Chemistry-
General
Easy
Question
Which of the following do not convert into oxide on heating?
- Li2CO3
- K2CO3
- CaCO3
- MgCO3
The correct answer is: K2CO3
Related Questions to study
Chemistry-
A 20 litre box contains and O? at equilibrium at 
Assume that 
and total pressure is 8 atm; the partial pressure of 03 is:
A 20 litre box contains and O? at equilibrium at Assume that and total pressure is 8 atm; the partial pressure of 03 is:
Chemistry-General
Chemistry-
Butyne on reaction with hot alkaline KMn04 gives:
Butyne on reaction with hot alkaline KMn04 gives:
Chemistry-General
Chemistry-
A: Addition of NH4OH to an aqueous solution of BaCl2 in the presence of excess NH4Cl precipitates Ba(OH)2 because
R: Ba(OH)2 is soluble in water
A: Addition of NH4OH to an aqueous solution of BaCl2 in the presence of excess NH4Cl precipitates Ba(OH)2 because
R: Ba(OH)2 is soluble in water
Chemistry-General
Maths-
The mean of following frequency table is 50.
The missing frequencies are
The mean of following frequency table is 50.
The missing frequencies are
Maths-General
Maths-
If the mean deviation of number 1, 1 + d, 1 + 2d, …, 1 + 100d from their mean is 255, then d is equal to
If the mean deviation of number 1, 1 + d, 1 + 2d, …, 1 + 100d from their mean is 255, then d is equal to
Maths-General
Maths-
The locus of 
which lies in shaded region (excluding the boundaries) is best represented by
The locus of which lies in shaded region (excluding the boundaries) is best represented by
Maths-General
Physics-
A bar magnet of length 3 cm has points A and B along its axis at distances of 24 cm and 48 cm on the opposite sides. Ratio of magnetic fields at these points will be
A bar magnet of length 3 cm has points A and B along its axis at distances of 24 cm and 48 cm on the opposite sides. Ratio of magnetic fields at these points will be
Physics-General
Physics-
Two equal bar magnets are kept as shown in the figure. The direction of resultant magnetic field, indicated by arrow head at the point P is (approximately)
Two equal bar magnets are kept as shown in the figure. The direction of resultant magnetic field, indicated by arrow head at the point P is (approximately)
Physics-General
Physics-
The figure below shows the north and south poles of a permanent magnet in which n turn coil of area of cross-section A is resting, such that for a current i passed through the coil, the plane of the coil makes an angle 
with respect to the direction of magnetic field B. If the plane of the magnetic field and the coil are horizontal and vertical respectively, the torque on the coil will be
The figure below shows the north and south poles of a permanent magnet in which n turn coil of area of cross-section A is resting, such that for a current i passed through the coil, the plane of the coil makes an angle with respect to the direction of magnetic field B. If the plane of the magnetic field and the coil are horizontal and vertical respectively, the torque on the coil will be
Physics-General
Physics-
A uniform magnetic field, parallel to the plane of the paper existed in space initially directed from left to right. When a bar of soft iron is placed in the field parallel to it, the lines of force passing through it will be represented by
A uniform magnetic field, parallel to the plane of the paper existed in space initially directed from left to right. When a bar of soft iron is placed in the field parallel to it, the lines of force passing through it will be represented by
Physics-General
Physics-
The square loop ABCD, carrying a current i, is placed in uniform magnetic field B, as shown. The loop can rotate about the axis XX'. The plane of the loop makes and angle ( < 90°) with the direction of B. Through what angle will the loop rotate by itself before the torque on it becomes zero
The square loop ABCD, carrying a current i, is placed in uniform magnetic field B, as shown. The loop can rotate about the axis XX'. The plane of the loop makes and angle ( < 90°) with the direction of B. Through what angle will the loop rotate by itself before the torque on it becomes zero
Physics-General
Physics-
Following figure shows the path of an electron that passes through two regions containing uniform magnetic fields of magnitudes B1 and B2. It's path in each region is a half circle, choose the correct option
Following figure shows the path of an electron that passes through two regions containing uniform magnetic fields of magnitudes B1 and B2. It's path in each region is a half circle, choose the correct option
Physics-General
Physics-
A square loop of side a hangs from an insulating hanger of spring balance. The magnetic field of strength B occurs only at the lower edge. It carries a current I. Find the change in the reading of the spring balance if the direction of current is reversed
A square loop of side a hangs from an insulating hanger of spring balance. The magnetic field of strength B occurs only at the lower edge. It carries a current I. Find the change in the reading of the spring balance if the direction of current is reversed
Physics-General
Physics-
Find magnetic field at O
Find magnetic field at O
Physics-General
Physics-
Two circular coils X and Y, having equal number of turns, carry equal currents in the same sense and subtend same solid angle at point O. If the smaller coil, X is midway between O and Y, then if we represent the magnetic induction due to bigger coil Y at O as BY and that due to smaller coil X at O as BX , then
Two circular coils X and Y, having equal number of turns, carry equal currents in the same sense and subtend same solid angle at point O. If the smaller coil, X is midway between O and Y, then if we represent the magnetic induction due to bigger coil Y at O as BY and that due to smaller coil X at O as BX , then
Physics-General
