Question

please don't send illevent answer.....it's urgent​

Answer 1

Answer:

it is correct answer may be

Answer 2

Answer 1:

(d) 10

A solution turns red litmus to blue, it's pH is likely to 10.

Explanation:

As we know that bases turns red litmus to blue and bases have pH more than 7. So it is the correct answer.

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Answer 2:

(d) Cu (Copper)

Cu will not displace hydrogen from acid.

Explanation:

The reason is simple that inorder to display "Hydrogen" from it's compound, the element must be more reactive than hydrogen. But "Cu"(Copper) element is less reactive than hydrogen, it can't display Hydrogen from acid.

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Answer 3:

(b) less than 7

pH of $\sf H_2SO_4$ is less than 7.

Explanation:-

As we know that pH of acids is always less than 7 and also we know that H2SO4 is highly acidic. So it's pH must be less than 7.

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Answer 4:

Balanced chemical equation for reaction of dilute sulphuric acid and Zinc is:

$\Longrightarrow\boxed{\sf H_2SO_4+Zn\longrightarrow ZnSO_4+H_2\uparrow}$

Here this is a displacement reaction where "Zinc" being a more reactive element, displaces "Hydrogen" form it's compound.

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Answer 5:

Balanced chemical equation for reaction of dilute sulphuric acid and Aluminium is:

$\Longrightarrow\boxed{\sf{3H_2SO_4+2Al\longrightarrow Al_2(SO_4)_3+3H_2\uparrow}}$

Here this is also a displacement reaction where "Aluminium" being a more reactive element displaces Hydrogen form it's compound.

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Answer 6:

Balanced chemical equation for reaction of potassium with water is:

$\Longrightarrow{\boxed{\sf{2K+2H_2O\longrightarrow 2KOH+H_2\uparrow}}}$

Here this is also a displacement reaction where "Potassium" being more reactive element displaces Hydrogen form it's compound.

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Additional Information:

• Combination reaction:

The reaction in which 2 or more elements react to give a single product is called a combination reaction.

Ex-

$\sf H_2+O_2\longrightarrow H_2O$

• Decomposition reaction:

The reaction in which one element is broken down by the applied energy is called decomposition reaction.

Ex-

$\sf CaCO_3\overset{\Delta}{\longrightarrow}CaO+CO_2$

• Displacement reaction:

The reaction in which a more reactive element displaces a less reactive element from its compound is called displacement reaction.

Ex-

$\sf Zn+HCl\longrightarrow ZnCl_2+H_2$

• Double displacement reaction:

The reaction in which mutual exchange of ions takes place is called double displacement reaction.

Ex-

$\sf HCl+NaOH\longrightarrow NaCl+H_2O$