311. Oxygen family is ........ group.
(a) 16th (b) 15th
(c) 18th (d) 17th
Answer: (a)
312. Noble gases belong to ....... group:
(a) 18th (b) 17th
(c) 16th (d) 15th
Answer: (a)
313. Which among the following is a metalloid?
(a) Carbon (b) Silicon
(c) Germanium (d) All of these
Answer: (d)
314. The most abundant element in plants:
(a) Oxygen (b) Iron
(c) Carbon (d) Hydrogen
Answer: (c)
315. The constituent of all protein molecules:
(a) Hydrogen (b) Nitrogen
(c) Calcium (d) Iron
Answer: (b)
316. Colour of liquid oxygen:
(a) Yellow (b) Blue
(c) Red (d) Green
Answer: (b)
317. Example of neutral solution:
(a) Chloroform (b) Vinegar
(c) Water (d) Urine
Answer: (c)
318. Chemical property of a substance is determined by:
(a) Protons (b) Neutrons
(c) Electrons (d) None of these
Answer: (c)
319. Raw material for the manufacture of glass:
(a) Sand (b) Clay
(c) Mica (d) Salt
Answer: (a)
320. Which is not a pure metal?
(a) Mercury (b) Gold
(c) Silver (d) Bronze
Answer: (d)
321. Wax is soluble in:
(a) Benzene (b) Water
(c) Alcohol (d) Iodine
Answer: (a)
322. Acid contained in onion:
(a) Oxalic acid (b) Citric acid
(c) Malic acid (d) Prussic acid
Answer: (a)
323. Element obtained from sea weeds:
(a) Chlorine (b) Calcium
(c) Iodine (d) Magnisium
Answer: (c)
324. What is added to gold to make ornaments?
(a) Copper (b) Tin
(c) Lead (d) Aluminium
Answer: (a)
325. Element essential for the functioning of Thyroid gland:
(a) Vanadium (b) Chlorine
(c) Iodine (d) Magnesium
Answer: (c)
326. What is known as ‘Fool’s Gold’?
(a) Iron oxide (b) Iron Pyritis
(c) Silicon dioxide (d) Copper sulphate
Answer: (b)
327. Among the following metal which one will float in water?
(a) Aluminium (b) Zinc
(c) Mercury (d) Sodium
Answer: (d)
328. The gas obtained from cow dung:
(a) Methane (b) Chlorine
(c) Ozone (d) Ammonia
Answer: (a)
329.The most abundant organic compound in nature:
(a) Glucose (b) Cellulose
(c) Sugar (d) Benzene
Answer: (b)
330. The water in which soap does not lather easily because of
the presence of certain
chemicals, known as:
(a) Hard water (b) Heavy water
(c) Contaminated water (d) Soft water
Answer: (a)
331. The rarest element:
(a) Rhodium (b) Platinum
(c) Astastine (d) Radon
Answer: (c)
332. The setting of plaster of Paris involves which among the following process?
(a) Oxidation (b) Dehydration
(c) Reduction (d) None of these
Answer: (a)
333. The glass used to make wind shields of motor vehicles:
(a) Flint glass (b) Safety glass
(c) Pyrex glass (d) None of these
Answer: (b)
334. Alcohol obtained through the .......... of sugar solution is
Ethanol:
(a) Fermentation (b) Reduction
(c) Ionisation (d) None of these
Answer: (a)
335. ...... % Acetic acid is known as Glacial
Acetic acid:
(a) 50 (b) 10
(c) 25 (d) 100
Answer: (d)
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