1
TS EAMCET 2020 (Online) 11th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

When orthoboric acid $\left(\mathrm{H}_3 \mathrm{BO}_3\right)$ is subjected to strong heating, the residue left is

A

diborane

B

boron

C

boric anhydride

D

borax

2
TS EAMCET 2020 (Online) 11th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

When graphite is heated at $300^{\circ} \mathrm{C}$ with potassium vapour, it forms $\mathrm{C}_8 \mathrm{~K}$ compound that shows one of the following property.

A

Conducting and diamagnetic

B

Non-conducting and diamagnetic

C

Conducting and paramagnetic

D

Non-conducting and paramagnetic

3
TS EAMCET 2020 (Online) 11th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

How many bridging oxygen atoms are present in $\mathrm{P}_4 \mathrm{O}_{10}$ ?

A

4

B

5

C

6

D

2

4
TS EAMCET 2020 (Online) 11th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

Ozone is obtained from oxygen

A

by oxidation at high temperature

B

by oxidation using a catalyst

C

by silent electric discharge

D

by conversion at high pressure

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