Question: The coloured glassy mass in borax bead test is due to the formation of___________________?

• 1. metal borate
• 2. metal meta borate
• 3. metal boride
• 4. metal silicate

Question: If temperature of gallium arsenide is increased then its conductivity will___________________?

• 1. decrease
• 2. increase
• 3. remains constant
• 4. first decreases then increases

Question: Which of the following will decompose to produce litharge_________________?

• 1. Pb2O
• 2. Pb3O4
• 3. PbO2
• 4. All of the above

Question: Which of the following is metasilicic acid ?

• 1. H2SnO3
• 2. H2SiO3
• 3. H3AsO4
• 4. H3SbO4

Question: Boron in soil has been considered micronutrient for_________________?

• 1. Soil porocity
• 2. Proper growth of plants
• 3. Alkalinity of soil
• 4. All

Question: Substance which is found in dried up lakes of Tibet and California is_______________?

• 1. Tincal
• 2. Boric acid
• 3. Calcium carbonate
• 4. Colemanite

Question: Which of the following does not give Borax bead test ?

• 1. Cu
• 2. Cr
• 3. Ni
• 4. A1

Question: The metal which is used in thermite process because of its activity is____________________?

• 1. iron
• 2. copper
• 3. aluminium
• 4. zinc

Question: Which of the following shows inert pair effect ?

• 1. boron
• 2. carbon
• 3. silicon
• 4. tin

Question: Tincal is a mineral of___________________?

• 1. A1
• 2. Si
• 3. B
• 4. C