(1). Portland cement is manufactured by using

• (a). limestone, clay and sand
• (b). limestone, gypsum and sand
• (c). limestone, gypsum and alumina
• (d). limestone, clay and gypsum
• (e). None of these

(2). The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. the thermal stability of these hydrides decreases in which of the following orders?

• (a). NaH>LiH>KH>RbH>CsH
• (b). LiH>NaH>KH>RbH>CsH
• (c). CsH>RbH>KH>NaH>LiH
• (d). KH>NaH>LiH>CsH>RbH
• (e). None of these

(3). Solubility of the alkaline earth metal sulphates in which decreases in the sequence

• (a). Sr>Ca>Mg>Ba
• (b). Ba>Mg>Sr>Ca
• (c). Mg>Ca>Sr>Ba
• (d). Ca>Sr>Ba>Mg
• (e). None of these

(4). 20.0 g of a magnesium carbonate sample decomposes the heating to give carbon dioxide and 8.0 g magnesium oxide what will be the percentage purity of magnesium carbonate in the sample? (At.wt.of Mg=24)

• (a). 96
• (b). 60
• (c). 84
• (d). 75
• (e). None of these

(5). Frequency of matter wave is equal to

• (a). (KE)/2h
• (b). 2(KE)/h
• (c). (KE)/h
• (d). λ
• (e). None of these

(6). Heaviest particle is

• (a). meason
• (b). neutron
• (c). proton
• (d). electron
• (e). None of these

(7). The ratio of specific charge of a proton and an α-particle is

• (a). 2:1
• (b). 1:2
• (c). 1:4
• (d). 1:1
• (e). None of these

(8). Nuclear theory of the atom was put forward by

• (a). Rutherford
• (b). aston
• (c). neils bohr
• (d). J.J. thomson
• (e). None of these

• (a). 1
• (b). 2
• (c). 3
• (d). 4
• (e). None of these

• (a). A-III B-IV C-I D-II
• (b). A-II B-III C-IV D-I
• (c). A-I B-II C-III D-V
• (d). A-IV B-III C-II D-I
• (e). None of these