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Chemistry-

General

Easy

Question

Out of Ca²⁺ , Al³⁺ , Bi³⁺ , Mg²⁺ and Zn²⁺ the reagents NH₄Cl and aqueous NH₃ will precipitate

Ca²⁺ , Al³⁺
Al³⁺ , Bi³⁺
Bi³⁺ , Mg²⁺
Mg²⁺ , Zn²⁺

The correct answer is: Al³⁺ , Bi³⁺

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The addition of NaCl to AgCl decreases the solubility of AgCl , because

The addition of NaCl to AgCl decreases the solubility of AgCl , because

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How do we differentiate between Fe³⁺ and Cr³⁺ in group III ?

How do we differentiate between Fe³⁺ and Cr³⁺ in group III ?

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In qualitative analysis , to identify the IIA group sulphides , HCl is added to salt solution before the addition of H₂S . Because

In qualitative analysis , to identify the IIA group sulphides , HCl is added to salt solution before the addition of H₂S . Because

chemistry-General

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If $c o s invisible function application alpha plus 2 c o s invisible function application beta plus 3 c o s invisible function application gamma equals s i n invisible function application alpha plus 2 s i n invisible function application beta plus 3 s i n invisible function application gamma equals 0$ then $s i n invisible function application 3 alpha plus 8 s i n invisible function application 3 beta plus 27 s i n invisible function application 3 gamma equals$

If $c o s invisible function application alpha plus 2 c o s invisible function application beta plus 3 c o s invisible function application gamma equals s i n invisible function application alpha plus 2 s i n invisible function application beta plus 3 s i n invisible function application gamma equals 0$ then $s i n invisible function application 3 alpha plus 8 s i n invisible function application 3 beta plus 27 s i n invisible function application 3 gamma equals$

$1 comma alpha subscript 1 end subscript comma alpha subscript 2 end subscript comma alpha subscript 3 horizontal ellipsis horizontal ellipsis end subscript alpha subscript n minus 1 end subscript$ are the n^th roots of unity and n is an even natural number, then $open parentheses 1 plus alpha subscript 1 end subscript close parentheses open parentheses 1 plus alpha subscript 2 end subscript close parentheses open parentheses 1 plus alpha subscript 3 end subscript close parentheses horizontal ellipsis horizontal ellipsis open parentheses 1 plus alpha subscript n minus 1 end subscript close parentheses equals$

$1 comma alpha subscript 1 end subscript comma alpha subscript 2 end subscript comma alpha subscript 3 horizontal ellipsis horizontal ellipsis end subscript alpha subscript n minus 1 end subscript$ are the n^th roots of unity and n is an even natural number, then $open parentheses 1 plus alpha subscript 1 end subscript close parentheses open parentheses 1 plus alpha subscript 2 end subscript close parentheses open parentheses 1 plus alpha subscript 3 end subscript close parentheses horizontal ellipsis horizontal ellipsis open parentheses 1 plus alpha subscript n minus 1 end subscript close parentheses equals$

Statement-I : If $x subscript n end subscript equals c o s invisible function application open parentheses pi divided by 2 to the power of n end exponent close parentheses plus i s i n invisible function application open parentheses pi divided by 2 to the power of n end exponent close parentheses$ then $x subscript 1 end subscript times x subscript 2 end subscript times x subscript 3 end subscript horizontal ellipsis horizontal ellipsis equals negative 1$
Statement-II : $x subscript n end subscript equals c o s invisible function application open parentheses pi divided by 4 to the power of n end exponent close parentheses plus i s i n invisible function application open parentheses pi divided by 4 to the power of n end exponent close parentheses$ then $x subscript 1 end subscript times x subscript 2 end subscript times x subscript 3 end subscript horizontal ellipsis horizontal ellipsis infinity equals negative 1$

