Recent questions tagged 78

For a p-type semiconductor which of the following statements is true?

asked Jul 8, 2019 by pady_1

1 answer

The element which can displace three other halogens from their compounds is :

asked Dec 19, 2018 by pady_1

0 answers

Ethyne is treated with $30 \% \; H_2SO_4$ in the presence of $1\%$ mercuric sulphate at $70^{\circ}C$. What is the product formed ?

asked Dec 19, 2018 by pady_1

0 answers

Which is the molecular formula of gypsum ?

asked Dec 19, 2018 by pady_1

0 answers

Aceic acid is reacted with metallic sodium to form hyrdogen and X. When X is heated with sodalime, Y and sodium carbonate are formed. Y is ......... ?

asked Dec 11, 2018 by pady_1

0 answers

Number of $P-O$ bonds in $P_4O_{10}$ is :

asked Dec 11, 2018 by pady_1

0 answers

The orbital angular momentum for an electron revolving in an orbit is given by $\sqrt{l(l+1)} \frac{h}{2 \pi} $. The momentum for an s-electron will be given by :

asked Dec 11, 2018 by pady_1

0 answers

Which of the following compounds will be suitable for Kjeldahl's method for nitrogen estimation ?

asked Dec 11, 2018 by pady_1

0 answers

The products obtained when chlorine gas reacts with cold and dilute aqueous NaOH are :

asked Dec 11, 2018 by pady_1

0 answers

Two sides of a rhombus are along the lines, $x−y+1=0$ and $7x−y−5=0$. If its diagonals intersect at $(−1, −2)$, then which one of the following is a vertex of this rhombus ?

asked Dec 11, 2018 by pady_1

1 answer

The points $(0, \frac{8}{3})\; (1,3)$ and $(82, 30)$

asked Dec 11, 2018 by pady_1

1 answer

For which of the following molecule significant $\mu \neq 0$?

asked Dec 11, 2018 by pady_1

0 answers

A projectile is given an initial velocity of $(\hat{i} + 2 \hat{j}) m/s$, where $\hat{i}$ is along the ground and ˆj is along the vertical. If $g = 10 m/s^2$, the equation of its trajectory is:

asked Dec 11, 2018 by pady_1

0 answers

Very pure hydrogen (99.9%) can be made by which of the following processes ?

asked Dec 11, 2018 by pady_1

0 answers

A 5.2 molal aqueous solution of methyl alcohol, $CH_3OH$, is supplied. What is the mole fraction of methyl alcohol in the solution ?

asked Dec 11, 2018 by pady_1

0 answers

If $\alpha$ and $\beta$ are the roots of the equation $x^2 - x + 1 =0$, then $\alpha^{2009} + \beta^{2009}$ =

asked Dec 11, 2018 by pady_1

0 answers

The ellipse $x^2+4y^2 = 4$ is inscribed in a rectangle aligned with the coordinate axes, which in turn in inscribed in another ellipse that passes through the point (4, 0). Then the equation of the ellipse is

asked Nov 29, 2018 by pady_1

0 answers

While measuring the speed of sound by performing a resonance column experiment, a student gets the first resonance condition at a column length of 18 cm during winter. Repeating the same experiment during summer, she measures the column length to be x cm for the second resonance.Then

asked Nov 29, 2018 by pady_1

1 answer

Two springs, of force constants $k_1$ and $k_2$ are connected to a mass m as shown. The frequency of oscillation of the mass is $f$. If both $k_1$ and $k_2$ are made four times their original values, the frequency of oscillation becomes :

asked Nov 29, 2018 by pady_1

0 answers

A metal, M forms chlorides in its $+2$ and $+4$ oxidation states. Which of the following statements about these chlorides is correct ?

asked Nov 13, 2018 by pady_1

1 answer

Which of the following oxides is amphoteric in character ?

asked Nov 5, 2018 by pady_1

0 answers

Which one of the following ions has the highest value of ionic radius ?

