Which Oxide of Manganese is amphoteric?
A. MnO2
B. Mn2O3
C. Mn2O7
D. MnO
Submitted by :- Jamil Ahmed
CHEMISTRY
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The purpose of Smelting an ore is to________?
A. Reduce it
B. Oxidize it
C. Obtain an alloy
D. Separate volatile impurities
Submitted by :- Jamil Ahmed
In borax bead test which compound is formed_________?
A. Ortho borate
B. Meta borate
C. Double oxide
D. Tetra borate
Submitted by :- Jamil Ahmed
Percentage of lead in lead pencil is________?
A. Zero
C. 8
B. 2
D. 7
Submitted by :- Jamil Ahmed
Cassiterite is an ore of_______?
Which of the following shows electrical conduction_____?
A. Potassium
B. Graphite
C. Diamond
D. Sodium
Submitted by :- Jamil Ahmed
The type of hybridisation of boron in diborane is______?
A. Sp- hybridisation
B. Sp2- hybridisation
C. Sp3- hybridisation
D. Sp3d2- hybridization
Submitted by :- Jamil Ahmed
Which of the following element has the maximum electron affinity_____?
The structure of H2O2 is_______?
A. Planar
B. Non- planar
C. Spherical
D. Linear
Submitted by :- Jamil Ahmed
A 1 volume solution of H2O2 means_______?
A. 1 grams of H2O2 solution liberate 1 mL of O2 at STO
B. 1 gram equivalents of H2O2 liberates 1 mL of O2 at STP
C. 1 litres of H2O2 liberates 19 mL of O2 at STP
D. 1mL of solution of H2O2 liberates 1 mL of O2 at STP
Submitted by :- Jamil Ahmed