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Chemistry - MOST IMPORTANT RRB ALP Previous Year Questions

Practice real questions from previous year exams of RRB ALP.

📘 Matter in Our Surroundings📚 General Facts

Q1

Which of the following statements is incorrect?

🎯 RRB ALP & Tec. (13-08-18 Shift-II)

A.

The particles of matter are in steady state.

B.

Particles of matter are very small.

C.

Particles of matter attract each other.

D.

There are some space between particles of matter.

📘 Solution📚 True Solution

Q2

An Alloy is an example of

🎯 RRB ALP & Tec. (10-08-18 Shift-II)

A.

Colloidal solution

B.

Emulsion

C.

Solid solution

D.

Variety mix

📘 Classification of Matter on the basis of Chemical Properties- I📚 Pure Substance- Compound

Q3

Identify the odd one from the following:-

🎯 RRB ALP & Tec. (17-08-18 Shift-I)

A.

Wind

B.

Alloy

C.

Milk

D.

Water

📘 Chemical Reactions📚 Chemical change

Q4

Which of the following is a chemical change?

🎯 RRB ALP & Tec. (29-08-18 Shift-I)

A.

Souring of Butter

B.

Making of dry ice from CO2

C.

Heating a platinum wire

D.

Iron magnetization

📘 Laws of Chemical Combinations📚 Laws of Definite Proportions

Q5

Who among the following scientists propounded the law of constant ratio?

🎯 RRB ALP & Tec. (30-08-18 Shift-II)

A.

Antoine Lavoisier

B.

Joseph Proust

C.

Robert Boyle

D.

Jacques Charles

📘 Atomicity📚 Polyatomic

Q6

How many atoms are in a molecule of (NH4)2SO4?

🎯 RRB ALP & Tec. (09-08-18 Shift-I)

A.

$\displaystyle 14$

B.

$\displaystyle 15$

C.

$\displaystyle 13$

D.

$\displaystyle 12$

📘 Mole Concept📚 Misc

Q7

What is the percentage amount of carbon in CO2?

🎯 RRB ALP & Tec. (14-08-18 Shift-II)

A.

$\displaystyle 12$

B.

$\displaystyle 44$

C.

$\displaystyle 14$

D.

$\displaystyle 27.3$

📘 Atomicity📚 Misc

Q8

The number of atoms that constitute a molecule is called-

🎯 RRB ALP & Tec. (20-08-18 Shift-II)

A.

atomic number

B.

isotope

C.

atomic mass

D.

atomicity

📘 Mole Concept📚 Molecular Mass

Q9

The atomic mass of nitrogen is 14 and that of hydrogen is 1. What will be the molecular mass of ammonia?

🎯 RRB ALP & Tec. (17-08-18 Shift-II)

A.

$\displaystyle 18$

B.

$\displaystyle 17$

C.

$\displaystyle 16$

D.

$\displaystyle 15$

📘 Mole Concept📚 Number of Particles Calculations

Q10

The mass of a molecule of oxygen is .........?

🎯 RRB ALP & Tec. (20-08-18 Shift-III)

A.

$\displaystyle 2.3$ × $\displaystyle 10$ - $\displaystyle 23$ gram

B.

$\displaystyle 3.3$ × $\displaystyle 10$ - $\displaystyle 23$ gram

C.

$\displaystyle 4.3$ × $\displaystyle 10$ - $\displaystyle 23$ gram

D.

$\displaystyle 5.3$ × $\displaystyle 10$ - $\displaystyle 23$ gram

📘 Mole Concept📚 Mole

Q11

The atomic mass of carbon is 12 and the atomic mass of helium is 4. Which of the following statements is true for 1 mole of each element?

🎯 RRB ALP & Tec. (10-08-18 Shift-I)

A.

$\displaystyle 1$ mole of carbon will have three times more atoms of $\displaystyle 1$ mole of helium.

B.

$\displaystyle 1$ mole of helium will have three times more atoms of $\displaystyle 1$ mole of carbon.

C.

$\displaystyle 1$ mole of carbon will have $\displaystyle 1$ / $\displaystyle 3$ the number of atoms present in $\displaystyle 1$ mole of helium.

D.

$\displaystyle 1$ mole of carbon will have the same number of atoms present in $\displaystyle 1$ mole of helium.

📘 Mole Concept📚 Avogadro's Number

Q12

How many molecules are present in one mole of water?

🎯 RRB ALP & Tec. (21-08-18 Shift-II)

A.

$\displaystyle 6.02$ × $\displaystyle 1026$ Molecules

B.

$\displaystyle 6.02$ x $\displaystyle 1023$ Molecules

C.

$\displaystyle 7.02$ x $\displaystyle 1023$ Molecules

D.

$\displaystyle 8.02$ × $\displaystyle 1022$ Molecules

📘 Mole Concept📚 Mole

Q13

The atomic mass of Sulphur is 32u. What is the number of moles in 16 grams of Sulphur?

🎯 RRB ALP & Tec. (21-08-18 Shift-II)

A.

$\displaystyle 1$ mole of Sulphur

B.

$\displaystyle 0.5$ mole of Sulphur

C.

$\displaystyle 0.75$ mole of Sulphur

D.

$\displaystyle 0.25$ mole of Sulphur

📘 Mole Concept📚 Mole

Q14

What will be the number of moles in 60 grams of Helium (He)?

🎯 RRB ALP & Tec. (29-08-18 Shift-III)

A.

$\displaystyle 25$ moles

B.

$\displaystyle 10$ moles

C.

$\displaystyle 15$ moles

D.

$\displaystyle 12$ moles

📘 Mole Concept📚 Mole

Q15

What is the number of moles present in 540 grams of glucose?

🎯 RRB ALP & Tec. (29-08-18 Shift-III)

A.

$\displaystyle 3$

B.

$\displaystyle 1$

C.

$\displaystyle 2$

D.

$\displaystyle 4$

📘 Pure Substance- Element-Classification of Matter on the basis of Chemical Properties- II📚 Metals and its properties

Q16

Which of the following metals is the most ductile?

🎯 RRB ALP & Tec. (13-08-18 Shift-II)

A.

Ag

B.

Al

C.

Na

D.

Zn

📘 Metallurgy📚 Alloys and Their compositions

Q17

Which of the following is added to make iron hard and strong?

🎯 RRB ALP & Tec. (30-08-18 Shift-I)

A.

Zinc

B.

Copper

C.

Carbon

D.

Sodium

📘 Pure Substance- Element-Classification of Matter on the basis of Chemical Properties- II📚 Metals and its properties

Q18

The most ductile metal is

🎯 RRB ALP & Tec. (31-08-18 Shift-I)

A.

Ph

B.

Au

C.

Ag

D.

C

📘 Pure Substance- Element-Classification of Matter on the basis of Chemical Properties- II📚 Non-metals and its properties

Q19

Non-metal oxides usually are?

🎯 RRB ALP & Tec. (14-08-18 Shift-II)

A.

acidic

B.

amphoteric

C.

neutral

D.

alkaline

📘 Phase Changing Processes and Their Factors📚 Sublimation

Q20

Which of the following can perform sublimation?

🎯 RRB ALP & Tec. (20-08-18 Shift-III)

A.

Ammonium chlorate

B.

Ammonium sulphate

C.

Ammonium chloride

D.

Ammonium sulphide

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