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. 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
2. Diamond is chemically
A. a mixture of metal carbonates
B. pure carbon
C. a pure form of sand
D. a mixture of calcium and magnesium phosphates
3. If one mole of ammonia and one mole of hydrogen chloride are mixed in a closed container to form ammonium chloride gas, then
A. there is no relationship
B. DH < Du
C. DH > Du
D. DH = Du
4. Which metal has a greater tendency to form metal oxide?
A. Ca
B. Fe
C. Cr
D. Al
5. 2 g of organic compound on Kjeldahilization liberates ammonia which consumes 30 cm3 of 1 N HCl. The percentage of nitrogen in the organic compound is
A. 30
B. 46.67
C. 35
D. 20.8
6. The function of Fe(OH)3 in the contact process is
A. to remove arsenic impurity
B. to remove moisture
C. to detect colloidal impurity
D. to remove dust particles
7. The percentage of silver still left in the lead layer is approximately
A. 1
B. 3
C. 5
D. 2
8. Which one of the following is a covalent crystal?
A. Quartz
B. Rock salt
C. Dry ice
D. Ice
9. Cooking oil can be converted into vegetable ghee by the process of
A. hydrogenation
B. distillation
C. crystallisation
D. oxidation
10. 1 M HCI is mixed with 200 cm3 of 0.2 M NaOH is
A. 0.292 kJ
B. 3.392 kJ
C. 1.292 kJ
D. 2.292 kJ
11. Which of the following is not nucleofile?
A. Hydrogen peroxide
B. Boron trifluoride
C. Benzoyl chloride
D. Hydrogen sulfide
12. The mass of glucose that should be dissolved in 50 g of water in order to produce the same lowering of vapour pressure as is produced by dissolving 1 g of urea in the same quantity of water is
A. 6 g
B. 3 g
C. 1 g
D. 18 g
13. The general formula of a cycloalkane is
A. CnH2n + 2
B. CnH2n
C. CnH2n - 2
D. CnHn
14. The element not present in fertilisers is
A. nitrogen
B. hydrogen
C. chlorine
D. phosphorus
15. Milk is an example of
A. suspension
B. gel
C. emulsion
D. foam
16. Detergents produce lather with hard water because
A. they are soluble in hard water
B. they are colourless substances
C. the calcium and magnesium salts of sulphonic acids are soluble in water
D. they form sodium carbonate with hard water
17. Carbon cannot reduce Fe2O3 to Fe at a temperature below 983 K because
A. CO is thermodynamically more stable then Fe2O3
B. free energy change for the formation of CO is more negative then that of Fe2O3
C. carbon has higher affinity towards oxygen then iron
D. iron has higher affinity towards oxygen then carbon
18. The temperature of the slag zone in the metallurgy of Iron using blast furnace is
A. 800 - 1000 °C
B. 1500 - 1600 °C
C. 1200 - 1500 °C
D. 400 - 700 °C
19. An ionic compound is expected to have tetrahedral structure if lies in the range of
A. 0.414 to 0.732
B. 0.225 to 0.414
C. 0.732 to 1
D. 0.155 to 0.225
20. The salt will precipitate when the concentration of B- ions is kept
A. between 10-8 M to 10-7 M
B. >10-5 M
C. between 10-7 M to 10-6 M
D. <1O-8 M
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