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PCC (Pyridinium chlorochromate, $C_5H_5NH^+CrO_3Cl^-$) is a mild oxidizing agent that converts primary alcohols to aldehydes without over-oxidizing to carboxylic acids. $CrO_3$, $K_2Cr_2O_7$, and $KMnO_4$ are stronger oxidants that convert primary alcohols all the way to carboxylic acids. PCC is the most suitable reagent for $R-CH_2OH \to R-CHO$.

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Urdu QUESTION #5147

Question 5648

اکبر الہ آبادی کی شاعری کی خصوصیت کیا ہے؟

مغربی تقلید کی مخالفت✔️
لسانیات
افسانے کی شاعری
ان میں سے کوئی نہیں

Correct Answer Logic:

اکبر الہ آبادی مغربی تقلید کے خلاف طنزیہ شاعری کے لیے مشہور ہیں۔

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Mathematics QUESTION #4088

Question 5649

If $\varphi: \mathbb{Z}_6 \to \mathbb{Z}_6$ is a one-to-one (injective) homomorphism, then $\ker(\varphi)$ is:

All of $\mathbb{Z}_6$
$\{0, 2, 4\}$
$\{0, 3\}$
$\{0\}$✔️

Correct Answer Logic:

A group homomorphism is injective if and only if its kernel is trivial (contains only the identity). Since $\varphi$ is one-to-one, $\ker(\varphi) = \{0\}$, the trivial subgroup of $\mathbb{Z}_6$.

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English QUESTION #2782

Question 5650

What does the PHRASAL VERB 'PUT OFF' mean?

To place something outside
To cancel something permanently
To delay or postpone something✔️
To turn off a device

Correct Answer Logic:

'Put off' means to delay or postpone something to a later time. Example: 'She put off the meeting until next week.' It is different from 'cancel' because 'put off' means rescheduling, not eliminating.

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Chemistry QUESTION #1429

Question 5651

Lattice enthalpy is always:

Positive and represents energy absorption✔️
Positive and represents energy release
Negative and represents energy absorption
Negative and represents energy release

Correct Answer Logic:

Lattice enthalpy (lattice dissociation energy) is defined as the energy required to completely separate one mole of a solid ionic compound into its gaseous ions. Since energy must be absorbed to overcome the strong electrostatic attractions, lattice enthalpy is always positive (endothermic). Lattice formation enthalpy (reverse process) is always negative.

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Tourism & Hospitality Management QUESTION #1658

Question 5652

The Destination Branding course identifies 'brand tracking surveys' as a key tool for managing destination brands. Which types of tracking mechanisms are specifically listed in the curriculum?

Only annual visitor satisfaction surveys
Online panel surveys, benchmarking surveys, omnibus-style surveys, visitor satisfaction surveys, and monitoring media coverage — used collectively to measure brand health and guide brand management decisions✔️
Social media follower counts and website traffic analytics only
Government tourism arrival statistics and hotel occupancy rates only

Correct Answer Logic:

Module 4 of the Destination Branding course — 'Managing the Brand' — specifically lists the following brand tracking tools: brand tracking surveys, online panel surveys, benchmarking surveys, omnibus-style surveys, visitor satisfaction surveys, and monitoring media coverage — forming a multi-method approach to measuring destination brand health, awareness, and perception over time.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3267

Question 5653

'Hemolysis' refers to the:

Production of blood
Destruction of Red Blood Cells✔️
Clotting of blood
Filtering of blood

Correct Answer Logic:

Hemolysis releases hemoglobin into the plasma.

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Biology QUESTION #529

Question 5654

Name the vertebrates which are without jaws.

Osteichthyes
Cyclostomata✔️
Chondrichthyes
None of these

Correct Answer Logic:

Cyclostomata (lampreys, hagfish) are jawless

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Paper-II (Pharmacognosy and Pharmaceutics-I) QUESTION #3646

Question 5655

'Colchicum' is a drug used primarily to treat:

Gout✔️
Asthma
Heartburn
Skin rash

Correct Answer Logic:

Colchicine is used for acute gout attacks.

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Chemistry QUESTION #5575

Question 5656

In Cannizzaro's reaction of trichloroacetaldehyde ($CCl_3CHO$) with NaOH, one product is sodium trichloroacetate. What is the other product?

Trichloromethanol
2,2,2-Trichloropropanol
Chloroform
2,2,2-Trichloroethanol✔️

Correct Answer Logic:

Cannizzaro reaction involves disproportionation of a non-enolizable aldehyde. $2CCl_3CHO + NaOH \to CCl_3COO^-Na^+\ (\text{sodium trichloroacetate}) + CCl_3CH_2OH\ (2{,}2{,}2\text{-trichloroethanol})$. One molecule is oxidized to the acid salt and the other is reduced to the alcohol.

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CISA QUESTION #1745

Question 5657

Which sequence correctly represents the steps of business process reengineering (BPR)?

Diagnose, envision, redesign, reconstruct
Evaluate, envision, redesign, reconstruct, review
Envision, initiate, diagnose, redesign, reconstruct, evaluate✔️
Initiate, evaluate, diagnose, reconstruct, review

Correct Answer Logic:

The correct BPR sequence is: Envision (recognize a need), Initiate (sponsor sets goals), Diagnose (document existing processes), Redesign (develop a new process), Reconstruct (implement changes), and Evaluate (post-monitoring for improvement).

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Mathematics QUESTION #4125

Question 5658

For $f(z) = \frac{1}{z}$, writing $z = re^{i\theta}$, the Cauchy-Riemann equations in polar form are satisfied when:

$u_r = \frac{1}{r}v_\theta$ and $v_r = -\frac{1}{r}u_\theta$
$u_r = \frac{1}{r}u_\theta$ and $v_r = \frac{1}{r}v_\theta$
$ru_r = v_\theta$ and $rv_r = -u_\theta$
Both (A) and (C) are equivalent correct forms✔️

Correct Answer Logic:

Polar C-R equations: $\frac{\partial u}{\partial r} = \frac{1}{r}\frac{\partial v}{\partial \theta}$ and $\frac{\partial v}{\partial r} = -\frac{1}{r}\frac{\partial u}{\partial \theta}$, equivalent to $ru_r = v_\theta$ and $rv_r = -u_\theta$.

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Library Sciences QUESTION #1561

Question 5659

Resource Description and Access (RDA) replaces which earlier cataloguing code and is structured around which conceptual model?

AACR1; MARC 21
ISBD; Dublin Core
AACR2; FRBR (Functional Requirements for Bibliographic Records)✔️
AACR2; UNIMARC

Correct Answer Logic:

RDA was developed as a successor to AACR2, structured around the FRBR (Functional Requirements for Bibliographic Records) and FRAD (Functional Requirements for Authority Data) conceptual models. It focuses on describing resources and their relationships rather than prescribing card-catalogue-era physical formats.

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Paper-I (Anatomy/Physiology and Biochemistry/Microbiology) QUESTION #3156

Question 5660

Which organ is most active in children for the 'T-cell' maturation and immune development?

Spleen
Thymus✔️
Tonsils
Appendix

Correct Answer Logic:

The thymus gland shrinks (atrophies) after puberty.

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