Contents<\/p>\n<\/div>

WBCS Preliminary Question – 2023<\/a><\/li>
WBCS Preliminary Question – 2022<\/a><\/li>
WBCS Preliminary Question – 2021<\/a><\/li>
WBCS Preliminary Question – 2020<\/a><\/li>
WBCS Preliminary Question – 2019<\/a><\/li>
WBCS Preliminary Question – 2018<\/a><\/li>
WBCS Preliminary Question – 2017<\/a><\/li>
WBCS Preliminary Question – 2016<\/a><\/li>
WBCS Preliminary Question – 2015<\/a><\/li>
WBCS Preliminary Question – 2014<\/a><\/li>
WBCS Preliminary Question – 2013<\/a><\/li>
WBCS Preliminary Question – 2012<\/a><\/li>
WBCS Preliminary Question – 2011<\/a><\/li>
WBCS Preliminary Question – 2010<\/a><\/li>
WBCS Preliminary Question – 2009<\/a><\/li>
WBCS Preliminary Question – 2008<\/a><\/li>
WBCS Preliminary Question – 2007<\/a><\/li>
WBCS Preliminary Question – 2006<\/a><\/li>
WBCS Preliminary Question – 2005<\/a><\/li>
WBCS Preliminary Question – 2004<\/a><\/li>
WBCS Preliminary Question – 2003<\/a><\/li>
WBCS Preliminary Question – 2002<\/a><\/li>
WBCS Preliminary Question – 2001<\/a><\/li>
WBCS Preliminary Question – 2000<\/a><\/li><\/ul><\/nav><\/div>\n\n
$\"Chemistry$ <\/div>\n
wbcs chemistry question paper<\/span><\/h6>\n
<\/span>WBCS Preliminary Question – 2023<\/span><\/span><\/h2>\n
50. Which is the <\/span>reducing agent<\/span><\/a> in the thermit reaction carried out for repairing of the railway track?<\/span><\/p>\n
(A) Iron oxide<\/p>\n
(B) Aluminium metal<\/span><\/p>\n
(C) Aluminium oxide<\/p>\n
(D) Iron metal<\/p>\n
\u00a0<\/p>\n
52. The ion of an element has three positive charge. Mass number of the atom is 27, and the number of neutrons is 14, What is the <\/span>number of electrons in the ion<\/span><\/a>?<\/span><\/p>\n
(A) 13<\/p>\n
(B) 10<\/span><\/p>\n
(C) 14<\/p>\n
(D) 16<\/p>\n
\u00a0<\/p>\n
54. <\/span>Two drops of liquid merge<\/span><\/a> to form a single drop. In this process energy is<\/span><\/p>\n
(A) absorbed.<\/p>\n
(B) released.<\/span><\/p>\n
(C) may be absorbed or released depending upon the specific heat of the liquid.<\/p>\n
(D) neither absorbed nor released.<\/p>\n
\u00a0<\/p>\n
55. If <\/span>number of molecules<\/span><\/a> present in 9g of water is <\/span>n<\/span>, then number of molecules present in 44g of carbon-di-oxide is<\/span><\/p>\n
(A) n<\/span><\/p>\n
(B) <\/span>2n<\/span><\/p>\n
(C) n\/2<\/span><\/p>\n
(D) 3n<\/span><\/p>\n
\u00a0<\/p>\n
60. Identify the substance which can dissolve in water:<\/p>\n
(A) Glucose<\/p>\n
(B) Urea<\/p>\n
(C) Acetone<\/p>\n
(D) All of the above<\/span><\/p>\n
\u00a0<\/p>\n
100. Mg (s) +O2<\/span>(g) –> MgO (s) + energy, this reaction may be classified as a\/an<\/p>\n
(A) Combination reaction<\/p>\n
(B) Oxidation reaction<\/p>\n
(C) Exothermic reaction<\/p>\n
(D) All of the above<\/span><\/p>\n
\u00a0<\/p>\n
152. According to Newlands law of octaves, <\/span>beryllium resembles<\/span><\/a> which of the following elements?<\/span><\/p>\n
(A) Sodium<\/p>\n
(B) Magnesium<\/span><\/p>\n
(C) Calcium<\/p>\n
(D) Aluminium<\/p>\n
\u00a0<\/p>\n
156. <\/span>Baking soda is a mixture<\/span><\/a> of<\/span><\/p>\n
(A) sodium carbonate and acetic acid<\/p>\n
(B) sodium carbonate and tartaric acid<\/p>\n
(C) sodium hydrogen carbonate and tartaric acid<\/span><\/p>\n
(D) sodium hydrogen carbonate and acetic acid<\/p>\n
\u00a0<\/p>\n
191. What happens when the <\/span>potassium iodide solution is added<\/span><\/a> to a solution of lead nitrate?<\/span><\/p>\n
(A) White precipitation of lead iodide is formed.<\/p>\n
(B) Yellow precipitation of lead iodide is formed.<\/span><\/p>\n
(C) Red precipitation of lead iodide is formed.<\/p>\n
(D) Black precipitation of lead iodide is formed.<\/p>\n
\u00a0<\/p>\n
\n
\n
\n \n $\"Mock$ \n<\/a>\n<\/div>\n\n
\n