Question 1

Which of the following statements is not correct?

Accepted Answer

There are also other halous acids like: HOBr_2  which is Hydrobromous acid.So D is wrong

Question 2

Which of the following exist?

Accepted Answer

In interhalogen compounds, take example  XX'_n , the central atom is  X  here. The compound exists only when  X  is of larger size and  X'  is of smaller size and  X  is more electronegative than  X' . From this condition,  ICl_3, \ IF_7   and  BrF_3  exists. ClF_3  does not exist because the difference between the size of  Cl  and  F  is very small.

Question 3

Mono atomic element among the following is:

Accepted Answer

Oxygen is diatomic gas.  Phosphorous is tetra atomic.Sulphur is polyatomic.Whereas being an inert gas, Krypton is monoatomic.

Question 4

The elements with atomic numbers  2, 10, 18, 36, 54  and  86  are collectively known as:

Accepted Answer

Zero group of Mendeleev's periodic table or the group  18  of long form of periodic table is comprised of six elements and these eleements are called as inert gases as trhese elements do not react (inert) with other elements due to their octet outer electronic configaration which is stable configaration. The electronic configuration is listed in the following table.          S.No Element Symbol Atomic number Electronic  configuration1 Helium He21s2 2 Neon Ne10[He] 2s2sp63 Argon Ar18[Ne] 3s23p6            4 Krypton Kr36            [Ar] 3d104s24p6                                            5 Xenon Xe54            [Kr] 4d105s25p6                      6 Radon Rn 86[Xe] 4f145d106s26p6

Question 5

Which of the following electronic configuration corresponds to an inert gas?

Accepted Answer

Noble gases have full-filled configuration i.e the subshell are completely filled.They have the general electronic configuration as  ns^2 np^6 . Thus option B represents a noble gas.

Question 6

Elements with atomic numbers 9, 17, 35, 53 are collectively known as:

Accepted Answer

Elements having the atomic number:9 is fluorine:  (He)2s^22p^5 17 is chlorine:  (Ne)3s^23p^5 35 is bromine:  (Ar)4s^24p^5 53 is iodine:  (Kr)5s^25p^5 We can observe here that all these elements having the general electronic configuration of  ns^2np^5 , hence these elements belong to  17^{th}  group elements.

Question 7

The inert gas present in the second long period is:

Accepted Answer

Periods  4  and  5  are called long periods as they contain  18  elements each.  4 th period is called the first long period and the inert gas in this period is  Kr . 5 th period is the second long period where  Xe  is the inert gas element.

Question 8

Al+X\overset{\Delta}{\rightarrow} Y \overset{H_{2}O}{\rightarrow} Z+NH_{3} Here  X, Y  and  Z  are respectively:

Accepted Answer

2Al+N_{2}\overset{\Delta}{\rightarrow}2AlN\overset{H_{2}O}{\rightarrow}Al(OH)_{3}+NH_{3}

Question 9

If a new noble gas is discovered then, what will be its atomic number?

Accepted Answer

Rn = 86+ 32 = 118 The atomic number of next inert gas to be discovered will be  118 .

Question 10

The outer most electronic configuration of the most electronegative element is:

Accepted Answer

Halogens are most electronegative.Therefore outer electronic configuration is  ns^{2}\ np^{5}. Option C is correct.

The P Block Elements

Chemistry
163 Views

Which of the following statements is not correct?

Which of the following exist?

Mono atomic element among the following is:

The elements with atomic numbers $2, 10, 18, 36, 54$ and $86$ are collectively known as:

Which of the following electronic configuration corresponds to an inert gas?

Elements with atomic numbers 9, 17, 35, 53 are collectively known as:

The inert gas present in the second long period is:

$A l + X \to Δ Y \to H_{2} O Z + N H_{3}$
Here $X, Y$ and $Z$ are respectively:

If a new noble gas is discovered then, what will be its atomic number?

The outer most electronic configuration of the most electronegative element is:

The P Block Elements

Chemistry 163 Views

Which of the following statements is not correct?

Which of the following exist?

Mono atomic element among the following is:

The elements with atomic numbers 2,10,18,36,54 and 86 are collectively known as:

Which of the following electronic configuration corresponds to an inert gas?

Elements with atomic numbers 9, 17, 35, 53 are collectively known as:

The inert gas present in the second long period is:

Al+X→ΔY→H2​OZ+NH3​ Here X,Y and Z are respectively:

If a new noble gas is discovered then, what will be its atomic number?

The outer most electronic configuration of the most electronegative element is:

Chemistry
163 Views

The elements with atomic numbers $2, 10, 18, 36, 54$ and $86$ are collectively known as:

$A l + X \to Δ Y \to H_{2} O Z + N H_{3}$
Here $X, Y$ and $Z$ are respectively: