1. An aqueous solution of copper sulphate is acidic in nature because the salt undergoes [CSE (Pre) 2001]

2. Most of the explosions in mines occur due to the mixing of [CSE (Pre) 2000]

3. Which one of the following is used as an explosive? [CSE (Pre) 2009]

4. With reference to the usefulness of the by-products of sugar industry, which of the following statements is/are correct? [CSE (Pre) 2013. 1. Bagasse can be used as biomass fuel for the generation of energy. 2. Molasses can be used as one of the feedstocks for the production of synthetic chemical fertilizers. 3. Molasses can be used for the production of ethanol. Select the correct answer using the codes given below

5. Which of the following are some important pollutants released by steel industry in India? [CSE (Pre) 2014. 1. Oxides of sulphu. 2. Oxides of nitroge. 3. Carbon monoxid. 4. Carbon dioxide Select the correct answer using the codes given below

6. With reference to ionic compounds, consider the following statements [CSE (Pre) 2003. 1. Ionic compounds are insoluble in alcohol. 2. Ionic compounds in the solid state are good conductor of electricity. Which of these statements is/are correct?

7. Which are the materials generally employed as solder in soldering operations in electronics? [CSE (Pre) 2006]

8. Assertion (A) The main constituent of the liquefied petroleum gas is methane. Reason (R) Methane can be used directly for burning in homes and factories where it can be supplied through pipelines. [CSE (Pre) 2005] Codes

9. Which of the following is/are the characteristic/characteristics of Indian coal? [CSE (Pre) 2013. 1. High ash content. 2. Low sulphur content. 3. Low ash fusion temperature. Chemistry 5.239 Select the correct answer using the codes given below

10. Chlorination is a process used for water purification. The disinfecting action of chlorine is mainly due to [CSE (Pre) 2010]

11. Who among the following discovered heavy water? [CSE (Pre) 2008]

12. Which one among the following is called philosopher's wool? [CSE (Pre) 2007]

13. Consider the following statements [CSE (Pre) 2006. 1. Caffeine, a constituent of tea and coffee is a diuretic. 2. Citric acid is used in soft drinks. 3. Ascorbic acid is essential for formation of bones and teeth. 4. Citric acid is a good substitution ascorbic acid in our nutrition. Which of the statements given above are correct?

14. Which one of the following statements is correct? [CSE (Pre) 2003]

15. Assertion (A) A chemical reaction becomes faster at higher temperature. Reason (R) At higher temperature, molecular motion becomes more rapid. [CSE (Pre) 2000] Codes

16. Assertion (A) In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group. Reason (R) In a group, the atomic radius generally increases from top to bottom. [CSE (Pre) 2003] Codes

17. Directions The following item consist of two statements, one labelled as the 'Assertion (A)' and the other as 'Reason (R)'. You are to examine these two statements carefully and select the answers to these items using the codes given below. Assertion (A) Cellulose is used in making shatterproof glass. Reason (R) Polysaccharides are not soluble in water. [CSE (Pre) 2006] Codes

18. Consider the following chemicals [CSE (Pre) 2006. 1. Benzen. 2. Carbon tetrachlorid. 3. Sodium carbonat. 4. Trichloroethylene Which of the above is/are used as dry cleaning chemical?

19. Which one of the following statements is not correct? [CSE (Pre) 2003]

20. A radioactive substance has a half-life of 4 months. Three fourth of the substance would decay in [CSE (Pre) 2000]

21. Consider the following statements Chlorofluorocarbons known as ozone depleting substances, are used [CSE (Pre) 2012. 1. In the production of plastic foams. 2. In the production of tubeless tyres. 3. In cleaning certain electronic components. 4. As pressurising agents in aerosol cans. Which of the statement(s) given above is/are correct?

22. Which one of the following is not radioactive? [CSE (Pre) 2000]

23. Match List I with List II and select the correct answer using the codes given below the lists. [CSE (Pre) 2000] List I List II A. German silver 1. Tin B. Solder 2. Nickel C. Bleaching powde. 3. Sodium D. Hypo 4. Chlorine Codes A B C D

24. Match List I (fuel gases) with List II (major constituents) and select the correct answer using the codes given below the lists. [CSE (Pre) 2004] List I List II A. CNG 1. Carbon monoxide, hydrogen B. Coal gas 2. Butane, propane C. LPG 3. Methane, ethane D. Water gas 4. Hydrogen, methane, carbon monoxide Codes A B C D

25. Hydrogen fuel cell vehicles produce one of the following as 'exhaust' [CSE (Pre) 2010]