ICSE chemistry

Sponsor Area

Question
ICSEENICH12028882

Fill in the blanks by choosing the appropriate word / words from those given in the brackets:

(Raoult’s, Arrhenius, lateral, sodium, magnesium, negative, positive, non-ideal, ideal, iron, copper, van’t Hoff, p- p orbital, ethanol, ethanoic acid, methanoic acid, methanol, propanoic acid.)

(i) For a spontaneous change to take place, the ΔS of the system should be______and ΔG of the system should be________.

(ii) Hydrolysis of methyl propanoate gives______and_______.

(iii) Solutions which strictly obey-law are called__________solutions.

(iv) π bonds are formed by the-overlap of_______orbitals.

(v) Zinc can displace_______from CuSO4 solution, but cannot displace_________from MgSO4 solution.

Solution

positive,negative , Methanol, propanoic acid , Raoult’s ideal , p-p orbital , Cooper, magnesium

Sponsor Area

Question
ICSEENICH12028883

The quantity of electricity required to deposit 1-15g of sodium from molten NaCl (Na = 23, Cl = 35.5) is:

  •  IF

  • 0.5 F

  • 0.05 F

  • 1.5 F

Solution

C.

0.05 F

Question
ICSEENICH12028884

When acetic acid is reacted with calcium hydroxide and the product is distilled dry, the compound formed is:

  • Calcium acetate

  • Acetone

  • Acetaldehyde

  •  Acetic anhydride

Solution

B.

Acetone

Question
ICSEENICH12028885

The [OH-] concentration of a weak base is given by:
  • Ckb

  • square root of straight C k subscript b
  • square root of straight K subscript bevelled straight b over straight c end subscript end root
  • square root of straight K subscript straight b end root

Solution

C.

square root of straight K subscript bevelled straight b over straight c end subscript end root

Question
ICSEENICH12028886

In a plot of log k vs 1 /T, the slope is:

  • - Ea/2.303

  •  Ea/2.303R

  • Ea/ 2.303

  •  - Ea/2.303R

Solution

D.

 - Ea/2.303R