Tag: chemistry

Questions Related to chemistry

Mass (g)
Empty crucible $22.01$
Crucible and copper oxide $42.01$
Crucible and copper product $(1^{st}mass)$ $39.87$
Crucible and copper product $(2^{nd}mass)$ $38.01$
Crucible and copper product $(3^{rd}mass)$ $38.01$

Copper ions can have multiple oxidative states. The data table above was obtained during a lab in which an unknown copper oxide was heated in a crucible.
From this data, what is the name of the unknown copper oxide?

chemistry d- and f-block elements some important compounds of transition elements general properties of transition metals the d-and f-block elements

  1. Copper(I) oxide.

  2. Copper (II) oxide.

  3. Copper (I) peroxide.

  4. Copper (II) peroxide.

Show answer
Correct Option: A
State True or False.
Fe$ _3$O$ _4$ is mixed oxide of FeO and Fe$ _2$O$ _3$. 
chemistry d- and f-block elements some important compounds of transition elements general properties of transition metals the d-and f-block elements

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Iron (II,III) oxide is the chemical compound with formula $Fe _3O _4$. It occurs in nature as the mineral magnetite. It is one of a number of iron oxides, the others being iron(II) oxide ($FeO$), which is rare, and iron(III) oxide ($Fe _2O _3$) also known as hematite. $Fe _3O _4$ contains both $Fe^{2+}$ and $Fe^{3+}$ ions and is sometimes formulated as FeO ∙ Fe2O3. 

The molecular formula of Rinmann's green is:

chemistry d- and f-block elements some important compounds of transition elements general properties of transition metals the d-and f-block elements

  1. $FeSO _{4}7H _{2}O$

  2. $CrCl _{3}$

  3. $NiSO _{4}7H _{2}O$

  4. $CoOZnO$

Show answer
Correct Option: D
Explanation:

Rinmanns green (CoO.ZnO) Cobalt green, is a translucent green pigment made by mixing cobalt(II) oxide and zinc oxide.

The metals present in insulin and haemoglobin are respectively:

chemistry biomolecules enzymes and hormones hormones coordination in human beings- chemical control

  1. $Zn, \ Hg$

  2. $Zn,\ Fe$

  3. $Co,\ Fe$

  4. $Mg,\ Fe$

Show answer
Correct Option: B
Explanation:
Insulin contains zinc and haemoglobin contains Fe. (Iron)

Hence, option B is correct.

Which of following hormone is produced by testis?

chemistry biomolecules enzymes and hormones hormones coordination in human beings- chemical control

  1. Progesterone

  2. Estradiol

  3. Testosterone

  4. estrone

Show answer
Correct Option: C
Explanation:

Testosterone is produced by testes. Testosterone, which is produced in the body by the male testes, influences men physically, emotionally and sexually. It is called the "king of hormones", testosterone is certainly the most important hormone when it comes to sexual characteristics in men.

Androgens are

chemistry biomolecules enzymes and hormones hormones coordination in human beings- chemical control

  1. female sex hormone

  2. non steriod

  3. plant hormone

  4. male sex hormones

Show answer
Correct Option: D
Explanation:

Androgens are male sex hormones. The main androgen is testosterone, and an additional androgen is dihydrotestosterone. Testosterone is secreted mainly by the testes, but also a little bit by the adrenal cortex. In some tissues, testosterone is chemically changed into dihydrotestosterone in order to have an effect.

Which of the following is a steroid?

chemistry biomolecules enzymes and hormones hormones coordination in human beings- chemical control

  1. Insulin

  2. Vitamins

  3. Cytokinins

  4. Estrogen

Show answer
Correct Option: D
Explanation:

Estrogen is a steroid. Estrogens are a group of steroid hormones that control the development and maintenance of an individual's feminine characteristics. Natural estrogens exist in men as well as women, and are found in higher amounts in women, especially in those of reproductive age.

Which bond angle $\theta $ gives maximum dipole moments for triatomic molecule $XY _{ 2 }$ :-

chemistry biomolecules enzymes and hormones hormones coordination in human beings- chemical control

  1. $\theta \quad =\quad 90^{ \circ }$

  2. $\theta \quad =\quad 120^{ \circ }$

  3. $\theta \quad =\quad 180^{ \circ }$

  4. Both 2 and 3

Show answer
Correct Option: B

Deficiency of insulin in human beings causes:

chemistry biomolecules enzymes and hormones hormones coordination in human beings- chemical control

  1. Blood coagulation

  2. Beri Beri

  3. Diabetes

  4. Dermatitis

Show answer
Correct Option: C
Explanation:

Deficiency of insulin in human beings causes diabetes.


 Diabetes is a disease in which your blood glucose or blood sugar levels are too high, either because insulin production is inadequate, or because the body's cells do not respond properly to insulin, or both.

Option C is correct.

Point out the wrong statement about proteins.

chemistry biomolecules enzymes and hormones hormones coordination in human beings- chemical control

  1. They are nitrogenous organic compounds of high molecular mass.

  2. They on hydrolysis by enzymes give aminoacids.

  3. Many of them are enzymes.

  4. They do not contain polypeptide .

Show answer
Correct Option: D
Explanation:

Proteins are nitrogenous organic compounds of high molecular mass which on hydrolysis by enzymes give amino acids. All proteins are enzymes. They do not contain polypeptide but are bonded by peptide linkage.