NAT II Biological Science Chemistry With Answers

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NAT II Biological Science Chemistry

Sr. # Questions Answers Choice
1 Which one of the halogen acid is a liquid? HF HCl HBr Hl
2 Bromine is obtained on a commercial scale from Caliche Carnallite Common satl Cryolite
3 Dilute hydrochloric acid solution cannot be concentrated by boiling beyond 11% 33% 44% 22%
4 Which of the following halogens does not form its oxyacids? F Cl Br I
5 Which is the most volatile compound? HI HCl HBr HF
6 Sea weeds are important source of Iron Chlorine Iodine Bromine
7 When sulphur is boiled with Na2SO3solution, the compound formed is sodium sulphides Sodiums sulphates Sodium persulphate Sodium thiosulphate
8 Oleum is Castor oil Oil of vitriol Fuming of H<sub>2</sub>SO<sub>4</sub> None of them
9 The number of unpaired electrons in the p-subshell of oxygen atom 1 2 3 4
10 Ozane is not An allotrope A powerful oxidizing agent Paramegnetic a bent molecule
11 Which of the following is acidic? SO<sub>3</sub> N<sub>2</sub>O BeO HgO
12 Which of the following oxides is peroxide? Na<sub>2</sub>O<sub>2</sub> MnO<sub>2</sub> BaO SO<sub>2</sub>
13 Bond angle is minimum for H<sub>2</sub>O H<sub>2</sub>S H<sub>2</sub>Se H<sub>2</sub>Te
14 Hypo is used to photography for Developing picture Picture printed The colour of picture The fixation of picture
15 As a fixing agent in photography, sodium thisoulphate is used for Dissolving out unreacted silver bromide Converting silver halides to metallic silver Reducing solubility of AgBr Preventing overdeveloping and fogging.
16 The acid used in lead storage cells is Phosphoric acid Nitric acid Sulphuric acid Hydrochloric acid
17 Which of the following fluorides does not exist? NF<sub>5</sub> PF<sub>5</sub> AsF<sub>5</sub> SbF<sub>5</sub>
18 Phosphorus pentoxide finds use as An oxidizing agent A reducing agent a bleaching agent A dehydration agent.
19 Red P can be obtained from white P by Heating it with a catalyst in an inert atmosphere Distilling it in an inert atmosphere Dissolving it in CS<sub>2</sub>and crystallzing Melting it and pouring the liquid into water
20 White P when boiled with strong solution of caustic soda produces Phosphine Posh acid Phosphorous acid None
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