Answer : The volume of 1 mole of
and
gases are the same.
Solution: Given,
Moles of
= 1 mole
Moles of
= 1 mole
Moles of
= 2 mole
Formula used for ideal gas is :
P V = n R T
According to the question, the gases are at standard temperature and pressure. So, the volume of gases only depends on the number of moles. This means that the higher the number of moles, higher will be the volume of gas.
The moles of
are more than the moles of
and
. So, the volume of
will be more.
And the moles of
and
are equal. Therefore, their volumes are also equal.
Therefore, the best option is the volume of 1 mole of
and
gases are the same.
Answer:
1/16 is the answer.........
Question 1
The correct answer is a.
Explanation
The relationship between
and
is given by
, We can use
and
. In a we are given the concentration of [OH] and so we use that to find the pOH, then from pOH we can find the pH.
![pOH= -log [2.4 \times 10^-^2] = 1.62\\\\pH = 14 - 1.62= 12.38](https://tex.z-dn.net/?f=pOH%3D%20-log%20%5B2.4%20%5Ctimes%2010%5E-%5E2%5D%20%3D%201.62%5C%5C%5C%5CpH%20%3D%2014%20-%201.62%3D%2012.38)

c. HCl is a strong acid so it dissociates to 0.0001
and 0.0001
, hence
![pH= -log[0.0001] = 4](https://tex.z-dn.net/?f=pH%3D%20-log%5B0.0001%5D%20%3D%204)
![d.pOH= -log [4.4 \times 10^-9] = 8.36\\\\pH= 14- 8.36 = 5.64](https://tex.z-dn.net/?f=%20d.pOH%3D%20-log%20%5B4.4%20%5Ctimes%2010%5E-9%5D%20%3D%208.36%5C%5C%5C%5CpH%3D%2014-%208.36%20%3D%205.64)
has a pH 12.36 which is greater than 7
Question 2
The correct answer is d
.
Explanation
This is because solids and liquids do not appear in the equilibrium constant expression. Since
.
For the equation

![K= \frac{[CO_2][SO_2]}{[O_2]}](https://tex.z-dn.net/?f=K%3D%20%5Cfrac%7B%5BCO_2%5D%5BSO_2%5D%7D%7B%5BO_2%5D%7D)
Question 3
The correct answer is c
In a molecule the oxidation number are assigned to get the sum of a neutral charge or ion. The overall charge of
is -2 and in all its compounds oxygen has -2 charge, hence

Question 4
The correct answer is b. An oxidising agent must gain electrons in a reaction, thus it is the one that undergoes reduction.In order find out what is being reduced we write half reactions for molecules that change their state.
and
are spectactor ions in this reaction.

In the chloride half reaction
gains electrons to become
ions.
Question 5
The last element D is correct. When a nucleus decays by beta emission it produces a daughter nucleus that has same mass number but different atomic number. Therefore beta-decay will have equation

Question 6
The correct answer is a. A beta particle is an electron because it has a charge of -1 and has same mass as an electron, while a positron is a particle with the same mass as an electron but with a positive charge.
Answer: C) rare earth elements are in the first column, on the left.
Explanation:
In fact, rare earth elements are in the third column, on the left.
The periodic table of the elements is an arrangement of the chemical elements in the form of a table, ordered by their atomic number (number of protons), by their configuration of electrons and their chemical properties. It was progressively developed over time as the scientific knowledge advanced; for this reason many modifications and corrections might be done in the future.
This table is divided into rows and columns, which represent the periods and groups or families. For its location the atomic number and valence of each element was considered.
In this sense, the elements in the periodic table are mainly arranged as follows:
-Alkali metals and Alkaline Earth metals in the first two columns, on the left.
-Rare earth elements in the third column (rows 6 and 7), on the left.
-Transition metals in the center.
-Basic metals and semi-metals to the right
-Non-metals to the right (and Hidrogen in the first row and column)
-Noble gases (or inert gases) farthest to the right.
The limiting reactant is the substance which gets used up completely, before the other reactants get consumed in the reaction. Once the system runs out of the limiting reactant, the reaction cannot continue to make products.