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1. What is the chemical formula of Plaster of Paris? (NTSE Mizoram, Stage-I, 2012-13)
(CaS04)2.H20
(CaS04)3.H2O
(CaS04)2.2H20
CaS04.H20
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2. Choose the correct option from the following. (i) Salt of a strong acid and a strong base are neutral with pH value of 7. (ii) Salt of a strong acid and a weak base are basic with pH value more than 7. (iii) Salt of a weak acid and a strong base are acidic with pH value less than 7.(NTSE Panchkula, Chandigarh, Stage-I, 2012-13)
(i) & (ii) are correct
(ii) & (iii) are correct
Only (i) is correct
(i) & (iii) are correct
3. The pH of solution formed by mixing 40 ml of 0.10 M HCI and 10 ml of 0.45 M of NaOH is (NTSE Panchkula, Chandigarh, Stage-I, 2012-13)
10
12
8
6
4. Match the following. i. Vinegar P. Tartaric acid ii. Orange Q. Oxalic acid iii. Tamarind R. Acetic acid iv. Tomato S. Citric acid (NTSE Panchkula, Chandigarh, Stage-I, 2012-13)
i-Q, ii-R, iii-P, iv-S
i-R, ii-Q, iii-P, iv-S
i-R, ii-S, iii-P, iv-Q
i-S, ii-Q, iii-R, iv-P
5. If the pH of a solution is 8, its [H+] is (NTSE Andhra Pradesh, Stage-I, 2012-13)
log 10-8
108
10-8
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