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163321. Which of the following is a neutral oxide
A
Calcium oxideB
Sulphur-di-OxideC
Nitric oxideD
Zinc oxideCorrect Answer: D. Zinc oxide
163422. Which of the following mixtures can be separated by using separating funnel?
A
Water + oilB
Petrol + keroseneC
Water + sugarD
Water + milkCorrect Answer: A. Water + oil
163523. Mg2+ is isoelectronic with
A
Zn2+B
Cu+C
Ca2+D
Na+Correct Answer: D. Na+
163624. The half-life of a substance is 10 days. How much of the substance will be left after 40 days if the initial mass is 2 gm
A
0.0125 gmB
1.25 gmC
0.125 gmD
5 gmCorrect Answer: C. 0.125 gm
163725. Brass is an alloy of
A
Copper and AluminiumB
Copper and ZincC
Iron and CopperD
Copper and TinCorrect Answer: B. Copper and Zinc
163826. Which of the following property is common in Graphite a Diamond?
A
Crystal structureB
DensityC
Electrical conductivityD
Relative atomic weightCorrect Answer: B. Density
163927. In the manufacture of steel by open-hearth process cast iron used has no phosphorus but has manganese as an impurity. The furnace should have a lining of
A
silicaB
lime or magnesiaC
magnesiaD
limeCorrect Answer: A. silica
164028. An alloy contains 20% zinc, 45% nickel and rests aluminum. The total mass in gm of the alloy containing 105 gm of aluminum is
A
250B
300C
170D
200Correct Answer: B. 300
164129. A pair of compounds which cannot exist together in solution is
A
Sodium bicarbonate and sodium carbonateB
Sodium carbonate and sodium sodaC
Sodium bicarbonate and caustic sodaD
Sodium bicarbonate and waterCorrect Answer: C. Sodium bicarbonate and caustic soda
164230. How many gms of a dibasic acid (mol wt 200) should be present in 100 ml of its aqueous solution to give 0.1 (N) strength?
A
10gmB
20 gmC
2 gmD
1 gmCorrect Answer: D. 1 gm
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