1. Which of these groups of metals react with cold water?
A. Mg, Zn and Fe
B. Sn, Pb and Cu
C. Ca, Mg and Zn
D. K, Na and Ca
2. To 2.0cm3 of solution of X, NaOH solution was added drop by drop until in excess, a reddish-brown ppt insoluble in excess NaOH. The cation contained in sample X is:
A. Cu2+
B. Fe3-
C. Ca2+
D. Cr3+
3. Two radioactive elements Q and S have a half-life period of 10 hours and 20 hours respectively. Therefore,
A. S decay faster than Q.
B. Q is twice as stable as S.
C. emits fewer particles than S.
D. S is more stable than Q.
4. Excess acidity caused by acid rain can be neutralized by adding
A. more fertilizers
B. acidified soil
C. P2O5
D. lime
5. A chemical substance that speed up rate of chemical reaction is called
A. Pressure
B. concentration
C. catalysts
D. inhibitors
6. The rate of reaction does not depend upon
A. temperature
B. concentration of reactants
C. pressure
D. theory of expanding gases
7. All are ionic compounds except
A. AgCl
B. HNO3
C. NO2
D. (NH4)2CO3
8. The chemical formula of silver bromide is
A. Ag2Br3
B. AgBr
C. AgBrO
D. AgBr3.H2O
9. Aluminium (Al) is preferred in overhead power cables because
A. it is a good conductor
B. it acts as an insulator, in case of lightning
C. it prevents accidents
D. it is lighter in weight
10. Reactivity series of metals is also known as the
A. preferential series
B. electrochemical series
C. electrolytic series
D. selective discharge series
11. To make coloured glasses, small quantities of oxides of metals form coloured silicate are often added to the reaction mixture of Na2CO3 and SiO2. Such a metal is
A. potassium
B. Barium
C. Zinc
D. Cobalt
12. Which of the following compounds gives a yellow residue when heated and also reacts with aqueous sodium hydroxide to give a white gelatinous precipitate soluble in excess sodium hydroxide solution?
A. (NH4)2CO
B. ZnCO3
C. Al2(SO4)2
D. PbCO3
13. The electronic configurations of two elements with similar chemical properties
are represented by
A. 1s22s22p5 and 1s22s22p4
B. 1s22s22p4 and 1s22s22p63s1
C. 1s22s22p63s1 and 1s22s22s1
D. 1s22s22p4 and 1s22s1
14. Which of the following metals burns with a brick-red flame?
A. Mg
B. Pb
C. Ca
D. Na
15. The noble gases owe their inactivity to
A. hexagonal shape
B octet configuration
C. obtuse configuration
D. Nonagon shape
16. Which of the following substance is not a compound.
A. Bronze
B. Ethanol
C. Sulphur power
D. Distilled water.
17. In an electrolytic cell, electrons enter the system through the
A. electrodes
B. anode
C. cathode
D. current
18. Permanent hardness of water is due to the presence of calcium sulphate which is not softened by boiling. Which of the following chemical is normally used to soften it?
A. KMnO4
B. CaCl2
C. Na2CO3
D. FeSO4
19. How many moles of alanine C3H7NO2, are there in 159g of alanine?
A. 1.42 x 104
B. 1.78
C. 0.992
D. 0.560
20. How many atoms are in one mole of CH3OH?
A. 6
B. 6.0 x 1023
C. 12.0 x 1023
D. 3.60 x 1034
You can check NDA Chemistry questions 21 – 40 here
