Lecturer Chemistry Past Paper 14-03-2013 by SPSC

Q21: Which of the following process does not use a catalyst?

مندرجہ ذیل میں سے کون سا عمل اتپریرک استعمال نہیں کرتا ہے؟

Contact process

Haber process

Thermite process

None of these

Q22: Formic acid and acetic acid are distinguished from each other by reaction with ______?

فارمک ایسڈ اور ایسٹک ایسڈ ______ کے ساتھ رد عمل کے ذریعہ ایک دوسرے سے ممتاز ہیں؟

FeCl3

N3OH

HgCl2

None of these

Q23: Mechanism for the emission of β⁻ particle from nucleus is that in which?

Positron is changed into electrons

Neutron is changed into proton

Proton is changed into neutron

None of these

Q24: Which of the following atoms has greatest tendency to capture an additional electrons?

مندرجہ ذیل میں سے کون سے جوہری میں اضافی الیکٹرانوں پر قبضہ کرنے کا سب سے بڑا رجحان ہے؟

S

F

Cl

None of these

Q25: The least stable carbanion is _____?

کم سے کم مستحکم کاربنین _____ ہے؟

(CH₃)₃C⁻

CH₃⁻

(CH₃)₂C⁻

None of these

Q26: How much energy is required to boil a kettle of water containing 1 litre at 15°C (Specific heat capacity of water = 4.18?

3.5 kJ

3550 kJ

355 kJ

None of these

Q27: The correct order of spectral regions with respect to increasing frequency is _____?

بڑھتی ہوئی تعدد کے سلسلے میں ورنکرم علاقوں کا صحیح حکم _____ ہے؟

UV, ViS, IR, RF

UV,ViS, RF, IR

RF, IR, ViS, UV

None of these

Q28: Which one among the pairs cannot be separated by H2S in dilute HCl?

Cu^2+, Zn^2+

Bi^3+, Sn^4+

Al^3+, Hg^2+

None of these

Q29: Which one of the following has no dipole moment?

مندرجہ ذیل میں سے کون سا ڈوپول لمحہ نہیں ہے؟

Trans-1,2-Dichloroethene

1,1-Dichloroethene

1,2-Dichloroethene

None of these

Q30: In analysts are measuring chloride contents in water in four different laboratories. If known (accepted) value of chloride is 105 mg/L then results obtained in ______ laboratory have low accuracy and high precision.

85.8mg/L, 86.7mg/L, 88.85mg/L, 87mg/L

107.5mg/L, 105 mg/L, 109mg/L, 110.5mg/L

102mg/L, 103mg/L, 102.7mg/L, 101.5mg/L

None of these