asked Nov 5, 2018 by pady_1

1 answer

Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their

asked Aug 21, 2018 by pady_1

1 answer

Anaphase Promoting Complex (APC) is protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur ?

asked Aug 21, 2018 by pady_1

2 answers

The standard petal of a papilionaceous corolla is also called -

asked Aug 21, 2018 by pady_1

1 answer

The cutting of DNA at specific locations became possible with the discovery of -

asked Aug 21, 2018 by pady_1

1 answer

D(+) glucose reacts with hydroxyl amine and yield an oxime. The structure of the oxime would be:

asked Aug 20, 2018 by pady_1

1 answer

Antiseptics and disinfectants either kill or prevent growth of microrganisms. Identify which of the following statements is not true-

asked Aug 20, 2018 by pady_1

1 answer

Sulphur trioxide can be obtained by which of the following reaction :

asked Aug 20, 2018 by pady_1

1 answer

Which of the following is least likely to behave as Lewis base ?

asked Aug 16, 2018 by pady_1

1 answer

The correct order of increasing bond angles in the following species is:

asked Jul 26, 2018 by pady_1

1 answer

Which of the following complex ions is expected to absorb visible light ? {At no. Zn = 30, Sc = 21, Ti = 22, Cr = 24)

asked Jul 26, 2018 by pady_1

1 answer

The measurement of the electron position is associated with an uncertainty in momentum, which is equal to $1 \times 10^{ –18}$ g $cm s^{ –1}$. The uncertainty in electron velocity is : (Mass of an electron is $9 \times10^{–28}$ g)

asked Jul 26, 2018 by pady_1

1 answer

Which one of the following orders correctly represents the increasing acid strengths of the given acids:

asked Jul 26, 2018 by pady_1

1 answer

Which of the following is not chiral:-

asked Jul 25, 2018 by pady_1

0 answers

Which functional group participates in disulphide bond formation in proteins :-

asked Jul 24, 2018 by pady_1

1 answer

Chloropicrin is obtained by the reaction of

asked Jul 24, 2018 by pady_1

1 answer

The compound <img src = " "/> on reaction with $NaIO_4$ in the presence of $KMnO_4$ given :

asked Jul 24, 2018 by pady_1

0 answers

Atomic number of Cr and Fe are respectively 24 and 26, which of the following is paramagnetic with the spin of electron : -

asked Jul 23, 2018 by pady_1

2 answers

Standard electrode potential are $Fe^{+2}/Fe\; \; \;$ $\;\; \;E^o = -0.44$ $Fe^{+3}/Fe^{+2} \; \; \;$ $\; \; \; E^o = 0.77$ If $Fe^{+2}, Fe^{+3}$ and $Fe$ block are kept together, than :-

asked Jul 20, 2018 by pady_1

1 answer

Which compound form linear polymer due to H-bond :

asked Jul 20, 2018 by pady_1

1 answer

When $X\rightarrow{_7N^{14}}+2\beta^-$ – then number of neutron will be in X :

asked Jun 15, 2018 by pady_1

1 answer

Tammy recorded the amount of time she spent on six activities over a twenty four hour period and drew a bar graph, as follows:,Approximately what percentage of the day did she spend on playing sport?

asked Dec 31, 2015 by pady_1

1 answer

Find the area of a rectangular field whose length is 120 m and breadth is 80 m.

asked Dec 31, 2015 by pady_1

1 answer

Justin operates an orange juice stand. On Monday he used $\large\frac{3}{4}$ of a bag of oranges. On Tuesday he used $\large\frac{1}{10}$ as many oranges as on Monday. How many bags of oranges did Justin use on Tuesday?

asked Dec 31, 2015 by pady_1

1 answer

The school canteen has 3 round tables and 17 rectangular tables. Each round table has 3 chairs, and each rectangular table has 9 chairs. How many chairs are there in all?

asked Dec 31, 2015 by pady_1

0 answers

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