Chemistry - 05
21. Which of the following is a neutral oxide
(A) Calcium oxide
(B) Sulphur-di-Oxide
(C) Nitric oxide
(D) Zinc oxide.
(A) Calcium oxide
(B) Sulphur-di-Oxide
(C) Nitric oxide
(D) Zinc oxide.
Correct Answer: [D] Zinc oxide..
22. Which of the following mixtures can be separated by using separating funnel?
(A) Water + oil
(B) Petrol + kerosene
(C) Water + sugar
(D) Water + milk.
(A) Water + oil
(B) Petrol + kerosene
(C) Water + sugar
(D) Water + milk.
Correct Answer: [A] Water + oil.
23. Mg2+ is isoelectronic with
(A) Zn2+
(B) Cu+
(C) Ca2+
(D) Na+
(A) Zn2+
(B) Cu+
(C) Ca2+
(D) Na+
Correct Answer: [D] Na+.
24. 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 gm
(B) 1.25 gm
(C) 0.125 gm
(D) 5 gm.
(A) 0.0125 gm
(B) 1.25 gm
(C) 0.125 gm
(D) 5 gm.
Correct Answer: [C] 0.125 gm.
25. Brass is an alloy of
(A) Copper and Aluminium
(B) Copper and Zinc
(C) Iron and Copper
(D) Copper and Tin.
(A) Copper and Aluminium
(B) Copper and Zinc
(C) Iron and Copper
(D) Copper and Tin.
Correct Answer: [B] Copper and Zinc.
0 Comments:
Post a Comment