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Browse complete papersThe metal 'X' liberates hydrogen gas with dilute hydrochloric acid, while the metal 'Y' does not liberate hydrogen gas with the same acid. X and Y are respectively
Mg, Al
Zn, Al
Zn, Cu
Cu, Zn
Correct answer
Mg, Al
Identify the pair of oxides which show both acidic as well as basic behaviour.
Na2O,K2O
CuO, FeO
Al2O3, Na2O
ZnO, Al2O3
Correct answer
Na2O,K2O
Match the following
| List-I (Ore formula) | List - II (Name of the ore) | ||
|---|---|---|---|
| a) | Al2O3, 2H2O | i) | Magnetite |
| b) | MnO2 | ii) | Cinnabar |
| c) | Fe3O4 | iii) | Carnallite |
| d) | HgS | iv) | Pyrolusite |
| v) | Bauxite |
The correct answer is:
a - ii, b - iii, c - iv, d - v
a - v, b - iv, c - i, d - ii
a - v, b - iv, c - ii, d - iii
a - iii, b - i, c - ii, d - iv
Correct answer
a - ii, b - iii, c - iv, d - v
An element 'X' reacts with Oxygen and forms a compound with high melting point. This compound also reacts with water. What is 'X'?
C
Fe
Ca
Si
Correct answer
C
Electrolysis of brine liberates a gas 'X' at cathode and gas 'Y' at anode. What are X and Y?
O2, H2
H2, Cl2
H2, F2
CO2, H2
Correct answer
O2, H2
Which type of ores are converted into oxides by heating strongly in the presence of excess air?
Sulphide
Nitrate
Carbonate
Halide
Correct answer
Sulphide
Global Warming is due to
Ozone depletion
Green house effect
UV radiation
Haldane effect
Correct answer
Ozone depletion
Statement I : In plants, the glucose for glycolysis is derived from sucrose.
Statement II : During glycolysis, glucose and fructose are phosphorylated to give rise to glucose-6-phosphate by hexokinase.
Both statements I and Il are true.
Both statements I and Il are false.
Statement I is correct, but statement Il is false.
Statement l is false, but statement Il is true.
Correct answer
Both statements I and Il are true.
Identify the incorrect one:
Platyhelminthes - Flame cells
Nematoda - Renette cells
Annelids - Nephridia
Molluscs - Green glands
Correct answer
Platyhelminthes - Flame cells
Assertion (A) : In a lake ecosystem, fishes are described as nekton.
Reason (R) : They are capable to swim in water.
Both (A) and (R) are correct; (R) is correct explanation for (A).
Both (A) and (R) are correct; (R) is not correct explanation for (A).
(A) is correct and (R) is not correct.
(A) is not correct and (R) is correct.
Correct answer
Both (A) and (R) are correct; (R) is correct explanation for (A).