Chemistry Test 226

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Chemistry Test 226

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Weekly Quiz Competition

Question 1
4 / -1

Number of atoms present in 52 g of helium is:

(N_A is Avogadro’s constant Gram atomic mass of He is 4 g)

A
26 N_A

B
N_A

C
13 N_A

D
52 N_A

Solution

Gram atomic mass of helium is 4 g so number of atoms present in 52 g of helium

52/4 × N_A = 13 N_A
Question 2
4 / -1

The vapour density of a mixture of gas A (Molecular mass = 40) and gas B (Molecular mass = 80) is 25.Then mole % of gas B in the mixture would be

A
25%

B
50%

C
75%

D
10%

Solution
Question 3
4 / -1

Atomic mass of Cl is 35.5 g. Calculate the mass of 4.50 moles of chlorine gas, Cl₂.

A
6.34 g

B
4.5 g

C
160 g

D
319.5 g

Solution

Mass of 1 mole of Cl₂is 71 g. Hence mass of 4.50 moles is 71 X 4.50 = 319.5 g
Question 4
4 / -1

Atomic mass of bromine is 80 g. The mass of four moles of molecular bromine (Br₂) is:

A
80 g

B
40 g

C
640 g

D
320 g

Solution

Mass of one mole of Br₂is 160g. Hence mass of four moles of molecular bromine is 4 X 160 = 640 g.
Question 5
4 / -1

Modern periodic table is based on atomic no. experiments which proved importance of at no. was -

A
Braggs work on X-ray diffraction

B
Moseleys work on X-ray spectrum

C
Mulliken’s oil drop experiment

D
Lother meyer curve plotted between at vol. & at wt.

Solution

Moseley's work on X-ray spectra proved the significance of the atomic number.
Question 6
4 / -1

Atomic no. is the base of -

(i) Lother meyer curve

(ii) Newland octave rule

(iii) Modern periodic table

(iv) Doeberiener triad rule

(v) Long form of periodic table

A
(i), (ii), (iv)

B
(iii), (v)

C
(i), (iv)

D
(i), (iii), (v)

Solution

Modern periodic table and long form of periodic table are same. Both are based on atomic number rather than atomic mass.
Question 7
4 / -1

Atomic wt. or Cl = 35.5 and of I = 127. According to doeberiner triad rule, At. wt. of Br will be -

A
80.0

B
162.5

C
81.25

D
91.5

Solution
Question 8
4 / -1

The elements of groups, 1, 2, 13, 14, 15, 16 and 17 are collectively called -

A
Noble gases

B
Representative or normal elements

C
Transition elements

D
Inner transition elements

Solution

Representative elements in modern periodic table

The first two groups on the extreme left and last six groups on the extreme right involve the filling of s- and p- orbitals, respectively, These groups represent the main groups of the periodic table and are numbered as 1, 2, 13, 14, 15, 16, 17 and 18. The elements present in these groups are known as normal elements or representative elements.
Question 9
4 / -1

Justification of putting H in VII A group is -

A
H is gas

B
H is non metal

C
It form NaH like salt

D
It has ortho and para allotropes

Solution

The reason for the putting of VII A group is that the reaction of hydrogen with group 1 elements as the same as that of other halogens.
Question 10
4 / -1

The discovery of which of the following group of elements gave a death blow to the Newlands Law -

A
Inert gases

B
Alkali metals

C
Transuranic element

D
Halogens

Solution

The discovery of zero group of elements (inert gases) gave a death blow to the Newland's Law.

According to Newlands Law of octaves, when the elements are arranged in the increasing order of atomic weights, the properties of every eight element are similar to the first one.

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Re-Attempt Weekly Quiz Competition

Chemistry Test 226

Result

Chemistry Test 226

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-

Rank

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Question 1

26 NA

NA

13 NA

52 NA

Solution

Question 2

25%

50%

75%

10%

Solution

Question 3

6.34 g

4.5 g

160 g

319.5 g

Solution

Question 4

80 g

40 g

640 g

320 g

Solution

Question 5

Braggs work on X-ray diffraction

Moseleys work on X-ray spectrum

Mulliken’s oil drop experiment

Lother meyer curve plotted between at vol. & at wt.

Solution

Question 6

(i), (ii), (iv)

(iii), (v)

(i), (iv)

(i), (iii), (v)

Solution

Question 7

80.0

162.5

81.25

91.5

Solution

Question 8

Noble gases

Representative or normal elements

Transition elements

Inner transition elements

Solution

Question 9

H is gas

H is non metal

It form NaH like salt

It has ortho and para allotropes

Solution

Question 10

Inert gases

Alkali metals

Transuranic element

Halogens

Solution

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26 N_A

N_A

13 N_A

52 N_A