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Q:

Which of the following group is NOT Dobereiner Triads?

 

A) Li, Na, K B) N, P Au
C) Cl, Br, I D) Ca, Sr, Ba

Answer:   B) N, P Au



Explanation:
Subject: Chemistry
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Q:

Which process is not associated with mechanical weathering?

A) reactions with oxygen B) frost wedging
C) biological oxygen activity D) unloading
 
Answer & Explanation Answer: A) reactions with oxygen

Explanation:

The process that occurs when physical forces break rock into smaller pieces without changing the rock's chemical composition is called mechanical weathering.

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Q:

Valency of an element depends on which of the following?

I. Number of losing electron

II. Number of gaining electron

III. Number of sharing electron

 

A) Only I and II B) Only I and III
C) Only II and III D) All I, II and III
 
Answer & Explanation Answer: D) All I, II and III

Explanation:
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0 15507
Q:

Which of the following fuel has maximum calorific value?

A) Petrol B) Coal
C) Wood D) Cow dung  
 
Answer & Explanation Answer: A) Petrol

Explanation:
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Q:

Which one of the following is lyophilic colloid?

A) Gold sol B) Smoke
C) Cloud D) Starch aqueous solution
 
Answer & Explanation Answer: D) Starch aqueous solution

Explanation:

Starch aqueous solution is a lyophilic colloidal solution.

 

Lyophilic colloids are liquid loving colloids.  When these colloids are mixed with suitable liquid high force of attraction exists between colloidal particles and liquid.

 

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Q:

Which element is not a part of a nitrogenous base?

A) Hydrogen B) Phosphorous
C) Carbon D) Nitrogen
 
Answer & Explanation Answer: B) Phosphorous

Explanation:
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0 846
Q:

Which of the statement(s) about the reaction given below is/are INCORRECT?

 

2PbO (s) + C (s) ⟶ 2Pb (s) + CO2 (g)

 

I. Lead is getting reduced.

II. Carbon is getting reduced.

III. Lead oxide is getting reduced.

 

A) Only I and II B) Only I and III
C) Only II and III D) All I, II and III
 
Answer & Explanation Answer: A) Only I and II

Explanation:
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0 9687
Q:

Which of the following statement(s) is/are CORRECT?

I. Bases are soapy to touch.

II. Bases generate OH– ions.

III. Metal oxides dissolve in water to form Acidic solution. 

 

A) Only I and II   B) Only I and II
C) Only II and III D) All I, II and III
 
Answer & Explanation Answer: A) Only I and II  

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1 18885
Q:

Match the following items.

A) I – 2, II – 3, III – 4, IV – 1 B) I – 2, II – 3, III – 1, IV – 4
C) I – 3, II – 2, III – 1, IV – 4 D) I – 2, II – 1, III – 3, IV – 4
 
Answer & Explanation Answer: A) I – 2, II – 3, III – 4, IV – 1

Explanation:
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