# A crystalline solid substance has a density of 10g/cm3 and the length of the edge of the unit cell (FCC) is 2.0 A. How many numbers of atoms are present in 200 grams of the solid

1.  2 x 1023

2.  1 x 1026

3.  1 x 1025

4.  5 x 1027

4

1 x 10<sup>25</sup>

Explanation :
No Explanation available for this question

# For the reaction A+3B→2C+D, which one of the following is not correct

1.  Rate of disappearance of A = Rate of formation of D

2.  Rate of formation of C = 2/3 x Rate of disappearance of B

3.  Rate of formation of D = 1/3 x Rate of disappearance of B

4.  Rate of disappearance A = 2 x Rate of formation of C

4

Rate of disappearance A = 2 x Rate of formation of C

Explanation :
No Explanation available for this question

# Assertion (A): According to Lowry-Bronsted theory, a substance can function as an acid as well as a base. Reason (R): Acid reacts with a base to produce a salt. The correct answer is:

1.  Both (A) and (R) are true and (R) is the correct explanation of (A)

2.  Both (A) and (R) are true and (R) is not  the correct explanation of (A)

3.  (A) is true but (R) is not true

4.  (A) is not true but (R) is true

4

Both (A) and (R) are true and (R) is not&nbsp; the correct explanation of (A)

Explanation :
No Explanation available for this question

# Heat of formation of CO and CO2 are -26.4 and -94.0 Kcal/mole respectively. What is the heat of combustion of CO in Kcals

1.  +26.4

2.  120.6

3.  -67.6

4.  135.2

4

-67.6

Explanation :
No Explanation available for this question

# What is the emulsifier in milk

1.  Albumin

2.  Soap

3.  Gelatin

4.  Caesin

4

Caesin

Explanation :
No Explanation available for this question

# Which of the following statements is incorrect

1.  H2O2 has weak acidic property

2.  H2O2 has weak basic property

3.  H2O2 can act as an oxidizing agent

4.  H2O2 can act as an reducing agent

4

H<sub>2</sub>O<sub>2</sub> has weak basic property

Explanation :
No Explanation available for this question

# Aluminium metal becomes passive in

1.  Conc.HNO3

2.  dil.H2SO4

3.  very dil.HNO3

4.  Conc.H2SO4

4

Conc.HNO<sub>3</sub><sub></sub>

Explanation :
No Explanation available for this question

# A and B are the compounds of carbon. A on passing over red hot coke is converted to B. Then A and B are respectively:

1.  CO, CO2

2.  CO2, CO

3.  CH4, C2H6

4.  CCl4, CHCl3

4

CO<sub>2</sub>, CO<sub></sub>

Explanation :
No Explanation available for this question

# In P4O10, the number of oxygen atoms bonded to each phosphorus atom is:

1.  3

2.  4

3.  5

4.  6

4

4

Explanation :
No Explanation available for this question

# The oxidation numbers of sulphur in S8, SO2 and H2S, respectively are:

1.  0, +6, -2

2.  0, +4, -2

3.  0, +1, +2

4.  0, +1, -2

4

0, +4, -2

Explanation :
No Explanation available for this question

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