Question

1. Which of the following statements gives the best explanation for the fact that
carbon forms 4 bonds?
A. Carbon forms 4+ ions.
B. Carbon is in Group 4 of the periodic table.
C. Carbon has 2 energy levels or shells of electrons.
D. Carbon has 4 electrons in its outermost energy level or shell.
2. Which of the following explains why there are many carbon compounds?
A. Carbon atoms form single bond or double bonds.
B. Carbon atoms form covalent bonds with other elements.
C. Carbon atoms are not easily affected by water and oxygen.
D. Carbon atoms bond with other carbon atoms in different molecular
patterns.

22

3. Which of the following is NOT a property of carbon?
A. can form rings
B. can form double bonds
C. has three valence electrons.
D. can form bonds with four atoms
4. How many atomic orbitals are mixed or combined in the sp3 hybridization?
A. 1 B. 2 C. 3 D. 4
5. How many covalent bonds are formed when carbon atom uses the sp3 orbitals?
A. 2 B. 3 C. 4 D. 5
6. I am a covalent bond where two atoms share two electrons (one from each
atom) with one another. What type of covalent bond am I?
A. Double bond C. single bond
B. Quadruple bond D. triple bond
7. What is the measurement of the tetrahedral bonding angles of carbon?
A. 45.5 degrees C. 109.5 degrees
B. 90.2 degrees D. 120 degrees
8. Which of the following best describes the carbon bond type shown in the
diagram below?

A. Two double bonds, each sharing 8 valence electrons with an atom
B. Two double bonds, each sharing 6 valence electrons with an atom
C. Two double bonds, each sharing 4 valence electrons with an atom
D. Two double bonds, each sharing 2 valence electrons with an atom
9. What is the maximum number of other atoms to which a given carbon atom
can be attached?
A. 2 B. 3 C. 4 D. 5
10. What hybridization of carbon atoms has occurred in the given figure below?
A. sp c. sp3
B. sp2 d. sp2d2

Answer 1

Solution :

Let the cost price of one computer be x

The second computer be ( 45000-x)

Selling price :

he sold one at a loss of 5%:

100 - 5 = 95.

Loss on CP = 95x/100

He sold others at a profit of 5%:

100 + 5 = 105

Profit on CP = (45000-x)*105/100

Cost Price :

Given : Selling price is same for each computer:

=> 95x/100 = (45000-x)*105/100

=> 95x/100 = (45000 * 105)/100 - 105x/100

=> 95x/100 = 47250 - 105x/100

=> 95x/100 + 105x/100 = 47250

=> 200x/100 = 47250

=> 2x = 47250

=> x = 47250/2

=> x = 23625

So, the cost of first computer is Rs 23,625

The cost of second computer is 45000 - 23625 = Rs 21,375.