Atoms

Q.

What does 1 Mole of water molecules has?

Q.

What is the difference in the atomic models of J.J Thomson and Rutherford??

Q. The three basic components of an atom are:

1. Protons, neutrons, and electrons
2. Protons, neutrinos, and ions
3. Protium, deuterium, and tritium
4. Protons, neutrons, and ions

Q. Who is the first person to propose the concept of an atom ?

1. Democritus
2. John Dalton
3. Ernst Rutherford
4. J.J. Thomson

Q. Number of hydrogen atoms in 36 ml of H2o at 277 k are Avogadros number. x is

Q.

Question 3

What is the interparticle force of attraction?

Q.

Ratio of number of atoms in one mole of oxygen molecule to ozone is _____.

1. $\frac{4}{7}$

2. $\frac{2}{3}$

3. $\frac{1}{3}$

4. $\frac{2}{4}$

Q.

What is the ratio of nitrogen and hydrogen in ammonia?

Q.

Who among the following discovered electrons?

1. J.J Thomson

2. Charles Darwin

3. Ernest Rutherford

4. James Chadwick

Q.

In magnesium sulphide, the ratio by mass of Mg and S is 3 :4. What is the ratio of the number of Mg and S atoms ?

Q. The bronze medals are made up of .

1. $Cu$ and $Zn$
2. $Zn$ and $Ni$
3. $Cu$ and $Tn$
4. $Cu$ and $Sn$

Q.

Why can't an atom be further divided?

Q.

Identify the elements present in aluminium chloride.

1. Al , Cl

2. Au, Cl

3. Al, C

4. Ag, Cl

Q.

Question 1.

Write the basic difference in physical properties of the three states of matter.

Q. Water is made up of two hydrogen atoms and one oxygen atom.

1. False
2. True

Q. Which of the following statement is incorrect according to Dalton’s theory?

1. Atoms of the same element are similar in all respect
2. All of these
3. Matter is made up of atoms, which can be subdivided
4. Atom is the smallest particle that can take part in a chemical reaction

Q. Statement 1: An iron rod contains only iron atoms in it.

Statement 2: A glass of water contains only oxygen atoms in it.

1. Both statements are true
2. Both statements are false
3. Statement 1 is true, statement 2 is false
4. Statement 2 is true, statement 1 is false

Q. Alpha rays are made up of positively charged particles.

1. True
2. False

Q.

Determine the total number of atoms present in $7N{H}_3$.

1. Combination reaction

2. Oxidation reaction

3. Exothermic reaction

4. All of the above

Q.

Write the electronic configuration of the following elements.

Na, Mg, Al, and Si.

Q. Analyse the following statements and choose the correct option.

(i) Melamine is a plastic commonly used in kitchenware
(ii) Melamine is a cross-linked polymer just like bakelite
(iii) The effect of heat on melamine is the same as that on PET plastic
(iv) Melamine and Bakelite are good conductors of heat and electricity

1. (i), (ii) and (iv)
2. (i) and (ii)
3. (ii), (iii) and (iv)
4. (i) and (iii)

Q. What will be the chemical formula for aluminium oxide?

1. $Al{O}_3$
2. $A{l}_2{O}_3$
3. $AlO$
4. $A{l}_2{O}_2$

Q. What is quantum
mechanics??

Q.

What are the merits of Dalton’s atomic theory?

1. Explains the laws of chemical combination and distinguishes between atoms and molecules

2. Discovered that electrons are embedded in the positively charged sphere

3. Distinguishes between atoms and molecules

4. Explains the laws of chemical combination

Q.

Give the symbols and the number of atoms in each element present in Zinc chloride.

Q. In the atmosphere, oxygen exists in its diatomic state and not in its monoatomic state.

1. True
2. False

Q.

What will be the decreasing order of intermolecular force of attraction between particles in states of matter?

1. Liquids > Gases > Solids
2. Solids > Liquids > Gases
3. Gases > Liquids > Solids
4. Solids > Gases > Liquids

Q.

___ is the most abundant element in the earth's crust.

1. Carbon

2. Hydrogen

3. Oxygen

4. Nitrogen

Q.

Which of the following pictures represents the arrangement of particles in liquids?

1. Picture II
2. Picture I
3. Picture I and II
4. Picture II and III

Q.

The word atom comes from the word "$atomos$". Who coined this word?

1. John Dalton

2. Antoine Lavoisier

3. J.J Thompson

4. Democritus