Chemistry Test

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Chemistry Test - 58

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Weekly Quiz Competition

Question 1
1 / -0

' Yellow cake ' an item of smuggling across border s

A
A crude form of heroin

B
A crude form of cocaine

C
Uranium oxide

D
Unrefined gold

Solution

' Yellow cake ' an item of smuggling across borders Uranium oxide.
Question 2
1 / -0

What is the element present in urea

A
C,H,O

B
C,N,O

C
C,N,H

D
C,O,N,H

Solution

C,O,N,H is the element present in urea.
Question 3
1 / -0

The reduction potential of hydrogen half-cell will be negative if :

(1) P(H₂) = 2 atm and [H+] = 2.0 M

(2) P(H₂) = 1 atm and [H+] = 2.0 M

(3) P(H₂) = 1 atm and [H+] = 1.0 M

(4) P(H₂) = 2 atm and [H+] = 1.0 M

A
Option 1

B
Option 2

C
Option 3

D
Option 4

Solution
Question 4
1 / -0

How many moles are there in 140g of Si (atomic mass of silicon is 28)

A
5

B
10

C
28

D
140

Solution

5 moles are there in 140g of Si (atomic mass of silicon is 28).
Question 5
1 / -0

The bleeding of a wound is stopped by the application of ferric chloride because_____

A
Ferric chloride seals the blood vessels

B
Blood starts flowing in the opposite direction

C
Blood reacts and a solid is formed which seals the blood vessels

D
Blood is coagulated and the blood vessels are sealed

Solution

The bleeding of a wound is stopped by the application of ferric chloride because blood is coagulated and the blood vessels are sealed.
Question 6
1 / -0

The outer electron configuration of Gd (Atomic No : 64) is

A
4f⁷5d¹6s²

B
4f³5d⁵6s²

C
4f⁸5d⁰6s²

D
4f⁴5d⁴6s²

Solution

The outer electron configuration of Gd (Atomic No : 64) is4f⁷5d¹6s².
Question 7
1 / -0

Among the given nutrients, milk is a poor source of

A
Calcium

B
Protein

C
Vitamin C

D
Carbohydrates

Solution

Among the given nutrients, milk is a poor source of Vitamin C.
Question 8
1 / -0

How many electrons are there in Na⁺

A
1

B
10

C
11

D
12

Solution

There is 10 electrons in Na+.
Question 9
1 / -0

An atom has 7 electrons in its M - shell and contains 18 neutrons in its nucleus. What is its mass number

A
25

B
27

C
35

D
43

Solution

According to Bohr model, Each shell can occupy 2n² electrons in their orbits where n = 1,2,3.. for K,L,M,..

The atom has 2 electrons in k, 8 electrons in L and 7 electrons in M = 2 + 8 + 7 = 17

And given that its nucleus has 18 neutrons

=> its mass number = number of (electrons + neutrons ) = 17 + 18 = 35
Question 10
1 / -0

A pure substance can only be

A
Compound

B
an element

C
an element or a compound

D
a heterogeneous mixture

Solution

A pure substance can only bean element or a compound.

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Re-Attempt Weekly Quiz Competition

Chemistry Test - 58

Result

Chemistry Test - 58

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SHARING IS CARING

Question 1

A crude form of heroin

A crude form of cocaine

Uranium oxide

Unrefined gold

Solution

Question 2

C,H,O

C,N,O

C,N,H

C,O,N,H

Solution

Question 3

Option 1

Option 2

Option 3

Option 4

Solution

Question 4

5

10

28

140

Solution

Question 5

Ferric chloride seals the blood vessels

Blood starts flowing in the opposite direction

Blood reacts and a solid is formed which seals the blood vessels

Blood is coagulated and the blood vessels are sealed

Solution

Question 6

4f75d16s2

4f35d56s2

4f85d06s2

4f45d46s2

Solution

Question 7

Calcium

Protein

Vitamin C

Carbohydrates

Solution

Question 8

1

10

11

12

Solution

Question 9

25

27

35

43

Solution

Question 10

Compound

an element

an element or a compound

a heterogeneous mixture

Solution

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4f⁷5d¹6s²

4f³5d⁵6s²

4f⁸5d⁰6s²

4f⁴5d⁴6s²