ONE WORD QUESTIONS:
1)Acids have ____ taste.
2)Name the sodium compound used in fire extinguisher.
3)What is milkiness due to when carbon dioxide gas is passed through lime water?
4)What is the colour of phenolphthalein in basic medium?
5)Name the gases produced at the cathode and anode when brine solution is electrolysed.
6)Name the ingredients of baking powder.
7)What is dead burnt plaster?
8)Name the chemical present in egg shell and marbles.
9)Name two olfactory indicators.
10)What is the formula of plaster of paris?
11)Write the formula of the compound used for disinfecting water.
12)What is the formula of copper sulphate before heating and after heating?
13)Is copper sulphate an acidic or basic salt?
14)What could be the pH of Na2CO3 salt solution?
15)Three solutions A,B and C have pH values 8,9 and 10 respectively.Which one of the following will have more concentration of OH- ions ?
16)Out of lime juice and lime water, which is acidic in nature?
17)A compound X reacts with zinc metal to give salt and hydrogen gas. The compound is used in the preparation of soaps.Name the compound X.
18)A dry pellet of a common base , when kept open absorbs moisture and turns sticky. It is also a by-product of chlor-alkali process. Identify the base.
19)Which will have higher concentration of H+ ions in water ? HCl or CH3COOH
20)Name the compound formed when copper oxide dissolves in dil., HCl.
21)Name the product formed when dry slaked lime reacts with chlorine gas.
22)Write the name or formula of the acid and base from which the following salt is formed: CH3COONH4
23)As the pH value increases , the concentration of ______ increases and concentration of ___ decreases.
24)________, made up of _________ is the hardest substance in the human body.
25)When the pH of rain water is less than___ it is called acid rain.
26)What is the formula of sodium zincate?
27)Alcohols and glucose though contain hydrogens do not show acidic characters because they do not ________in water
28)Water soluble bases are called ______
29)A white pluffy powder sets into a hard mass on mixing with water. Name the hard mass so formed.
30)Name the gas formed when sodium hydrogen carbonate is heated.
Answers
Answer:
1. sour
2.sodium bicarbonate
3. When CO2 is passed through lime water, it turns milky due to the formation of calcium carbonate which is insoluble in water. However, when an excess of CO2 is passed through this solution, the milkiness disappears. This is due to the formation of calcium bicarbonate which is colourless and soluble in water.
4. Phenolphthalein is often used as an indicator in acid-base titrations. For this application, it turns colourless in acidic solutions and pink in basic solutions.
5. During electrolysis of brine solution, hydrogen gas (H2) is discharged at the cathode and chlorine gas (Cl2) is discharged at the anode. The solution left behind contains sodium hydroxide (NaOH).
7. When plaster of Paris is heated above 393 K its water of crystallization is lost and the leftover anhydrous calcium sulphate CaSO is called the dead burnt plaster.
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