3
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



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Subject: Chemistry
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Q:

Biogas is produced from biomass by

A) destructive distillation B) fractional distillation
C) anaerobic fermentation D) dry distillation
 
Answer & Explanation Answer: C) anaerobic fermentation

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0 747
Q:

Which of the following is an unsaturated Hydrocarbon?

A) Butane B) Pentane
C) Ethyne D) Propane
 
Answer & Explanation Answer: C) Ethyne

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1 807
Q:

Name the Russian chemist who stated that the properties of elements are a periodic function of their atomic masses?

A) Markovnikov B) Zelinsky
C) Mendeleev D) Zaitsev
 
Answer & Explanation Answer: C) Mendeleev

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1 686
Q:

Saturated carbon compounds can form which types of chain structures?

 

I. Straight chain

II. Branched chain

 

A) Only I B) Only II
C) Neither I nor II   D) Both I and II
 
Answer & Explanation Answer: D) Both I and II

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2 12931
Q:

An atom can achieve octet by ______.

 

I. sharing electron

II. gaining electron

III. losing 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

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2 12158
Q:

Which substance is produced when alcohol is added with petrol and used as a fuel?

 

A) Only oxygen B) Only carbon-dioxide
C) Only water D) Carbon-dioxide and water both
 
Answer & Explanation Answer: B) Only carbon-dioxide

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3 14258
Q:

Isotopes have ______.

 

I. similar physical quantities and different chemical properties

II. different physical properties

III. similar chemical properties

 

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

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2 8701
Q:

Which of the below options is called a laughing gas?

A) N2O B) CO2
C) H2O D) SO2
 
Answer & Explanation Answer: A) N2O

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2 687