Multiple Bond Formation

Q.

What is the common oxidation state for Sulfur?

Q.

Which has maximum bond energy?

a)Cl₂ b)Br₂ c)F₂ d)I₂

Q.

The oxidation number of potassium in K₂O K₂O₂ and KO₂ respectively is

Q.

Among the following hydrides of group 15 elements, the most stable hydride is:

1. PH₃

2. SbH₃

3. NH₃

4. AsH₃

Q. The element that shows greater ability to form $p\pi -p\pi$ multiple bonds, is

1. Si
2. Ge
3. Sn
4. C

Q. Crude sodium chloride contains impurities of:

1. $N{a}_{2}S{O}_4\text{only}$
2. $N{a}_{2}S{O}_4\text{and}CaC{l}_2\text{only}$
3. $MgC{l}_2\text{only}$
4. $N{a}_{2}S{O}_4,CaC{l}_2,CaS{O}_4\text{and}MgC{l}_2$

Q.

Which of the following crystalline solids have highest melting point?

1. ice

2. diamond

3. sulphur

4. zinc

Q. Lithium resembles magnesium in some of its properties. Mention two such properties and give reasons for this resemblance.

Q.

Whether noble gas have charge or not and oxidation number is zero? Why? and give reasons?

Q. Why do interstial compounds have higher melting points?

Q. +2 oxidation state of lead is more stable than + 4, because of

1. Presence of vacant orbitals
2. Octet configuration
3. Inert pair effect
4. Penetration power

Q.

What are organometallic compounds

Q. Explain two properties of carbon:
(i) Catenation
(ii) Tetravalency

Q.

Which transition element exhibits all the oxidation states from +2 to +7?

1. Fe

2. Sc

3. Mn

4. Ti

Q. Which of the following group 14 elements shows maximum tendency towards catenation?

1. lead
2. germanium
3. silicon
4. carbon

Q.

Statement A: Magnesium and Magnesium ions have the same number of electrons.

Statement R: Magnesium and magnesium ions have same nuclear charge.

1. If A and ‘R’ are true and R is the correct reason for A.

2. If A and ‘R’ are true but R is not the correct reason for A.

3. If A is correct and R is wrong.

4. If A is wrong and ‘R’ is correct.

Q.

A compound contains only one type of atom.

1. True
2. False

Q. Iron reacts with carbon to form iron oxide and carbon dioxide.

1. True
2. False

Q.

When petroleum is heated, the vapor contain mainly

1. Diesel

2. Petroleum ethane

3. Machine oil

4. Kerosene

Q. Derive the packing fraction of Diamond

Q. Assertion :Enthalpy of graphite is lower than that of diamond. Reason: Entropy of graphite is lower than that of diamond.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Why do we get a meso compound on addition of bromine to trans -2-butene rather than enantiomers?

Q. Why in [ Co(NH3)6]3-ammonia act as a strong ligand

Q. Colour is imparted to glass by mixing

1. dyes
2. Metal oxide
3. oxides of non metal
4. Coloured salts

Q. How to find oxidation state of central metal atom in brige complex

Q.

Which of the following species is not expected to be a ligand?

1. $CO$
2. $N{H}_4^{+}$
3. $NO$
4. $N{H}_{2}C{H}_{2}C{H}_{2}N{H}_2$

Q. Inert pair effect is shown by how many elements?

Q. Zn and S are heated to form zinc sulphide. If 12 g of Zn is heated with 7.5 g of S, the amount of product formed is (molar mass of Zn = 65, S = 32):

1. 
2. 
3. 
4. 

Q.

What is meant by catenation? Name two elements which show the property of catenation.

Q. Explain why carbon forms covalent bond? Given two reasons for carbon forming a large number of compounds.