Silicates

Q.

Reaction between Ammonium Chloride and Barium hydroxide is_______.

Q. Pyrosilicate ion is:

1. $S{i}_2{O}_4^{4-}$
2. $S{i}_2{O}_7^{6-}$
3. $S{i}_2{O}_2^{6-}$
4. $S{i}_2{O}_2^{7-}$

Q.

Describe the permutit process for softening hard water.

Q. In the hexagonal close packing , why the contribution of each corner atom is 1/6?

Q. What is the number of atoms in 20 g of SO3 ?

Q. What is the coordination number for a close packing in 1-D lattice?

1. 2
2. 4
3. 12
4. 0

Q.

If 31g of $P_4$ is reacted with excess oxygen, the percentage yield is 60%, then the amount of product formed is?

Q.

Explain how camphor disappears without leaving any residue.

Q. Formal charge on S atom in sulphuric acid is

1. -1
2. 0
3. 2
4. 1

Q. The formula of cyclic silicate in which 6 tetrahedra are arranged cyclically is:

1. $S{i}_6{O}_{18}^{12-}$
2. $S{i}_6{O}_{18}^{6-}$
3. $S{i}_6{O}_6^{2-}$
4. $S{i}_4{O}_{18}^{6-}$

Q. The basic structural unit of ortho-silicates is :

1. $Si{O}_4^{4-}$
2. $Si{O}_3^{2-}$
3. $Si{O}_4^{2-}$
4. SiO

Q.

Eggshell is made up of a chemical. In which of the two ores this chemical is present?

1. Limestone: CaCO_3​, Dolomite: CaCO₃.MgCO₃

2. Limestone: CaCO₃.MgCO₃​, Dolomite: CaCO₃

3. Limestone: Ca₂CO₃, Dolomite:Ca₂CO₃.MgCO₃

4. None of these

Q. Name of the structure of silicates in which four oxygen atoms of $[Si{O}_4{]}^{4-}$ are shared is

1. Pyrosilicate
2. Sheet silicate
3. Linear chain silicate
4. Three dimensional silicate

Q. Which of the following statement(s) is/are correct regarding trigonal crystal system?

1. It is also called as rhombohedral crystal system.
2. All the edge lengths or axial lengths are equal.
3. All three axial angles are equal but they are not equal to ${90}^o$
4. All of the above.

Q.

What is collodion?

Q.

${\mathrm{R}}_2\mathrm{Si}{\left(\mathrm{OH}\right)}_2$ on polymerization gives:

Q. in any ionic crystal as formed cubical close packing and b atoms are present at every tetrahedral voids if any sample of crystals contain N number of atoms then number of A atoms in that samples

Q. Most crystals show good cleavage because their atoms, ions or molecules are:

1. Weakly bonded together
2. Strongly bonded together
3. Spherically symmetrical
4. Arranged in planes

Q. Which one of the following group represent 2-D silicate?

1. $Si{O}_4^{4-}$
2. $(S{i}_2{O}_5{)}_n^{2n-}$
3. $S{i}_2{O}_7^{6-}$
4. $(Si{O}_3{)}_n^{2n-}$

Q. The value of $n$ in the molecular formula $B{e}_{n}A{l}_{2}S{i}_6{O}_{18}$ is:

Q.

Why is ethylene glycol used as anti-freeze?

Q. The overall charge present on the cyclic silicate anion $[S{i}_6{O}_{18}{]}^{n-}$ is:

1. -12
2. -18
3. -6
4. -24

Q. The general formula of double chain silicates is:

1. $Si{O}_4^{4-}$
2. $S{i}_3{O}_9^{2-}$
3. $S{i}_2{O}_7^{6-}$
4. $(S{i}_4{O}_{11}{)}_n^{6n-}$

Q. Which of the following is/are the incorrect statement about silicones?

1. They are made up of $S{i}_4^{4-}$ units
2. They are polymers made up of $R_{2}SiO$ units
3. They are water soluble compounds.
4. They are hydrophilic in nature

Q. Which of the following is incorrect about anionic unit of pyrosilicate?

1. The O/Si ratio is 3.5 : 1
2. It has one oxygen shared between two $Si{O}_4$ tetrahedra
3. Negative charge is present on Si atom
4. All of the above.

Q.

20) The chemical name of sand is

1. Silicon

2. Sodium silicate

3. Silicon dioxide

4. Calcium silicate

Q. The structure of silicates in which three oxygen atoms of $[Si{O}_4{]}^{4-}$ are shared is :

1. Pyrosilicate
2. Sheet silicate
3. Linear chain silicate
4. Three-dimensional silicate

Q.

Slag is a product of

1. coke and metal oxide

2. flux and coke

3. metal and flux

4. flux and impurities

Q.

A compound formed by elements X & Y, Crystallizes in a cubic structure, where X is at the corners of the cube and Y is at six face centers. If side length is 5 Å, the density of the solid is (atomic weight of X and Y as 120 and 210 respectively).

1. 2.8 g.cm³

2. 10 g.cm³

3. 8.6 g.cm³

4. 12.8 g.cm³

Q.

Which compound is known as water glass