DIRECTORATE OF NURSING SINDH KARACHI DNSK 5 YEARS PAST PAPERS PDF
چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
- Remain unchanged
- Become less than 8
- Become greater than 8
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- A buffer solution resists sudden changes in pH when small amounts of acid or base are added.
- Sodium hydroxide (NaOH) is a strong base that increases the concentration of hydroxide ions (OH⁻).
- The added NaOH is neutralized partially by the acidic component of the buffer, but the pH generally increases slightly above 8.
Last verified on 27-10-2026
آکسیجن کے سالمے میں پائی بانڈ کس طرح بنتا ہے؟
- p-p parallel overlap
- s-s overlap
- s-p overlap parallel
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- In an oxygen molecule (O₂), a π-bond is formed by the sidewise (parallel) overlap of two p-orbitals.
- A π-bond is formed by lateral overlap, with electron density above and below the internuclear axis.
- A sigma (σ) bond forms through head-on overlap of orbitals, whereas a pi (π) bond forms through sideways overlap.
- The O₂ molecule contains one sigma bond and one pi bond in its double bond.
Last verified on 27-10-2026
فاسفورس پینٹا کلورائیڈ کی مستحکم سالماتی ساخت بنانے کے لیے مرکزی ایٹم کس قسم کی ہائبرڈائزیشن اختیار کرتا ہے؟
- sp-hybridization
- dsp³-hybridization
- sp³-hybridization
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- In the traditional valence-bond model, phosphorus in PCl₅ undergoes dsp³ (sp³d) hybridization.
- PCl₅ has a trigonal bipyramidal geometry, with three chlorine atoms in equatorial positions and two in axial positions.
- The three equatorial bonds are separated by 120°.
- While the axial bonds are at 90° to the equatorial bonds and 180° to each other.
Last verified on 27-10-2026
ایٹمی مداروں کے غیر سمتی اوورلیپنگ کی بنیاد پر کس مالیکیول کی مستحکم سالماتی ساخت کی وضاحت کی جاتی ہے؟
- Methanol
- Dihydrogen
- Methane
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Dihydrogen (H₂) forms when two hydrogen 1s atomic orbitals overlap head-on, creating a sigma (σ) bond.
- The 1s orbitals are spherical, so their overlap is non-directional.
- The H₂ molecule is linear.
- It has no bond angle to define.
Last verified on 27-10-2026
- Less than 3
- Equal to 7
- Greater than 5
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- A buffer solution resists changes in pH when a small amount of acid or base is added.
- Adding nitric acid (HNO₃), a strong acid, increases the hydrogen ion concentration and lowers the pH.
- The exact final pH depends on the buffer composition and the concentration and amount of nitric acid.
- If the added acid exceeds the buffer’s capacity, the pH can fall below 3.
Last verified on 27-10-2026
ایسیٹک ایسڈ کے مرتکز محلول میں ہائیڈروکلورک ایسڈ شامل کرنے سے کیا نتیجہ نکلتا ہے؟
- Increased alkalinity of solution
- Decreased chloride ion concentration
- Decreased acetate ion concentration
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Addition of HCl (strong acid) into CH3COOH (weak acid): CH3COOH ⇌ CH3COO- + H+
- HCl gives H+ common ion, which suppresses the ionization of acetic acid due to common ion effect.
- So [H+] increases, equilibrium shifts left, [CH3COO-] decreases.
Last verified on 27-10-2026
سب سے زیادہ بانڈ ڈسوسی ایشن انرجی کس قسم کی ہائبرڈائزیشن کے ذریعے بننے والے بانڈ سے وابستہ ہوتی ہے؟
- sp-hybridization
- dsp³-hybridization
- sp³-hybridization
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- sp-hybridization has 50% s-character, the highest among the given hybridization types.
- Greater s-character keeps the bonding electrons closer to the nucleus, generally resulting in a shorter bond length.
- The order of s-character is sp (50%) > sp² (33.3%) > sp³ (25%).
- Therefore, for comparable bonds between the same atoms, sp-hybridized bonds generally have the shortest bond length.
Last verified on 27-10-2026
کس قسم کی ہائبرڈائزیشن کے ذریعے بننے والے بانڈ میں بانڈ کی لمبائی سب سے کم ہوتی ہے؟
- sp-hybridization
- dsp³-hybridization
- sp³-hybridization
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- sp-hybridization has 50% s-character, the highest among the given hybridization types.
- Greater s-character keeps the bonding electrons closer to the nucleus, generally resulting in a shorter bond length.
- The order of s-character is sp (50%) > sp² (33.3%) > sp³ (25%).
- Therefore, for comparable bonds between the same atoms, sp-hybridized bonds generally have the shortest bond length.
Last verified on 27-10-2026
ہائیڈروجن سلفائیڈ کا آبی محلول سلفیورک ایسڈ سے گزرنا، کیا ہوگا؟
- Solidify the hydrogen sulphide gas
- Not affect the ionization of sulphuric acid
- Decrease the ionization of sulphuric acid
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Hydrogen sulphide (H₂S) dissolves in water and ionizes weakly, producing hydrogen ions (H⁺) and hydrosulphide ions (HS⁻).
- The added H⁺ ions shift the ionization equilibrium of sulphuric acid toward the unionized form, reducing its ionization due to the common-ion effect.
- The common-ion effect occurs when an ion already present in an equilibrium is added, suppressing further ionization of a weak electrolyte.
Last verified on 27-10-2026
پوٹاشیم کلورائیڈ کے آبی محلول میں پوٹاشیم ہائیڈرو آکسائیڈ شامل کرنے سے پوٹاشیم کلورائیڈ کی آئنائزیشن پر کیا اثر پڑے گا؟
- Become unpredictable
- Remain unchanged
- Decrease
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
- Potassium chloride (KCl) is a strong electrolyte that dissociates almost completely into K⁺ and Cl⁻ ions in water.
- Potassium hydroxide (KOH) also dissociates completely, adding more K⁺ ions to the solution.
Last verified on 27-10-2026
