Fill in the blanks by choosing the appropriate word/words from those given in the brackets:
(square pyramidal, electrical, 74; 26, sp3d2, sp3d, chemical, 68, 32, tetrahedral, yellow, white, iodoform, Lucas)
A Galvanic cell converts ______energy into______energy.
Fill in the blanks by choosing the appropriate word/words from those given in the brackets:
(square pyramidal, electrical, 74; 26, sp3d2, sp3d, chemical, 68, 32, tetrahedral, yellow, white, iodoform, Lucas)
The percentage of unoccupied spaces in bcc and fcc arrangements are _______ and _____respectively.
Fill in the blanks by choosing the appropriate word/words from those given in the brackets:
(square pyramidal, electrical, 74; 26, sp3d2, sp3d, chemical, 68, 32, tetrahedral, yellow, white, iodoform, Lucas)
Propan-2-ol on reaction with iodine and sodium hydroxide gives ________ precipitate and the reaction is called ___________ test.
Fill in the blanks by choosing the appropriate word/words from those given in the brackets:
(square pyramidal, electrical, 74; 26, sp3d2, sp3d, chemical, 68, 32, tetrahedral, yellow, white, iodoform, Lucas)
The geometry of XeOF4 molecule is _______ and the hybridisation of Xenon atom in the molecule is ________.
Match the following:
A. Rate constant | (i) Dialysis |
B. Biodegradable | (ii) Glycine |
C. Zwitterion | (iii) Arrhenius equation |
D. Purification of colloids | (iv) PHBV |
Complete the following statements by selecting the correct alternative from the choices given:
During the course of an SN1 reaction, the intermediate species formed is:
a carbocation
a free radical
a carbanion
an intermediate complex
Complete the following statements by selecting the correct alternative from the choices given:
Purification of aluminium by electrolytic refining is called:
Serpeck's process
Hoope's process
Hall's process
Baeyer's process
Complete the following statements by selecting the correct alternative from the choices given:
An aqueous solution of urea freezes at – 0.186°C, Kf for water = 1.86 K kg mo1–1, Kb for water = 0.512 K kg mo1–1. The boiling point of the urea solution will be:
373.065 K
373.0512K
373.186 K
373.512 K
Complete the following statements by selecting the correct alternative from the choices given:
In the dehydration of alcohols to alkenes by heating with concentrated sulphuric acid, the initiation step is:
formation of carbocation
formation of an ester
protonation of the alcohol molecule
elimination of water
Answer the following questions:
Why does the density of transition elements increase from Titanium to Copper? (at. no. Ti = 22, Cu = 29)
Atomic size gradually decreases from left to right across a period of elements. This is because, within a period of elements, all electrons are added to the same shell. However, at the same time, protons are being added to the nucleus, making it more positively charged.
Hence from Ti to Cu as atomic size decreases, the density of the element increases.