# In the above reaction, X and Y respectively are

1.  SiO2 and Si

2.  H4SiO4 and SiO2

3.  H2SiCl6 and SiO2

4.  H4SiO4 and Si

4

H<sub>4</sub>SiO<sub>4</sub> and SiO<sub>2

Explanation :
No Explanation available for this question

# For a reversible reaction if the concentrations of the reactants are doubled, then the equilibrium:

1.  be halved

2.  be doubled

3.  remain the same

4.  become 1/4th

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remain the same

Explanation :
No Explanation available for this question

# What is the wave number of 4th line in Balmer series of hydrogen spectrum (R=1,09,677 cm-1)

1.  24,630 cm-1

2.  24,360 cm-1

3.  24,730 cm-1

4.  24,372 cm-1

4

24,372 cm<sup>-1</sup>

Explanation :
No Explanation available for this question

# Assertion(A): CO2 is linear Reason(R): It is not in SP-hybridized state 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 but (R) is not the correct explanation of (A)

3.  (A) is true but (R) is false

4.  (A) is false but (R) is true

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

Explanation :
No Explanation available for this question

# 100 mL of 0.1M H2SO4 is added to 200 mL of 0.1M  NaOH.What is the PH of the resulting mixture

1.  2

2.  7

3.  10

4.  12

4

7

Explanation :
No Explanation available for this question

# For a first-order reaction, the half-life period is:

1.  dependent on the square of the initial concentration

2.  dependent on first power of initial concentration

3.  dependent on the square root of initial concentration

4.  independent on initial concentration

4

independent on initial concentration

Explanation :
No Explanation available for this question

# An increase in pressure would favour the following reaction:

1.  N2O4 ⇌ 2NO2

2.  2SO2 + O2 ⇌ 2SO3

3.  N2 + O2 ⇌ 2NO

4.  H2 + I2 ⇌ 2HI

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2SO<sub>2</sub> + O<sub>2</sub> &#8652; 2SO<sub>3</sub>

Explanation :
No Explanation available for this question

# The heat of combustion of methane at 298 K is expressed by:CH4(g)+2O2(g)→CO2(g)+2H2O(I), ΔH=890.2kJThe magnitude of ΔE of the reaction at this temperature is:

1.  infinity

2.  less than ΔH

3.  equal to ΔH

4.  greater than ΔH

4

greater than &#916;H

Explanation :
No Explanation available for this question

# 0.202g of a substance gave on combustion 0.361g of CO2 and O.147g of H2O.What is the empirical formula of the substance

1.  C6H6O6

2.  C7H7O7

3.  C3H6O2

4.  C4H5O3

4

C<sub>3</sub>H<sub>6</sub>O<sub>2</sub>

Explanation :
No Explanation available for this question

# Which of the following statements concerning heavy water is correct

1.  It is used as a moderator in nuclear reactors

2.  It occurs in plenty natural water

3.  It is also known as dry ice

4.  It is an isotope of water

4