Which statement best describes the Fourteenth Amendment? It granted citizenship to all individuals living in the United States. It enfranchised all male citizens and gave them the right to vote. It prevented states from denying citizens equal protection under the law. It allowed states to seize citizens’ property without due process of the law.

Step-by-step explanation:

i) Ascending order = – 7, – 3, 3, 5 Descending order = 5, 3, – 3, – 7 (ii) Ascending order = – 2, – 1, 0, 3 Descending order = 3, 0, – 1, – 2 (iii) Ascending order = – 6, 1, 3 Descending order = 3, 1, – 6 (iv) Ascending order = – 5, – 1, 2, 4 Descending order = 4, 2, – 1, –

Answer:

It a=8, then a + 19 = 8 + 19 = 27.

Hence, the greatest values of a and b are 8 and 5 respectively, and the number

Exercise 2.2

1. Test the divisibility by 2,3,5 and 9.

(a) 80+9

(b) 400+70+ 5

(c) 9000 + 600+20+1

2. Find the least value of bin 900 +10b+6 to make it divisible by 3 and 9 both.

3. Give two examples of a number which is divisib! by:

(a) 3 but not 9

(b) 2 but not 6

(c) 2 and 4 but not 8.

4. Write down all the possible numbers, which are divisible by 2, using the digits 3,9, 0 and 2 only once.

5. Using the tests of divisibility, determine which of the following numbers are divisible by 9:

(a) 1258

(b) 4338

(c) 7905

(d) 63909

6. Write the smallest and the greatest values of a in each of the following numbers so that the number formed is

divisible by 3:

(a) a6724

(b) 4765a2

7. Write the values of a andb in the following odd numbers so that the numbers formed are divisible by 3 and 5:

(a) 7a25

(b) 8ab4b

8. Place the digit 1 to 9 in the circle so that the sum of three numbers on each

diameter equals 15.

9. Find the least value of C'in 900 + 30+C to make it divisible by 5 and 10 bath.

0. A number 600+30+C is multiplied by 3 to get a number exactly divisible by 9 find the value

of C

Answer :-

[tex]\rightarrow[/tex] Due to small size and similar charge/mass ratio,boron differs from other group 13 members, but it resembles closely with silicon , the second elements of group 14 to exhibit diagonals relationship, Some important similarities between boron and silicon are given below ;

[tex]\star[/tex] Both boron and silicon are typically non metals , having high melting point, and boiling point with nearly same densities low atomic volumes and a bad conductor of current . However both are semiconductor.

[tex]\star[/tex] Both of them do not form cation and form only covalent compounds.

[tex]\star[/tex] Both exists in amorphous and crystalline state and exhibit allotropy.

[tex]\\{\orange{\underline{\red{\underline{Additional\: information}}}}}[/tex]

The diagonal relationship between Boron and Silicon shows Anamolous behaviour in its group because of its small size and non availability of D oribital it resembles as silicon the second member of the next higher group.

(1) Formation of acids

[tex]\rightarrow[/tex] Boron and silicon forms weak acids as [tex]\color{green}H_{3}BO_3[/tex] and [tex]\color{green}H_{4}SlO_{4}[/tex]

(2) Nature

[tex]\rightarrow[/tex] Both the elements are semiconductor.

(3) Cation/Anion

[tex]\rightarrow[/tex] Both silicon and boron do not form captions.

(4) Metals/ Non metals

[tex]\rightarrow[/tex] Both boron and silicon are non-metals.

(5) oxides formation

[tex]\rightarrow[/tex] Boron form boxides and silicon form silicides.

[tex]\color{red}{3}[/tex] mg + [tex]\color{red}{2}[/tex] B [tex]\rightarrow[/tex][tex]Mg_{3}[/tex][tex]\rightarrow[/tex] Magnesium boride.

2mg + Si [tex]\rightarrow[/tex] [tex]Mg_{2}[/tex]Si [tex]\rightarrow[/tex] Magnesium silicide

Answer:

Because crossing and descending the periodic table have opposing effects, there is a diagonal relationship. It is primarily owing to the polarising power of ions.

Explanation: 

In the 2nd and 3rd periods of the periodic table (the first[tex]20[/tex]elements), a diagonal relationship is believed to exist between certain pairs of diagonally adjacent elements.

• Because crossing and descending the periodic table have opposite effects, a diagonal relationship emerges. When crossing a period of the periodic table, the size of the atoms decreases, and when descending a group, the size of the atoms grows.
• Similarly, as the period progresses, the elements get more covalent, less reducing, and more electronegative, but as the group progresses, the elements become more ionic, basic, and less electronegative.
• As a result, the changes balance out whether descending a group or crossing by one element, and elements with identical characteristics and chemistry are frequently identified.
• Silicon and boron are both semiconductors. They produce acidic oxides when they are hydrolyzed in water.

Answer:

In [tex]\frac{60}{11}[/tex] days ,the work get completed if the work simultaneously.​

Step-by-step explanation:

Given,

         A can complete a work in 10 days.

         A can complete work in one day=[tex]\frac{1}{10} work[/tex]

          B can complete the same work in 12 days

          B can complete work in one day=[tex]\frac{1}{12} work[/tex]

A and B will do work in a day=

                                            [tex]\frac{1}{10}+\frac{1}{12}[/tex]

L.C.M between 10 and 12 is 60

              [tex]=\frac{6+5}{60} \\ \\ =\frac{11}{60}[/tex]

        So together they can complete work in [tex]=\frac{60}{11}[/tex] days.

Step-by-step explanation:

Given,

A can complete a work in 10 days.

A can complete work in one day=\frac{1}{10} work

10

1

work

B can complete the same work in 12 days

B can complete work in one day=\frac{1}{12} work

12

1

work

A and B will do work in a day=

\frac{1}{10}+\frac{1}{12}

10

1

+

12

1

L.C.M between 10 and 12 is 60

\begin{gathered}=\frac{6+5}{60} \\ \\ =\frac{11}{60}\end{gathered}

=

60

6+5

=

60

11

Answer:

Energy radiated from Earth's surface as heat, or infrared radiation, is absorbed and re-radiated by greenhouse gases, impeding the loss of heat from our atmosphere to space. Greenhouse gases in the atmosphere repeatedly absorb and re-radiate infrared radiation (heat).

Answer:

The heat radiated by the earth is called Infrared radiations.

Explanation:

Continuous solar radiations are let out by the sun that reach the earth's surface either getting absorbed or re-radiated into the atmosphere and is called long-wave radiation. Although it is invisible, we can still feel the heat.

The re-radiated heat depends on a number of factors including:

• Concentration of greenhouse gases: The gases absorb and re-radiate the solar radiation, thereby increasing the earth's average temperature.
• The pattern and distribution of clouds: Thin and high clouds are cooler than the earth's surface thus, they absorb much of the heat. In contrast, thick and low clouds have a higher temperature and so they reflect most of the heat in this way they also contribute to the greenhouse effect.