Molecules

Q.

Vertical columns in the periodic table starting from top to bottom are called __.

Q.

Is water that is H2O is a molecule or a compound sir/mam I have lots of confusion is this single question

Even I can't able to find the answer on Google.......so please the whole answer in detail.....!!

Q.

202. If the valence shell electronic configuration for an element is ns²np⁵, this element will belong to the group of -

1. alkali metals

2. inert metals

3. noble gases

4. halogens

Q.

Which of the following elements are similar in chemical properties?

1. Neon and Chlorine

2. Boron and Gallium

3. Boron and Chlorine

4. Neon and Gallium

Q.

When atoms of different elements join together with an attractive force to form a molecule then this type of molecule is known as?

1. Diatomic molecule

2. Polyatomic molecule

3. Monoatomic molecule

4. Molecule of a compound

Q.

According to IUPAC recommendations, the number of groups in the long form of the periodic table is 18.

1. True

2. False

Q.

What is the atomicity of an ozone molecule?

Q.

Which is more ionic $\mathrm{MnO}\mathrm{or}{\mathrm{Mn}}_2{\mathrm{O}}_7$?

Q.

What is the atomicity of ozone?

1. 0

2. 1

3. 2

4. 3

Q.

What is the chemical formula? What are its characteristics?

Q.

Name the following.

The simplest form of matter that cannot be further broken down using any chemical means

Q.

How is the position of an element in the periodic table related to the number of valence electrons?

Q.

Observe the modern periodic table and explain the graduation in reactivity of halogen family

Q. What is the molecular mass of hydrogen chloride?

1. 35.5 u
2. 37.5 u
3. 37 u
4. 36.5 u

Q. What are actinoids?

Q.

List some difference between an atom or a molecule.

Q.

Ionization energy is directly proportional to the atomic radius and the effective nuclear charge.

1. True

2. False

Q.

Atomic numbers of elements P, Q, R and S are 1, 2, 7 and 11 respectively. Classify them as metals, non-metals and noble gases.

Q.

A molecule can have only similar kind of atoms.

1. True

2. False

Q. Which among the following options is not true about molecules?

1. Molecules are indivisible particles.
2. Molecules can exist independently.
3. Molecules are formed by the combination of two or more atoms.
4. Atoms combine in a fixed ratio to form a molecule.

Q.

Which of the following exhibit the weakest intermolecular forces?

1. He

2. NH₃

3. H₂O

4. HCl

Q.

Atoms always combine to form a ----------------

Q. What is electropositivity ?what do you think will happen if a highly elecropositive element bonded to another element of high electronegativity?

Q. What is electropositivity? what do you think will happen if a highly electropositive element bonded to another element of high electronegativity?

Q.

Explain the electrovalency in: (c) Magnesium

Q. Which of the following elements will have highest second ionisation enthalpy?

1. $1s^2$ $2s^2$ $2p^6$ $3s^2$
2. $1s^2$ $2s^2$ $2p^6$ $3s^1$
3. $1s^2$ $2s^2$ $2p^6$ $3s^2$ $3p^2$
4. $1s^2$ $2s^2$ $2p^6$ $3s^2$ $3p^3$

Q.

As the s-character of hybridized orbital decreases, the bond angle also decreases.

1. Decreases

2. Increases

Q.

The element with the highest electron affinity among the halogens is

1. $\mathrm{F}$

2. $\mathrm{Cl}$

3. $\mathrm{Br}$

4. $\text{I}$

Q. Elements belonging to the same group of periodic table have :

1. same number of valence electrons
2. same number of energy levels
3. same number of electrons
4. same ionisation enthalpy

Q.

Which among the following is not true about modern periodic table (a) group number of an element gives an idea of the numbers of its valence electrons (b) non metals are present towards the right side of the periodic table (c) hydrides of the elements in the first group will have a similar formula (d) oxides of elements in the first period will have a similar formula