Chemistry Questions

Q:

Which one of the following elements does not form solid hydrogen carbonate?

A) Sodium B) Potassium
C) Caesium D) Lithium
 
Answer & Explanation Answer: D) Lithium

Explanation:

Potassium bicarbonate (also known as potassium hydrogen carbonate or potassium acid carbonate) is the inorganic compound with the chemical formula KHCO3. It is a white solid

Sodium bicarbonate is a white solid that is crystalline, but often appears as a fine powder.

LiHCO3 is found in solution form while rest alkali metals hydrogen carbonates are solid due to the anomalous properties of Li and its diagonal relationship with the Mg.

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2 1963
Q:

What unit is used to measure weighted average atomic mass?

A) amu B) gram/mole
C) Both A & B D) 1/mole
 
Answer & Explanation Answer: C) Both A & B

Explanation:

The unit which is used to measure weighted average atomic mass is Atomic Mass Unit (amu).

The amu or gram/mole can also be used for this measure.

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2 1947
Q:

Which equation is an example of a synthesis reaction?

A) 2H2 + O2 → 2H2O B) Na + Cl → NaCl
C) HA + BOH → H2O + BA D) NaCl + AgNO3 → NaNO3 + AgCl
 
Answer & Explanation Answer: B) 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).

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2 1937
Q:

Rayon is chemically

A) Glucose B) Amylase
C) Cellulose D) Pectin
 
Answer & Explanation Answer: C) Cellulose

Explanation:

Rayon is a versatile fiber. Rayon is chemically Cellulose. It is widely claimed to have the same comfort properties as natural fibers, although the drape and slipperiness of rayon textiles are often more like nylon. It can imitate the feel and texture of silk, wool, cotton and linen. The fibers are easily dyed in a wide range of colors.

Rayon_is_chemically1561456278.jpg image

 

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3 1937
Q:

An ionic bond is formed when

A) sharing of electrons B) transfer of electrons
C) Both A & B D) losing of protons
 
Answer & Explanation Answer: B) transfer of electrons

Explanation:

An ionic bond is formed in between the two atoms with the transfer of electrons from an atom to the other to become stable after pairing.

an_ionic_bond_is_formed_when1535690989.jpg image

The atom which has low ionization energy will give some of its electrons to get stable electronic configuration .

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2 1931
Q:

A solution that is hypotonic to a cell has

A) more water molecules surrounding the cell than inside the cell B) more water molecules inside the cell than outside the cell
C) equal water molecules inside and outside the cell D) None of the above
 
Answer & Explanation Answer: A) more water molecules surrounding the cell than inside the cell

Explanation:
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1 1923
Q:

What is the common characteristic of the elements of the same group in the periodic table?

A) Electrons in outer most shell B) Total number of electrons
C) Total number of protons D) Atomic weight
 
Answer & Explanation Answer: A) Electrons in outer most shell

Explanation:
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4 1922
Q:

Vinegar is __________ .

A) diluted acetic acid B) glacial acetic acid
C) glacial formic acid D) diluted formic acid
 
Answer & Explanation Answer: A) diluted acetic acid

Explanation:
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1 1919