Classification of Matter

Q. Which is not a property of an ionic bond?

1. Electron sharing
2. Electron transfer
3. Loss of electrons
4. Gain of electrons

Q.

Nonmetals generally form

1. anions

2. cations

3. ions

4. none of the above

Q. Fill in the blanks.
1. Electron is complete in each hydrogen in a ​

hydrogen molecule.​

2. Sodium chloride is compound while hydrogen​

chloride is compound.​

3. Chlorine (${\mathrm{Cl}}_2$) molecule is formed by
of electrons​ between two chlorine atoms.

Q.

The swimmer is able to cut through water in a swimming pool. Why?

Q. Consider the following figures and the statements underneath.

निम्नलिखित चित्रों तथा इसके नीचे दिये गये कथनों पर विचार कीजिए।



I. H₂ gas will evolve from beaker A.

I. बीकर A से H₂ गैस मुक्त होगी।

II. Solution of beaker B will change red litmus blue as it is acidic in nature.

II. बीकर B का विलयन लाल लिटमस को नीले रंग में परिवर्तित कर देगा क्योंकि यह अम्लीय प्रकृति का होता है।

III. Solution of beaker C will be sulphurous acid which will turn blue litmus red.

III. बीकर C का विलयन सल्फ्यूरस अम्ल होगा जो नीले लिटमस को लाल कर देगा।

IV. No reaction will take place in beaker A.

IV. बीकर A में कोई अभिक्रिया नहीं होगी।

V. Solution of beaker B reacts with carbon to give a gas which burns with a pop sound.

V. बीकर B के विलयन की कार्बन के साथ अभिक्रिया पर एक गैस मुक्त होती है जो पॉप ध्वनि के साथ जलती है।

The incorrect statements are

गलत कथन हैं

1. I, II and III
   
   I, II तथा III
2. II, III and IV
   
   II, III तथा IV
3. III, IV and V
   
   III, IV तथा V
4. I, II and V
   
   I, II तथा V

Q.

Which of the following is/are the reason/s for the reactivity of elements?

1. Tendency to attain noble gas configuration

2. B and C

3. Passing of electric current

4. Change of state

Q.

The elements B [ At. No. 7 ] Have atomic mass 14.

Write the number of protons, number of electrons, and electronic configuration of the element and hence, state whether the elements are noble gases and why.

Q. Which of the following substances does not contain acid?

1. Baking Soda
2. Curd
3. Orange
4. Vinegar

Q. Which of these contains a base?

1. Orange
2. Curd
3. Baking soda
4. Vinegar

Q.

What happens to reactivty coming down a group in each case (from groups1, 2, 13-18)

Q.

State true or false:
Metalloids are highly electropositive.

1. False

2. True

Q.

Which of the following bond/s contain ions?
(i) Ionic bond
(ii) Covalent bond
(iii) Metallic bond

1. (i) and (iii)

2. (ii) and (iii)

3. (i), (ii) and (iii)

4. only (i)

Q. Pick the incorrect option about ionic bond.

1. It contains positive ions and negative ions
2. It contains shared electrons
3. It involves electrostatic interaction
4. It contains electropositive and electronegative elements

Q. All the following statements are true about carbon dioxide except:

1. Its molecular formula is $C{O}_2$
2. Its molecular mass is 44 u
3. Dense than air
4. It always exists as gas

Q.

Why can you smell the perfume of incense stick ?

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Silicon is placed under a seperate category under elements?
Name the category and also the reason for the creation of that category.

Q.

Complete the following electron dot diagrams :

Q. Which of the following tend to gain electrons easily?

1. Electronegative elements
2. Electroneutral elements
3. All of the above
4. Electropositive elements

Q.

Which of the following bonds has a lot of free moving electrons?

1. Ionic
2. Covalent
3. All of the above
4. Metallic

Q. Which is the most electropositive substance among the following?

1. Metals
2. Metalloids
3. Both metals and metalloids
4. Non-metals

Q. During the formation of oxygen $\left({\text{O}}_2\right)$ molecule:

1. one oxygen atom loses electrons.
2. one oxygen atom gains electrons.
3. two oxygen atoms share electrons.
4. ionized oxygen atoms are drowned in a sea of electrons.

Q.

Which of the following is/are the requirements for the formation of the metallic bond?
(i) Formation of negative ions.
(ii) Formation of positive ions.
(iii) Freely moving electrons.
(iv) Sharing of electrons between two atoms.

1. (i) and (ii)

2. (ii) and (iii)

3. (iii) and (iv)

4. (i) and (iv)