Native State

Q.

Give the names and formulae of ores of zinc?

Q.

Name the seventeen rare earth minerals.

Q. Calamine and Malachite respectively , are the ores of :

1. Aluminium and Zinc
2. Zinc and Copper
3. Copper and Iron
4. Nickel and Aluminium

Q.

Name the metal which can be extracted from Haematite.

Q.

Bauxite contains _____ percent of aluminium.

1. 30-40

2. 30-50

3. 30-70

4. 25-75

Q. Match the list I and II and pick the correct matching from the codes given below.

	List I (Metals)		List II (Ore)
(A)	Aluminium	(1)	Bauxite
(B)	Copper	(2)	Dolomite
(C)	Potassium	(3)	Pyrites
(D)	Magnesium	(4)	Pitchblende
(E)	Radium	(5)	Sylvine

1. $A-4,B-5,C-2,D-1,E-3$
2. $A-1,B-3,C-4,D-5,E-2$

3. $A-1,B-3,C-4,D-2,E-5$

4. $A-1,B-3,C-5,D-2,E-4$

Q.

Which of the following point is not true about enthalpy of atomization regarding transition metals?

1. They have high enthalpies of atomization

2. Transition metals of the second and third series have greater enthalpies of atomisation than the corresponding elements of the first series.

3. Metals with very high enthalpy of atomisation tend to be noble in their reactions

4. Transition metals of the second and third series have lower enthalpies of atomisation than the corresponding elements of the first series.

Q.

The ore zinc blende is an important source of metal zinc. What is the zinc compound in the zinc blende?

Q.

Silicon is an important constituent of

1. chlorophyll

2. haemoglobin

3. rocks

4. amalgams

Q.

What is the composition of Siderite?

Q.

Alchemy aimed at finding………which was considered mythical and magical substance.

1. Philosophers Stone

2. Gold

3. Silver

4. Zinc

Q. One of the rectangular components of force of 40 N is 20N. Find the angle it makes with this component?

Q.

What Are Transition Metals?

Q. Iron is not found naturally in the form of the free metal. Gold can be found naturally as the free metal. Explain.

Q. The one that is not a magnesium ore is:​

1. Kieserite
2. Magnesite
3. Argen
4. None of the above

Q. RCC is:

1. the concrete having an iron framework inside it as a support
2. the crushed cement in which more gravel is added
3. none of the above
4. prepared by adding calcium chloride to the limestone and calcium silicate

Q. Which of the following metal occurs in native state?

1. Ca
2. Au
3. Zn
4. Al

Q. Match the types of defects given in Column I with the statement given in Column II.

$\begin{array}{cccc}& columnl& & Columnll\\ \left(A\right)& Impuritydefect& \left(i\right)& NaclwithanionicsitescalledF-centres\\ \left(B\right)& Metalexcessdefect& \left(ii\right)& FeOwithf{e}^{3+}\\ \left(C\right)& Metaldeficiencydefect& \left(iii\right)& NaClwithS{r}^{2+}andsomecationicsitesvacant\end{array}$

Q.

For each substance listed below explain its significance in the extraction of aluminium

(a) Bauxite

Q. ZnS and PbS are separated by using?

Q. Which of the following metal is sometimes found native in nature?

1. Aluminium
2. Copper
3. Sodium
4. Magnesium

Q.

Write one typical use of the following:

Gold

Q. Elements found in native state are

1. Pb and Bi as they are in p-block
2. Hg and Os as they are in liquid state
3. C and Si as they are non-metals
4. Pt and Au as they are at the bottom of the electrochemical series

Q. Silicon is the main constituent of _______.

1. alloys
2. rocks
3. animals
4. vegetables

Q. Gold does not occur in the combined form. It does not react with air or water. It is in the_______state.

1. native
2. combined
3. original
4. liquid

Q. In which of the following minerals, aluminium is not present?

1. Cryolite
2. Mica
3. Feldspar
4. Fluorspar

Q. Which of the following metal is present in native state?

1. platinum
2. iron
3. copper
4. potassium

Q. A number of elements are available in earth's crust but most abundant elements are _______.

1. $Al$ and $Fe$
2. $Fe$ and $Cu$
3. $Cu$ and $Ag$
4. none of these

Q. Assertion :Iron is found in the free state in nature. Reason: Iron is highly reactive element.

1. If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
2. If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3. If Assertion is correct but Reason is incorrect.
4. If Assertion is incorrect but Reason is correct.

Q. Assertion :Gold occurs in native state. Reason: Gold dissolves in aqua-regia.

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. Assertion is incorrect but Reason is correct