Chemistry MCQS

741. 2 grams of oxygen contain the number of molecules equivalent to that in:
A. 0.5 g of hydrogen
B. 4 g of sulphur
C. 7 g of nitrogen
D. 2.3 g of sodium

742. The number of valence electrons in 4.2 g of nitride ions is as follows if NA IS A Vogadro’s number:
A. 2.4 NA
B. 4.2 NA
C. 1.6 NA
D. 3.2 NA

743. The maximum amount of BaSO4 precipitated on mixing BaCl2 (0.5 M) with H2SO4 (1M) will correspond to:
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M

744. The largest no of molecules is in:
A. 34 grams of water
B. 28 grams of CO2
C. 46 grams of CH3OH
D. 54 grams of N2O5

745. 9.85 grams of BaCO3 (AT Mass BA=137) will release 9.85 grams of CO2 at STP on heating, assuming complete decomposition.
A. 0.84 L
B. 0.24 L
C. 4.06 L
D. 1.12 L

746. Which of the following chemical is used for the preparation of artificial flavors and essences?
(A) Methyl Alcohol
(B) Dimethyl Ketone
C. Ethyl Acetate
(D) Formic Acid

747. Hemiacetal is formed when formaldehyde adds one molecule of?
(A) Acetic Acid
(B) Diethyl Ether
C. Ethyl Alcohol
(D) Acetone

748. Which of the following substance is a weak electrolyte?
(A) HCl
(B) H2SO4
C. CH3COOH
(D) NaCl

749. Ca(OH)2 is commonly known as?
(A) Quick Lime
B. Slaked Lime
(C) Soda Ash
(D) Washing Soda

750. A type of blood disease which is caused by radiation such as X-Rays and Gamma Rays is?
(A) Malaria
(B) Tuberculosis
(C) Hepatitis
D. Leukemia