Chemistry Test

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Chemistry Test - 63

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Weekly Quiz Competition

Question 1
1 / -0

The fundamental particles present in equal numbers in neutral atoms are

A
protons and electrons

B
neutrons and electrons

C
protons and neutrons

D
protons and positrons

Solution

The fundamental particles present in equal numbers in neutral atoms areprotons and electrons.
Question 2
1 / -0

TEL minimise the knocking effect when mixed with petrol, it acts as_______

A
Positive catalyst

B
Negative catalyst

C
Auto catalyst

D
Induced catalyst

Solution

TEL minimise the knocking effect when mixed with petrol, it acts as Negative catalyst.
Question 3
1 / -0

What is the chemical name of the compound

Cu₂CO₃

A
copper (ii) carbonate

B
copper (iii) carbonate

C
copper (i) carbonate

D
copper carbonate

Solution

The chemical name of the compound Cu₂CO₃ is Copper (i) carbonate and is also called as cuprous carbonate.
Question 4
1 / -0

"If a system A is in thermal equilibrium with B and B is in thermal equilibrium with C, then A and C are in equilibrium with each other". This is a statement of

A
Cyclic rute

B
Zeroth law of thermodynamics

C
First law of thermodynamics

D
Second law of thermodynamics

Solution

"If a system A is in thermal equilibrium with B and B is in thermal equilibrium with C, then A and C are in equilibrium with each other". This is a statement of Zeroth law of thermodynamics.
Question 5
1 / -0

A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at :

A
518 nm

B
1035 nm

C
325 nm

D
743 nm

Solution

1 / λ=1 / λ1+1 / λ2

1 / 355=1 / 680+1 / λ2

1 / λ2=(680−355) / (680×355)

⇒ λ2=743nm.
Question 6
1 / -0

Which one of the following can be used to confirm wether drinking water contains a gamma emitting isotope or not

A
Microscope

B
Scintillation counter

C
Lead plate

D
pectrophotometer

Solution

Scintillation countercan be used to confirm wether drinking water contains a gamma emitting isotope or not.
Question 7
1 / -0

The charge on positron is equal to the charge on

A
proton

B
electron

C
alpha- particle

D
neutron

Solution

The charge on positron is equal to the charge on proton.
Question 8
1 / -0

Which of the following are chemical changes?

A) Cooking of Food

B) Digestion of Food

C) Freezing of water

D) Water is heated up

A
A & B

B
A, B & C

C
C & D

D
All the above

Solution

A) Cooking of Food ------ Chemical Change

B) Digestion of Food ----- Chemical Change

C) Freezing of water ----- Physical Change

D) Water is heated up ---- Physical Change

because here the chemical composition of the substance changes in A & B only.

Since we know that, If the chemical composition is changing then it is a chemical change and if the chemical composition is remaining the same, then it is a physical change.
Question 9
1 / -0

Which of the following reactions are exothermic?

(1) C + O₂ → CO₂

(2) 2Mg + O₂ → 2MgO

(3) CuSO₄ + 5H₂O → CuSO₄.5H₂O

(4) All the above

A
1

B
2

C
3

D
4

Solution

Here all the given options are Exothermic reactions. Exothermic reactions are those reactions which involves the release of heat.

Generally all the combining reactions are exothermic in nature.
Question 10
1 / -0

Permanent Hardness of water can be removed by adding

A
Bleaching powder

B
Chlorine

C
Wasshing soda

D
Potassium permanganate

Solution

Permanent Hardness of water can be removed by adding wasshing soda.

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Chemistry Test - 63

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Chemistry Test - 63

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SHARING IS CARING

Question 1

protons and electrons

neutrons and electrons

protons and neutrons

protons and positrons

Solution

Question 2

Positive catalyst

Negative catalyst

Auto catalyst

Induced catalyst

Solution

Question 3

copper (ii) carbonate

copper (iii) carbonate

copper (i) carbonate

copper carbonate

Solution

Question 4

Cyclic rute

Zeroth law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

Solution

Question 5

518 nm

1035 nm

325 nm

743 nm

Solution

Question 6

Microscope

Scintillation counter

Lead plate

pectrophotometer

Solution

Question 7

proton

electron

alpha- particle

neutron

Solution

Question 8

A & B

A, B & C

C & D

All the above

Solution

Question 9

1

2

3

4

Solution

Question 10

Bleaching powder

Chlorine

Wasshing soda

Potassium permanganate

Solution

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