Statement-I : If $x subscript n end subscript equals c o s invisible function application open parentheses pi divided by 2 to the power of n end exponent close parentheses plus i s i n invisible function application open parentheses pi divided by 2 to the power of n end exponent close parentheses$ then $x subscript 1 end subscript times x subscript 2 end subscript times x subscript 3 end subscript horizontal ellipsis horizontal ellipsis equals negative 1$
Statement-II : $x subscript n end subscript equals c o s invisible function application open parentheses pi divided by 4 to the power of n end exponent close parentheses plus i s i n invisible function application open parentheses pi divided by 4 to the power of n end exponent close parentheses$ then $x subscript 1 end subscript times x subscript 2 end subscript times x subscript 3 end subscript horizontal ellipsis horizontal ellipsis infinity equals negative 1$

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Assertion :- Glycolysis is common between aerobic & anaerobic respiration.
Reason:- Glycolysis can takes place in presence and absence of O₂

Assertion :- Glycolysis is common between aerobic & anaerobic respiration.
Reason:- Glycolysis can takes place in presence and absence of O₂

Assertion :- Glycolysis is common step in aerobic & anaerobic respiration.
Reason:- Glycolysis splits the pyruvate in to H₂O & CO₂

Assertion :- Glycolysis is common step in aerobic & anaerobic respiration.
Reason:- Glycolysis splits the pyruvate in to H₂O & CO₂

Light wave is travelling along $y$ -direction. If the corresponding E vector at any time is along the $x$ -axis, the direction of B vector at that time is along

Light wave is travelling along $y$ -direction. If the corresponding E vector at any time is along the $x$ -axis, the direction of B vector at that time is along

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A flag staff stands upon the top of a building. At a distance d mt the angles of elevation of the tops of the flag staff and building are α and β respectively. The height of the flag staff is

A flag staff stands upon the top of a building. At a distance d mt the angles of elevation of the tops of the flag staff and building are α and β respectively. The height of the flag staff is

An aeroplane flying horizontally 1km above the ground is observed at an elevation of 60°. After 10sec the elevation is observed to be 30° then the uniform speed per hour of the aeroplane is

An aeroplane flying horizontally 1km above the ground is observed at an elevation of 60°. After 10sec the elevation is observed to be 30° then the uniform speed per hour of the aeroplane is

A pole 50mt high stand on a building 250mt high. To an observer at a height of 300mt the building and the pole subtends same angle. The distance of the observer from the top of pole is

A pole 50mt high stand on a building 250mt high. To an observer at a height of 300mt the building and the pole subtends same angle. The distance of the observer from the top of pole is

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If w is a complex cube root of unity then the value of $c o s invisible function application open square brackets open curly brackets left parenthesis 1 minus w right parenthesis open parentheses 1 minus w to the power of 2 end exponent close parentheses plus left parenthesis 2 minus w right parenthesis open parentheses 2 minus w to the power of 2 end exponent close parentheses close close$ $open open plus horizontal ellipsis horizontal ellipsis.. plus left parenthesis 10 minus w right parenthesis open parentheses 10 minus w to the power of 2 end exponent close parentheses close curly brackets fraction numerator pi over denominator 9 end fraction close square brackets$ is

If w is a complex cube root of unity then the value of $c o s invisible function application open square brackets open curly brackets left parenthesis 1 minus w right parenthesis open parentheses 1 minus w to the power of 2 end exponent close parentheses plus left parenthesis 2 minus w right parenthesis open parentheses 2 minus w to the power of 2 end exponent close parentheses close close$ $open open plus horizontal ellipsis horizontal ellipsis.. plus left parenthesis 10 minus w right parenthesis open parentheses 10 minus w to the power of 2 end exponent close parentheses close curly brackets fraction numerator pi over denominator 9 end fraction close square brackets$ is

If z=x+iy and P represents z in the Argand plane and mod(2z-3)=4, then the locus of P is

If z=x+iy and P represents z in the Argand plane and mod(2z-3)=4, then the locus of P is

The maximum kinetic energy (E_k) of emitted photoelectrons against frequency v of incident radiation is plotted as shown in fig. The slope of the graph is equal to

The maximum kinetic energy (E_k) of emitted photoelectrons against frequency v of incident radiation is plotted as shown in fig. The slope of the graph is equal to

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