidation number of S8 ?
Options- A. +1
- B. -2
- C. +2
- D. 0 Also asked in: GATE, Bank Exams, AIEEE, Bank PO, Bank Clerk, Analyst
Correct Answer: 0
Explanation:
is an elemental form of sufur. In elemental form it can't be reduced or oxidized. Hence, it oxidation number is zero and thus sulfur is zerovalent here.
- 8. Which statement describes the acid found in vinegar acetic acid ?
Options- A. It feels slippery
- B. It reacts with Mg to produce H2
- C. It tastes bitter
- D. It releases OH- in a solution Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: It reacts with Mg to produce H2
Explanation:
Acid which is present in vinegar is approximately 5 % of acetic acid. This can be confirmed by testing the vinegar with magnesium which gives out hydrogen as a gas.
- 9. What is the name for the compound P4O10 ?
Options- A. Phospholipid
- B. Phosphoric acid
- C. Phosphorus pentoxide
- D. Phosphorus decoxide Also asked in: GATE, CAT, Bank Exams, AIEEE, Bank PO, Bank Clerk, Analyst
Correct Answer: Phosphorus pentoxide
Explanation:
The compound with the molecular formula is called Phosphorus pentoxide or tetraphosphorous decoxide. It is an anhydride of the Phosphoric acid.
- 10. Which is a pair of allotropes?
Options- A. carbon-16 and carbon-12
- B. diamond and graphite
- C. carbon dioxide and graphite
- D. diamond and carbon dioxide Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: diamond and graphite
Explanation:
Allotropes are the different physical forms of an element. Here in the given options, diamond and graphite are the pair of allotropes of carbon.
Some more examples are Molecular oxygen and ozone are pair of allotropes, Black and red phosphorous are also pairs of allotropes.
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