A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.For each of the following multiple choice questions, choose the most appropriate answer :
1. a-maltose consists of
A. two b-D-glucopyranose units with 1-4 glycosidic linkage
B. two a-D-glucopyranose units with 1-2 glycosidic linkage
C. one a-D-glucopyranose units and one b-D-glucopyranose unit with 1-2 glycosidic linkage
D. two a-D-glucopyranose units with 1-4 glycosidic linkage
2. Gram molecular volume of oxygen at STP is
A. 11200 cm3
B. 3200 cm3
C. 22400 cm3
D. 5600 cm3
3. The correct sequence of steps involved in the mechanism of Cannizzaro's reaction is
A. transfer of H+, nucleophilic attack and transfer of H-
B. electrophilic attack by OH-, transfer of H+ and transfer of H-
C. nucleophilic attack, transfer of H- and transfer of H+
D. transfer of H-, transfer of H+ and nucleophilic attack
4. Out of the given two compounds, the vapour pressure of B at a particular temperature is
A. higher or lower than A depending on the size of the vessel
B. same as that of A
C. higher than that of A
D. lower than that of A
5. Which one of the following is wrongly matched?
A. [Cu (NH3 )4]+2 - square planar
B. [Co (en )3 ]+3 - follows EAN rule
C. [Fe (CN )6]-3 - sp3d2
D. [Ni(CO)4] - neutral ligand
6. Dialysis is used for patients having
A. kidney trouble
B. liver diseases
C. lung trouble .
D. heart diseases
7. Hypo, used in photography, is chemically
A. silver bromide
B. sodium thiosulphate
C. sodium phosphate
D. silver nitrate
8. equilibrium is shifted to the leftCORRECT
A. equilibrium is shifted to the right
B.
C. equilibrium is unaltered
D. reaction rate does not change
9. Carbon, diamond and graphite are together called :
A. isomers
B. allotropes
C. isomorphs
D. isotopes
10. Helium is used in balloons in place of hydrogen because it is
A. radioactive
B. lighter than hydrogen
C. incombustible
D. more abundant than hydrogen
11. The process that does not involve evolution of CO2 is
A. combustion
B. respiration
C. fermentation
D. photosynthesis
12. The product formed when hydroxylamine condenses with a carbonyl compound is called
A. hydrazide
B. hydrazine
C. oxime
D. hydrazone
13. Its de Broglie wavelength is 6.62 ´ 10-35m. Hence x is (h = 6.62 ´ 10-34Js)
A. 0.2 kg
B. 0.15 kg
C. 0.25 kg
D. 0.1 kg
14. Among the following, which is least acidic?
A. p-nitrophenol
B. p-chlorophenol
C. O-cresol
D. phenol
15. For a reaction to be spontaneous at all temperatures
A. DH < DG
B. DG and DH should be negative
C. DG = DS = 0
D. DG and DH should be positive
16. The product obtained reacts with Phenyl hydrazine but does not answer silver mirror test. The possible structure of X is
A. CH3CH2OH
B. (CH3)2CHOH
C. CH3 ¾ ¾ CH3
D. CH3CHO
17. Serpasil is
A. tranquilizer
B. not natural product
C. produced by micro-organisms
D. a mordant dye
18. Methoxy methane and ethanol are
A. Optical isomers
B. Functional isomers
C. Position isomers
D. Chain isomers
19. Mercury is a liquid metal because
A. it has a small atomic size
B. it has a completely filled d-orbital that causes d-d overlapping
C. it has a completely filled s-orbital
D. it has a completely filled d-orbital that prevents d-d overlapping of orbitals
20. The half life time of 1g sample of X is
A. 30 min
B. 15 min
C. 7.5 min
D. 22.5 min
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