Glass
Trending Questions
Glass is a mixture of silicates.
True
False
Reaction of copper with chlorine.formation of copper chloride
- True
- False
Greenish layer appears on the copper utensils if they are not cleaned for a few days.
False
True
- False
- True
Painting a wooden block or wall is a chemical change or not as there is a change in colour?
Zinc carbonate is heated. The colour of its residue on cooling is
White
Yellow
Blue
Black
- True
- False
The constituents used in the manufacturing of different types of glasses are given below.
Silica(SiO2), Sodium Carbonate (Na2CO3), Calcium Carbonate (CaCO3), Potassium Carbonate(K2CO3), Boron Oxide (B2O3), Alumina (Al2O3) and Lead Oxide (PbO)
Choose the option/s that correctly matches the constituents and its use.
SiO2, Na2CO3 and CaCO3⇒ Used in soft glass
SiO2, Al2O3 and CaCO3⇒Used in Borosilicate glass
SiO2, K2CO3 and PbO⇒Used in optical glass
SiO2, K2CO3 and B2O3⇒ Used in hard glass
- True
- False
Copper carbonate is heated. The colour of its residue on cooling is
Yellow
Blue
Black
White
- Gas
- Amorphous solid
- Brittle
- Made of CaCO2
The number of free electrons per unit volume is more in
glass
graphite
iron
pure water
- Green glass- Chromium ions
- Yellow glass- Ferrous ion
- Blue Glass- Cobalt chloride
- Purple glass- Manganese dioxide
- Opaque
- Transparent
- Electrical insulator
- Crystalline
- True
- Flase
Lead carbonate is heated. The colour of its residue on cooling is
White
Yellow
Blue
Black
- paper chromatography
- fluid chromatography
- plasma chromatography
- distilled chromatography
- True
- Flase
- Iron
- Chromium
- Cobalt
- Nickel
- Decomposition of the solution
- Filtration of the solution
- Evaporation of the solution
- Distillation of the solution
- True
- False
The different pigments from an extract of flower petals
- False
- True
Four students, (A), (B), (C) and (D) observed the colour and solubility of Iron, Sulphur and Iron Sulphide in Carbon Disulphide. The tick mark (✔) represents soluble, and the cross mark (✕) represents insoluble, in Carbon Disulphide. Their observations are tabulated below.
Student | Colour | Solubility in Carbon Disulphide () | ||||
(A) | Yellow | Silvery | Greyish silver | (✔) | (✕) | (✔) |
Silvery | Orange | Reddish-brown | (✕) | (✔) | (✔) | |
(B) | ||||||
(C) | Grey | Yellow | Greyish black | (✕) | (✔) | (✕) |
(D) | Silvery | White | Silvery white | (✔) | (✕) | (✕) |
(A)
(B)
(C)
(D)
- analyze metal ions
- to test water for pollution
- analyze organic compound
- all of the above