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Q:

Which among the following is false about acids?

A) They give H+ ions in aqueous solution B) Most acids contain hydrogen
C) They turn blue litmus red D) They are bad conductor of electricity in aqueous solution
 
Answer & Explanation Answer: D) They are bad conductor of electricity in aqueous solution

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Q:

Which   one   of   the   following   is   not   a semiconductor?

A) Silicon B) Germanium
C) Quartz D) Gallium arsenide
 
Answer & Explanation Answer: C) Quartz

Explanation:

Semiconductors are the basic materials used in the present solid state electronic devices like diode, transistor, ICs, etc. 2. Lattice structure and the atomic structure of constituent elements decide whether a particular material will be insulator, metal or semiconductor. Semiconductors are elemental (Si, Ge) as well as compound (GaAs, CdS, etc.). Silicon, Germanium, Gallium Arsenide are semiconductors, but Quartz is an insulator.

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Q:

If we take a small amount of washing soda and add approximately 1 mL of dilute hydrochloric acid to it, what will we observe?

A) only neutralisation reaction occurs, no gas is released B) white-coloured precipitate is formed
C) CO2 gas comes out with brisk effervescence D) H2 gas comes out with pop sound
 
Answer & Explanation Answer: C) CO2 gas comes out with brisk effervescence

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Q:

The volume of 10 g of gas X is 5.6 litre at NTP. What is the molecular weight of X?

A) 40 B) 60
C) 50 D) 20
 
Answer & Explanation Answer: A) 40

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Q:

............. elements have the largest atoms

A) F B) O
C) H D) Li
 
Answer & Explanation Answer: D) Li

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Q:

Chemical formula for sulphurous acid is:

A) H2SO4 B) H2SO3
C) H3SO3 D) H3SO4
 
Answer & Explanation Answer: B) H2SO3

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Q:

What is nature of pH of Milk?

A) Slightly Acidic B) Slightly Basic
C) Highly Acidic D) Highly Basic
 
Answer & Explanation Answer: A) Slightly Acidic

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Q:

The common name of lead (II) sulphide is

A) borax B) epsom salt
C) galena D) brimstone
 
Answer & Explanation Answer: C) galena

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