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. 023 g of sodium metal is reacted with 100 cm3 of water. The pH of the resulting solution is
A. 11
B. 9
C. 10
D. 12
2. The acid that 'can be used as a hypnotic is
A. tartaric acid
B. benzoic acid
C. barbituric acid
D. butanoic acid
3. For one mole of an ideal gas, increasing the temperature from 10°C to 20°C
A. increases the average kinetic energy by two times.
B. increases the rms velocity by times.
C. increases both the average kinetic energy and rms velocity, but not significantly.
D. increases the rms velocity by two times.
4. 2 N HCl is titrated against 0.1 N NaOH solution. The titration was discontinued after adding 50 cm3 of NaOH. The remaining titration is completed by adding 0.5 N KOH. The volume of KOH required for completing the titration is
A. 21.0 cm3
B. 10 cm3
C. 12 cm3
D. 16.2 cm3
5. 06 mole of KNO3 solid is added to 100 cm3 of water at 298 k. The enthalpy of KNO3aq solution is 35.8 kJmol-1. After the solute is dissolved the temperature of the solution will be
A. 304 k
B. 298 k
C. 293 k
D. 301 k
6. Entropy of the universe is
A. continuously increasing
B. continuously decreasing
C. zero
D. constant
7. pH value of which one of the following is not equal to one?
A. 0.05 M H2SO4
B. 0.1 M CH3 COOH
C. 0.1 M HNO3
D. 50cm3 of 0.4 M HCI +50 cm3 of 0.2M NaOH
8. The acid present in lemons and oranges is
A. acetic acid
B. hydrochloric acid
C. citric acid
D. oxalic acid
9. Sodium hydroxide solution 2g/100 ml is
A. 0.2 molar solution
B. 0.5 molar solution
C. 1 molar solution
D. 2 molar solution
10. At pH = 4 glycine exists as
A. H2N - CH2 - COO-
B. H3 - CH2 - COO-
C. H3- CH2 - COO-
D. H2N - CH2 - COOH
11. In vulcanisation, natural rubber is heated with :
A. Carbon
B. Sulphur
C. Silicon
D. Phosphorus
12. PVC plastics are obtained from vinyl chloride by the process of
A. cracking
B. polymerization
C. reduction
D. distillation
13. This is because
A. O2 and Xe have comparable ionisation energies
B. O2 and Xe have comparable sizes
C. O2 and Xe have comparable electronegativities
D. both O2 and Xe are gases
14. The substance whose aqueous solution would be a conductor of electricity than water is
A. cane sugar
B. glucose
C. common salt
D. ethyl alcohol
15. The compound obtained when acetaldehyde reacts with dilute aqueous sodium hydroxide exhibits
A. geometric isomerism
B. both optical and geometric isomerism
C. neither optical nor geometric isomerism
D. optical isomerism
16. The incorrect match is
A. Silk - Polyamide
B. Indigo - Azo dye
C. Lipase - Enzyme
D. Kerati - Protein
17. Diamond is the harder than graphite because of :
A. difference of layers of atoms
B. tetrahedral structure of diamond
C. difference of crystalline structures
D. none of these
18. The reaction C2H5ONa + C2H5I ® C2H5OC2H5 + NaI is known as
A. Wurtz's synthesis
B. Williamson's synthesis
C. Kolbe's synthesis
D. Grignard's synthesis
19. equilibrium is shifted to the leftCORRECT
A. equilibrium is shifted to the right
B.
C. equilibrium is unaltered
D. reaction rate does not change
20. An example for autocatalysis is
A. oxidation of NO to NO2
B. oxidation of oxalic acid by acidified KMnO4
C. decomposition of KClO3 to KCl and O2
D. oxidation of SO2 to SO3
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