Tag: chemistry

Questions Related to chemistry

Borax bead test is given by:

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. $Na{NO} _{3}$

  2. $Fe{SO} _{4}$

  3. $Cu{SO} _{4}$

  4. ${NH} _{4}Cl$

Show answer
Correct Option: C
Explanation:

Borax bead test is given by $CuSO _{4}$, hence, option C is correct.

Which of the following fact(s) explain(s) as to why p-
nitrophenol is more acidic than phenol?
I. - I Effect of nitro group.
II. Greater resonance effect of $p$ -nitrophenoxy group
II. Steric effect of bulky nitro group

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. I and II

  2. I and III

  3. II and III

  4. II alone

Show answer
Correct Option: A
Explanation:
P nitrophenol is stronger acid than phenol
The nitro-group is an electron-withdrawing group. The presence of this group in the ortho or para position decreases the electron density in the OH bond. As a result, it is easier to lose a proton. ... Hence, ortho and para nitrophenols are stronger acids than phenol.

Equimolar mixture of a $\alpha-D(+)$- glucose and $\beta-D(+)$-glucose has specific rotation (${[\alpha]} _{D}$) is:

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. $-{92.4}^{o}$

  2. $+{112.5}^{o}$

  3. $+{52.5}^{o}$

  4. $-{19.2}^{o}$

Show answer
Correct Option: C
Explanation:
The specific rotation of α-D-glucopyranose decreases from +112° to +52.5°.
The specific rotation of β-D-glucopyranose increases from +19° to +52.5°.
The specific rotation of equimolar mixture of  $\alpha$ - D(+) - glucose and $\beta$ - D(+) - glucose has a specific rotation $52.5^0$.

Hence, the correct option is C.

When does a precipitate form?

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. When something is insoluble in solution.

  2. When something is soluble in solution.

  3. When too much of a substance is added to solution.

  4. Whenever a solid is added to solution.

  5. Whenever liquid is added to a solution.

Show answer
Correct Option: C
Explanation:

When too much of a substance is added to solution, a precipitate forms.
Also, when ionic product exceeds solubility product, the precipitation occurs.
In a supersaturated solution, the excess ions recombine to form solid which results in precipitation.

What is a macromolecule?

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. A huge molecule made up of smaller sub units called monomers

  2. A huge molecule made up of smaller sub units called polymers

  3. A huge molecule found only in living things

  4. A huge molecule that contains carbon

  5. A molecule made of larger subpieces

Show answer
Correct Option: B
Explanation:

A macromolecule is a term used to contrast a micromolecule (which is smaller in size and in molecular weight). Macromolecules are usually used to refer to large biological polymers, such as nucleic acids and proteins, which are made up of small monomers linked together.

Which of the following method is the fastest and most cost-efficient method for determining the order of the reaction involved in the laboratory?

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. Mass spectrometry

  2. Spectrophotometry

  3. Titration

  4. Paper chromatography

Show answer
Correct Option: A
Explanation:

Mass spectrometry (MS) is an analytical technique that measures the mass-to-charge ratio of ions. The results are typically presented as a mass spectrum, a plot of intensity as a function of the mass-to-charge ratio.It helps in calculating order of reaction.

Which of the following anions neutralize the acidic pH of the chime that enters into the duodenum from the stomach?

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. $H _2PO^- _4$

  2. $HSO^- _4$

  3. $HCO^- _3$

  4. $CH _3COO^-$

Show answer
Correct Option: C
Explanation:

$HCO _3$ which is produced by the duct cells helps in neutralizing the acidic chime. It creates an optimum pH for the digestive enzymes in the duodenum.

Which organic macromolecule is responsible for genetic information?

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. Nucleic Acid

  2. Protein

  3. Nucleus

  4. Lipid

  5. Carbohydrate

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Correct Option: A
Explanation:

Nucleic acid are the organic molecules responsible for genetic information.
Organic Macro-molecules: Organic compounds are those that contain carbon (e.g. carbohydrates, lipids, proteins, nucleic acids).

What is the coordination number of body centred cube?

chemistry measurement and data processing and analysis spectroscopic identification of organic compounds materials science introduction superconducting metals and x-ray crystallography

  1. 8

  2. 6

  3. 4

  4. 12

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Correct Option: A

Which of the following is scientific explanation of depression?

drug-target interaction pharmaceutical products and drug action medicinal chemistry chemistry in everyday life chemistry body defense system

  1. An increased level of sugar in the blood leads to depression.

  2. Low levels of noradrenaline, a neurotransmitter in the blood lead to depression.

  3. Release of extra gastric juice in the stomach lead to depression.

  4. Sleep incducing drugs lead to depression.

Show answer
Correct Option: B
Explanation:

Noradrenaline is a neurotransmitter that plays a role in mood swings. Low levels of noradrenaline lower the signal-sending activity and make the person suffers from depression.