Explanation

• Sir James Chadwick discovered the neutron in 1932.
• He was a British physicist.
• His discovery completed the basic picture of the atomic nucleus.
• He received the Nobel Prize in Physics in 1935 for this discovery.

Additional information:

• J. J. Thomson – Electron (1897)
• Ernest Rutherford – Atomic nucleus (1911) and Proton (1917)

Last verified on 03-07-2026

Explanation

• The correct phrase is "prefer tea to coffee."
• We use "prefer + noun + to + noun" when comparing two choices.
• Example: I prefer tea to coffee.

Last verified on 01-07-2026

Explanation

• Calcium chloride (CaCl₂) is used as a drying agent in a desiccator.
• It absorbs moisture from the air.
• It keeps substances dry and free from water vapor.
• Desiccators are used in laboratories for drying chemicals.
• CaCl₂ is highly hygroscopic.

Last verified 18-06-2026

Explanation

Explanation

Defective means غلطی یا خامی ہونا ؛ صحیح طریقے سے کام نہیں کرنا

Imperfect means کامل نہیں یا غلطیاں ہیں

Explanation

Molten NaCl conducts electricity.

Because it contains free-moving Na⁺ and Cl⁻ ions.

Explanation

Lithium aluminium hydride (LiAlH₄) is a strong reducing agent.

It reduces carboxylic acids to primary alcohols effectively.

Explanation

Curie (Ci) is a unit that measures the rate of radioactive decay.

1 Curie = 3.7 × 10¹⁰ disintegrations per second.

Explanation

Devised means سوچ یا تخلیقی صلاحیتوں کے ساتھ ایجاد ، منصوبہ بندی کرنے یا کچھ نیا بنانے کے لئے

Invented means سوچ یا تخلیقی صلاحیتوں کے ساتھ ایجاد ، منصوبہ بندی کرنے یا کچھ نیا بنانے کے لئے

Plan means احتیاط یا چالاکی سے کسی چیز کی ایجاد ، تخلیق کرنے یا منصوبہ بندی کرنے کے لئے

Explanation

For 2p orbitals, the principal quantum number (n) is 2.

The azimuthal quantum number (l) for a p-orbital is 1.

So, n = 2, l = 1 is correct.