Name the following:
The compound formed by the reaction between calcium oxide and silica.
Calcium silicate
Match the following:
|
1.A substance that turns moist starch iodide paper blue |
B.Lead carbonate |
|
3.A solution of this compound gives a dirty green precipitate with sodium hydroxide. |
C.Chlorine |
|
5. A white solid which gives a yellow residue on heating |
E.Ferrous sulphate |
| A. A substance that turns moist starch iodide paper blue | (i) Lead carbonate |
| B. A solution of this compound gives a dirty green precipitate with sodium hydroxide. | (ii) Chlorine |
| C. A white solid which gives a yellow residue on heating | (iii) Ferrous sulphate |
Match the following:
|
Column -A |
Column-B |
|
2. A compound which released a reddish brown gas on reaction with concentrated sulphuric acid and copper turning. |
A. Ammonium sulphate |
|
4. A compound which on heating with sodium hydroxide produces a gas which forms dense white fumes with hydrogen chloride. |
D. Copper nitrate |
| A. A compound which released a reddish brown gas on reaction with concentrated sulphuric acid and copper turning. | (i) Ammonium sulphate |
| B. A compound which on heating with sodium hydroxide produces a gas which forms dense white fumes with hydrogen chloride. | (ii) Copper nitrate |
Choose the correct answer from the choices A, B,C,and D:
The property which is characteristic of an electrovalent compound is that:
It is easily vaporise
It has a high melting point
It is weak electrolyte
It is weak electrolyte
Choose the correct answer from the choices A,B,C and D:
Which of the following hydroxides is not an alkali?
Ammonium hydroxide
Calcium hydroxide
Copper hydroxide
Copper hydroxide
Choose the correct answer from the choices A,B,C,and D.
When a metal atom become an ion
It loses electrons and is oxidised
It gains electrons and is reduced
It gains electrons and is oxidised
It gains electrons and is oxidised
The elements fo one short period of the periodic table are given below in order from left to right:
Li, Be, B,C O F, Ne
i) To which period do these elements belong?
ii) One element of this period is missing which is the missing element and where should it be placed.
iii) Which one of the element in this period shows the property of catenation?
iv) Place the three elements fluorine, beryllium and nitrogen in the order of increasing electronegativity.
v) Which one of the above elements belongs to the halogen series?
