WorksheetsSunday live group quiz
Total questions: 16
Worksheet time: 32mins
Diamond is one of the hardest known natural substance. An experiment was conducted to test the integrity of diamonds. A 1.2 carat "very good" quality diamond was pressed in a hydraulic press that is capable of delivering 100 ton force. What happened afterwards?
The pressing plate was destroyed
The diamond shattered
A diamond shaped dent formed in the bolster of the hydraulic press
the whole equipment is dismantled under the pressure of the hydraulic press but the diamond remained intact
Consider the molecule of acetic acid. Which of the bonds is associated with the lowest bond energy?
C - C
O - H
C - H
C = O
The following paragraph has many connected points. identify from which statement the lie began, if it is a lie.
(1) While boiling point of compounds is dependent on inter-molecular interactions, melting point has more considerations. (2) Methane has the lowest boiling point among homologous alkanes but not the lowest melting point. (3) Propane has the lowest melting point among homologous alkanes because propane has greater entropy.
1
2
3
All the given statements are true
"Tea is where we explain to each other what we don't understand" - Oppenheimer
From which of the following statements does the paragraph become false?
(1) Methylxanthine are neuro stimulants. The main methylxanthine in tea is caffeine. (2) Other methylxanthines found in tea are two chemically similar compounds, theobromine and theophylline. The tea plant creates these chemicals as a way to ward off insects and other animals. (3) Consuming too much tea causes kidney failure because of caffeine toxicity
1
2
3
all the statements are true
A series of 3 colored glass plates of equal thickness are placed in a light beam. Each sheet absorbs one quarter of the light incident upon it. What is the intensity of the light transmitted by the third glass plate?
1.56%
42.19%
56.25%
75%
The half-life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half-life period of a radioactive substance is one month, then?
it will completely disintegrate in two months
l/8th of it will remain intact at the end of four months
3/4th of it will disintegrate in two months
it will completely disintegrate in four months
We know that entropy of the universe always increases. However, entropy may decrease locally at some region within the isolated system. How can this statement be justified?
It cannot be justified
this is possible because entropy of an isolated system can decrease
it must be compensated by a greater increase of entropy somewhere within the system
The basic principle of chromatographic technique is based on the differential migration of the individual components of a mixture through a stationary phase under the influence of a moving phase. However, Chromatography cannot be used to purify volatile substances.
True
False
Pb3O4 combines with dil. HNO3 to give
Pb(NO3)2 , PbO & H2O
Pb(NO3)4 , PbO2 & H2O
Pb(NO3)4 , PbO & H2O
Pb(NO3)2 , PbO2 & H2O
What element is being reduced?
I2 + H2SO3 + H2O --> 2 HI + H2SO4
I
H
S
O
Monoxides and dioxides of Group 14 elements in the Periodic Table show different acid-base properties. Which is an acidic oxide?
A. GeO
B. PbO
C. SiO2
D. SnO2
Which compound has an ionic bond?
HCl
BeCl2
AlBr3
C6H5NH3Br
The relative masses of the isotopes
The relative abundance of the isotopes
The number of isotopes
The electron configuration of its atoms
What is the best prediction about the physical state and color of Astatine?
Dark black solid
Dark reddish brown liquid
Light yellow gas
Light green gas
Which of the following is the reason behind the unusually high diffusion rate of protons in an electric field relative to other common cations even at room temperature.
Quantum tunneling
Random thermal motion coupled with small size of protons
the formation and concomitant cleavage of covalent bonds through the hydrogen bond network of water molecules
