Kerala University 2005 B.E Engineering Entrance - Question Paper

A. NH3
B. PH3
C. H2O
D. H2Se
E. H2S
Ans: D
11. If the absolute temperature of a gas is doubled and the pressure is decreased to 1 half, the
quantity of the gas will
A. Remain unchanged
B. Be doubled
C. Increase fourfold
D. Be halved
E. Be decreased to one-fourth
Ans: C
12. To what temperature must a neon gas sample be heated to double its pressure, if the initial
quantity of gas at 75oC is reduced by 15.0%?
A. 319oC
B. 592oC
C. 128oC
D. 60oC
E. 90oC
Ans: A
13. When electric current is passed through an ionic hydride in molten state
A. Hydrogen is liberated at anode
B. Hydrogen is liberated at cathode
C. No change takes place
D. Hydride ion migrates towards cathode
E. Hydride ion remains in solution
Ans: A
14. The order of 1st ionization energies of the element Li, Be, B, Na is
A. Li > Be > B > Na
B. Be > B > Li > Na
C. Na > Li > B > Be
D. Be > Li > B > Na
E. B > Be > Li > Na
Ans: B
15. The froth-floatation process is based upon
A. The difference in the specific gravity of ore and gangue particles
B. The magnetic properties of gangue and ore
C. Preferential wetting of gangue particles by oil
D. Preferential wetting of ore particles by oil
E. The solubility of ore particles in suitable reagent
Ans: D
16. Which 1 of the subsequent statements is actual for all the alkali metals?
A. Their nitrates decompose on heating to provide NO2 and O2
B. Their carbonates decompose on heating to provide CO2 and the metal oxide
C. They react with oxygen to provide mainly the oxide M2O
D. They react with halogens to provide the halides MX
E. They react with nitrogen to provide nitrides
Ans: D
17. The order of acidic strength of boron trihalides is
A. three 3 three 3 BF < BCl < BBr < BI
B. three 3 three 3 BI < BBr < BCl < BF
C. three 3 three 3 BCl < BBr < BI < BF
D. three 3 three 3 BBr < BCl < BF < BI
E. three 3 three 3 BF < BI < BCl < BBr
Ans: A
18. The carbide which reacts with water to form propyne is
A. CaC2
B. SiC
C. Mg2C3
D. Al4C3
E. Be2C
Ans: C
19. Effective magnetic moment of Sc3+ ion is

Earning:   Approval pending.