Periodic Classification of Elements- 07

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Q1. Which of the following is a transition element ? *

1 point

Q2. A metal ‘M’ is in the first group of the Periodic Table. What will be the formula of its oxide? *

1 point

M2O

MO2

M2O3

Q3. An element X combines with oxygen to form an oxide XO. This oxide is electrically conducting. Write the formula of the compound formed when X reacts with chlorine. *

1 point

XCl5

XCl

XCl2

XCl3

Q4. Consider the following elements 20Ca40, 8O16 18Ar40, 16S32, 4Be9, 2He4 Which of the above elements would you expect to be in group 16 of the Periodic Table? *

1 point

Ar and S

Ca and O

O and S

Ca and S

Q5. Which one of the following statements is not correct about the trends in the properties of the elements of a group on going down in a group? *

1 point

The metallic character of elements increases.

The valence electrons increase.

The chemical reactivity of metals increases.

The size of the atom increases.

Q6. The atom of an element has electronic configuration 2, 8, 7. To which of the following elements would it be chemically similar? *

1 point

F (9)

Na(11)

N(7)

P(15)

Q7. The metal which is hard and has high melting point and used in filaments of electrical bulbs is *

1 point

Q8. An element has 12 protons. The group and period to which this element belongs to is *

1 point

2nd group, 3rd period

3rd group, 3rd period

2nd group, 2nd period

3rd group, 2nd period

Q9. Upto which element, the Law of Octaves was found applicable? *

1 point

Potassium

Calcium

Cobalt

Oxygen

Q10. At the time of Mendeleev, the number of elements known was *

1 point

Q11. An atom of an element has the electronic confi-guration 2,8,2. To which group does it belong? *

1 point

3rd group

4th group

6th group

2nd group

Q12. Pick out the chemically most reactive elements from the given triads.Li, Na, K F, Cl, Br *

1 point

Li and F

K and Br

K and F

Li and Br

Q13. Which one of the following statements is not correct about the trends in the properties of the elements of a period on going from left to right? *

1 point

The atoms lose their electrons more easily

The elements become less metallic

The oxides become more acidic

There is an increase in the number of valence electrons

Q14. An element has atomic number 17. To which group, period does it belong ? It is metal or non-metal ? *

1 point

17th group, 3rd period, Metal

7th group, 3rd period, Metal

17th group, 3rd period, Non-metal

7th group, 2nd period, Non-metal

Q15. The element which has least tendency to lose electron is *

1 point

Q16. Which of the following is correct order of atomic size ? *

1 point

K < Na < Li < Rb < Cs

Na < K < Li < Rb < Cs

Li > Na > K > Rb > Cs

Li < Na < K < Rb < Cs

Q17. Which of the following is correct order of size ? *

1 point

I– > I > I+

I > I+ > I–

I > I– > I+

I+ > I > I–

Q18. The elements A, B and C belong to group 2, 14 and 16 respectively, of the periodic table. Which of the two elements will form covalent bonds? *

1 point

None of these

B and C

A and B

C and A

Q19. Which of the following is the correct order of the atomic size of the elements oxygen, fluorine and nitrogen? *

1 point

N < F < O

O < F < N

F < O < N

O < N < F

Q20. Which of the following is the most reactive element of the group 16? *

1 point

Magnesium

Sodium

Oxygen

Fluorine

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