Combined State

Q. Among the following ores Bauxite, Siderite, Cuprite, Calamine, Haematite, Kaolinite, Malachite, Magnetite, Sphalerite, Limonite, Cryolite, the number of principal ores of iron is ______

Q.

Which of the following is an oxide ore?

1. Bauxite

2. Cuprite

3. Haematite

4. All of these

Q. Match List-1 with List -II:
$\begin{array}{cc}\text{List-I}& \text{List-II}\\ \left(A\right)\text{Sphalerite}& \left(I\right)FeC{O}_3\\ \left(B\right)\text{Calamine}& \left(II\right)PbS\\ \left(C\right)\text{Galena}& \left(III\right)ZnC{O}_3\\ \left(D\right)\text{Siderite}& \left(IV\right)ZnS\end{array}$
Choose the most appropriate answer from the options given below:

1. $\left(A\right)-\left(IV\right),\left(B\right)-\left(I\right),\left(C\right)-\left(II\right),\left(D\right)-\left(III\right)$
2. $\left(A\right)-\left(III\right),\left(B\right)-\left(IV\right),\left(C\right)-\left(II\right),\left(D\right)-\left(I\right)$
3. $\left(A\right)-\left(IV\right),\left(B\right)-\left(III\right),\left(C\right)-\left(II\right),\left(D\right)-\left(I\right)$
4. $\left(A\right)-\left(II\right),\left(B\right)-\left(III\right),\left(C\right)-\left(I\right),\left(D\right)-\left(IV\right)$

Q.

Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential value has a positive sign

a) Fe(Z=26) b) Co(Z=27) c) Ni(Z=28) d) Cu(Z=29)

Q. The most abundant metal in the earth crust is:

1. Copper
2. Silver
3. Aluminium
4. Silicon

Q.

The main ore used for the extraction of iron is:

1. Haematite

2. Calamine

3. Bauxite

4. Cryolite

Q. What is the role of zinc metal in the extraction of silver?

Q.

For the extraction of aluminium answer the following

a. Name one chief ore of aluminium

Q.

which element is rarest in the world

Q. Uranium on reaction with water forms

1. Uranium dioxide and oxygen
2. Uranium dioxide and uranium hydride
3. Only uranium dioxide
4. Uranium dioxide and uranium oxide

Q. Most abundant metal in earth crust is___________.

1. Al
2. O
3. Si
4. Fe

Q.

A compound contains one $\mathrm{Ca}$, two $\mathrm{O}$ and two $\mathrm{H}$ atoms in its molecule.

The compound is

1. An acid

2. A base

3. A salt

4. None of these

Q. {Sulphate of a metal M (having amphoteric oxide) reacts with sodium hydroxide to form a white gelatinous precipitate. The chemical formula of the precipitate and metal M respectively is a)Cu{(OH)}_2 , Cu} b) Na_2ZnO_2 , Zn c) CuO, Cu d)Zn{(OH)}_2 , Zn

Q. Match the following:

(i) Biodegradeable polymer	(p) 3-hydroxybutanoic acid
(ii) Bakelite	(q) Phenol
(iii) Neoprene	(r) 2-chlorobuta-1, 3-diene
(iv) Glyptal	(s) phthalic acid

1. $\left(i\right)-\left(q\right);\left(ii\right)-\left(p\right);\left(iii\right)-\left(r\right);\left(iv\right)-\left(s\right)$
2. $\left(i\right)-\left(p\right);\left(ii\right)-\left(q\right);\left(iii\right)-\left(r\right);\left(iv\right)-\left(s\right)$
3. $\left(1\right)-\left(s\right);\left(ii\right)-\left(r\right);\left(iii\right)-\left(p\right);\left(iv\right)-\left(q\right)$
4. $\left(1\right)-\left(p\right);\left(ii\right)-\left(q\right);\left(iii\right)-\left(s\right);\left(iv\right)-r)$

Q.

What are the properties of Hydrogen peroxides?

Q.

Malachite is an ore of:

1. Both magnesium and calcium

2. Copper

3. Magnesium

4. Calcium

Q. A solution is a homogeneous mixture of two or more substances. Which of the following is a solution?

1. Milk
2. Smoke
3. Brass
4. Face Cream

Q. In chromite ore, the oxidation number of iron, and chromium are respectively.

1. +3, +6
2. +2, +3
3. +2, +6
4. +3, +2

Q.

Which of the following does not react with oxygen directly?

Zn, Ti, Pt, Fe

Q. Which one is the following ores is best concentrated by froth floatation method?

Q. Zinc is used to extract silver by solvent-extraction from molten lead by:

1. Solvay process
2. Hall-Heroult process
3. Parkes process
4. Mond process

Q. Alloy is an example of:

1. Colloidal solution
2. Heterogenous solution
3. Emulsion
4. Solid solution

Q. Antimony is found mainly as:

1. Phosphide mineral
2. Chloride mineral
3. Sulphide mineral
4. Sulphate mineral

Q. Composition of azurite mineral is:

1. $Cu(HC{O}_3{)}_2.Cu(OH{)}_2$
2. $CuC{O}_3.CuO$
3. None of these
4. $2CuC{O}_3.Cu(OH{)}_2$

Q.

Sulphide ores are usually dressed by the froth floatation process. Why?

Q. Uranium hydride on reaction with water forms

1. Only uranium dioxide
2. Uranium trioxide and hydrogen gas
3. Uranium oxide and hydrogen gas
4. None of the above

Q. ______ is the most abundant element in the earth's crust.

Q. The method of extraction of silver by cyano complex formation followed by metal displacement is called as:

1. Parke's method
2. MacArthur-Forest method
3. Serpeck method
4. Hall's method

Q. Natron is a mineral whose formula represented by:

1. $N{a}_{2}C{O}_3.H_{2}O$
2. $N{a}_{2}C{O}_3.10H_{2}O$
3. $N{a}_{2}S{O}_4.H_{2}O$
4. $N{a}_{2}S{O}_4.7H_{2}O$

Q. Match the following :